1
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Cavallo V, Roggero A, Fina A, Gerard JF, Pruvost S. P(MMA-co-MAA)/cellulose nanofibers composites: Effect of hydrogen bonds on molecular mobility. Carbohydr Polym 2024; 346:122579. [PMID: 39245480 DOI: 10.1016/j.carbpol.2024.122579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2024] [Revised: 07/24/2024] [Accepted: 08/02/2024] [Indexed: 09/10/2024]
Abstract
Cellulose nanofibers (CNFs) nanocomposites were prepared using poly(methylmethacrylate-co-methacrylic acid) (PMMA-co-MAA) to investigate the macromolecular mobility within the composite, with particular focus on the effect of H-bonding. Dynamic mechanical analysis (DMA) and broadband dielectric spectroscopy (BDS) were used to fully characterize the molecular mobility for which the effect of the introduction of H-bond forming moieties and the addition of CNFs (5 and 15 wt%) were assessed. Despite similar Tg values (determined by Differential Scanning Calorimetry), a deeper analysis of the relaxation times associated with the α-relaxation evidenced a significant effect induced by CNFs, which is in fact slowing down the macromolecular relaxation processes. The activation energy of the β-relaxation remained unchanged despite the introduction of MAA units in the main chain and the successive addition of CNFs. However, the latter led to the appearance at low frequencies of a new β'-relaxation correlated with the interactions between the CNF surface -OH groups and the -COOH groups of the matrix. The γ-relaxation showed a 45 % increase in activation energy from PMMA to PMMA-co-MAA + CNF nanocomposites regardless of the CNF content, due to the possibility of CNFs to interact and hinder the motion of the main chain methyl groups in α position.
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Affiliation(s)
- Valentina Cavallo
- Université de Lyon, CNRS, Université Claude Bernard Lyon 1, INSA Lyon, Université Jean Monnet, UMR 5223, Ingénierie des Matériaux Polymères, CEDEX, F-69621 Villeurbanne, France; Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, V.le Teresa Michel, 5, 15121 Alessandria, Italy
| | - Aurélien Roggero
- Université de Lyon, CNRS, Université Claude Bernard Lyon 1, INSA Lyon, Université Jean Monnet, UMR 5223, Ingénierie des Matériaux Polymères, CEDEX, F-69621 Villeurbanne, France
| | - Alberto Fina
- Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, V.le Teresa Michel, 5, 15121 Alessandria, Italy
| | - Jean-François Gerard
- Université de Lyon, CNRS, Université Claude Bernard Lyon 1, INSA Lyon, Université Jean Monnet, UMR 5223, Ingénierie des Matériaux Polymères, CEDEX, F-69621 Villeurbanne, France
| | - Sébastien Pruvost
- Université de Lyon, CNRS, Université Claude Bernard Lyon 1, INSA Lyon, Université Jean Monnet, UMR 5223, Ingénierie des Matériaux Polymères, CEDEX, F-69621 Villeurbanne, France.
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2
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DARVISHI S, ŞENSES E. Polymer architecture effect on rheology and segmental dynamics in poly (methyl methacrylate)-silica nanocomposite melts. Turk J Chem 2023; 47:749-762. [PMID: 38174057 PMCID: PMC10760588 DOI: 10.55730/1300-0527.3576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 08/25/2023] [Accepted: 06/23/2023] [Indexed: 01/05/2024] Open
Abstract
Architecturally different polymer chains lead to fundamentally different rheological responses and internal dynamics, which can be utilized to rationalize advanced thermoplastic nanocomposites with tunable mechanical behavior. In this work, three model poly (methyl methacrylate) (PMMA) polymers with linear, bottlebrush, and star architectures with the same total molar mass were investigated in their neat form, and nanocomposites with well-dispersed silica nanoparticles using rheology and broadband dielectric spectroscopy (BDS). The master curves of the dynamic moduli obtained by time-temperature superposition (TTS) over the entire range from the Rouse regime to the terminal flow and a sequence of significantly different relaxation modes were observed for the samples with linear and branch chains. While linear chains form an entangled polymer network, the branched bottlebrush, and star chains show a viscoelastic response with no sign of rubbery entanglement plateau and a weak arm relaxation regime between Rouse and terminal flow, akin to other branched polymers. Moreover, branched chains showed a higher fragility index (m = 3.46 for the bottlebrush and 5.36 for the star) compared to linear chains (m = 3.29) due to dynamical heterogeneities induced by arm relaxation. The addition of nanoparticles affects only the terminal relaxation regime, where the whole chain motion is hindered by the attractive nanoparticles. The dynamics of the polymer segment were investigated by performing broadband dielectric spectroscopy (BDS) at a frequency range from 10-2 Hz to 107 Hz. The results revealed more than 10 times slower segmental relaxation for the star homopolymers and a slowdown in the α-relaxation process for all three architectures in their composite form. The dynamical slowdown in the composites is temperature dependent and more pronounced at low temperatures (leading to approximately equal to 80 times slower dynamics for nanocomposite with bottlebrush PMMA at 150 °C) due to prolonged relaxation of the interfacial polymer compared to the matrix chains. The results from this study have practical applications in fields such as gas separation and polymeric electrolyte membranes, where simultaneous improvement of segmental mobility and mechanical moduli is highly desired.
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Affiliation(s)
- Saeid DARVISHI
- Department of Chemical and Biological Engineering, Koç University, İstanbul,
Turkiye
| | - Erkan ŞENSES
- Department of Chemical and Biological Engineering, Koç University, İstanbul,
Turkiye
- Koç University Boron and Advanced Materials Application and Research Center (KUBAM), İstanbul,
Turkiye
- n2STAR-Koç University Nanofabrication and Nanocharacterization Center for Scientific and Technological Advanced Research, İstanbul,
Turkiye
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3
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Soman B, Schweizer KS, Evans CM. Fragile Glass Formation and Non-Arrhenius Upturns in Ethylene Vitrimers Revealed by Dielectric Spectroscopy. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Bhaskar Soman
- Department of Materials Science and Engineering, University of Illinois, Urbana-Champaign, Urbana, Illinois61801, United States
| | - Kenneth S. Schweizer
- Department of Materials Science and Engineering, University of Illinois, Urbana-Champaign, Urbana, Illinois61801, United States
| | - Christopher M. Evans
- Department of Materials Science and Engineering, University of Illinois, Urbana-Champaign, Urbana, Illinois61801, United States
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4
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Shi G, Geng X, Liu Y, Wu G. Nanophase Separation-Induced Anomalous Enthalpy Hysteresis in Poly( n-alkyl methacrylate)s. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00983] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gaopeng Shi
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Xiaoning Geng
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yuanbiao Liu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Guozhang Wu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
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5
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TSDC and DSC investigation on the molecular mobility in the amorphous solid state and in the glass transformation region of two benzodiazepine derivatives: diazepam and nordazepam. J Pharm Sci 2022; 111:2239-2248. [DOI: 10.1016/j.xphs.2022.02.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 02/22/2022] [Accepted: 02/22/2022] [Indexed: 11/22/2022]
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6
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Liu Y, Shi G, Wu G. Tuning the dynamic fragility of acrylic polymers by small molecules: the interplay of molecular structures. SOFT MATTER 2021; 17:7541-7553. [PMID: 34328486 DOI: 10.1039/d1sm00758k] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
This report studied changes in the dynamic fragility (m) of poly(butyl methacrylate) (PBMA) by introducing guest hindered phenols capable of forming two or three intermolecular hydrogen bonds (inter-HBs) per molecule with the host polymer. The small molecules effectively decrease the m value, even if they apparently increase the glass transition temperature (Tg) of mixtures. The reduction in m was confirmed by enthalpy relaxation in two aspects: adding the guest molecule leads to a stronger cooling rate dependence of the limiting fictive temperature together with an apparent increase in aging rate of PBMA hybrids at low concentrations. By varying the molecule size and steric hindrance of the hydroxyl group on the hindered phenols, we clarified that m is primarily governed by the strength of inter-HB interactions, while the Tg value of mixtures depends on a combined effect of additive bulkiness and HB interaction. The anomalous dynamics was further rationalized not only by the HB-induced flexibility balance between side groups and backbone, but also by the reduction of cooperative rearranging sizes and alleviation of long-chain connectivity in such HB-driven hybrids.
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Affiliation(s)
- Yuanbiao Liu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, Shanghai 200237, China.
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7
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Ghorbel N, Raihane M, Lahcini M, Kallel A. Interfacial characteristics of poly(ε‐caprolactone)‐
grafted
‐halloysites nanotubes bionanocomposites. POLYM ENG SCI 2021. [DOI: 10.1002/pen.25583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Mustapha Raihane
- IMED‐Lab, Faculty of Sciences and Techniques Cadi Ayyad University Marrakech Morocco
| | - Mohammed Lahcini
- IMED‐Lab, Faculty of Sciences and Techniques Cadi Ayyad University Marrakech Morocco
- Mohammed VI Polytechnic University Ben Guerir Morocco
| | - Ali Kallel
- LaMaCOP, Faculty of sciences of Sfax Sfax Tunisia
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8
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Arbe A, Alvarez F, Colmenero J. Insight into the Structure and Dynamics of Polymers by Neutron Scattering Combined with Atomistic Molecular Dynamics Simulations. Polymers (Basel) 2020; 12:E3067. [PMID: 33371357 PMCID: PMC7767341 DOI: 10.3390/polym12123067] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 12/04/2020] [Accepted: 12/11/2020] [Indexed: 11/23/2022] Open
Abstract
Combining neutron scattering and fully atomistic molecular dynamics simulations allows unraveling structural and dynamical features of polymer melts at different length scales, mainly in the intermolecular and monomeric range. Here we present the methodology developed by us and the results of its application during the last years in a variety of polymers. This methodology is based on two pillars: (i) both techniques cover approximately the same length and time scales and (ii) the classical van Hove formalism allows easily calculating the magnitudes measured by neutron scattering from the simulated atomic trajectories. By direct comparison with experimental results, the simulated cell is validated. Thereafter, the information of the simulations can be exploited, calculating magnitudes that are experimentally inaccessible or extending the parameters range beyond the experimental capabilities. We show how detailed microscopic insight on structural features and dynamical processes of various kinds has been gained in polymeric systems with different degrees of complexity, and how intriguing questions as the collective behavior at intermediate length scales have been faced.
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Affiliation(s)
- Arantxa Arbe
- Centro de Física de Materiales (CSIC, UPV/EHU) and Materials Physics Center MPC, Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain; (A.A.); (F.A.)
| | - Fernando Alvarez
- Centro de Física de Materiales (CSIC, UPV/EHU) and Materials Physics Center MPC, Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain; (A.A.); (F.A.)
- Departamento de Polímeros y Materiales Avanzados, Física, Química y Tecnología (UPV/EHU), Apartado 1072, E-20080 San Sebastián, Spain
| | - Juan Colmenero
- Centro de Física de Materiales (CSIC, UPV/EHU) and Materials Physics Center MPC, Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain; (A.A.); (F.A.)
- Departamento de Polímeros y Materiales Avanzados, Física, Química y Tecnología (UPV/EHU), Apartado 1072, E-20080 San Sebastián, Spain
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, E-20018 San Sebastián, Spain
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9
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Hayashi M, Kimura T, Oba Y, Takasu A. One‐Pot Synthesis of Dual Supramolecular Associative PMMA‐Based Copolymers and the Precise Thermal Property Tuning. MACROMOL CHEM PHYS 2020. [DOI: 10.1002/macp.202000302] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Mikihiro Hayashi
- Department of Life Science and Applied Chemistry Graduated School of Engineering Nagoya Institute of Technology Gokiso‐cho, Showa‐ku Nagoya Aichi 466‐8555 Japan
| | - Takahiro Kimura
- Department of Life Science and Applied Chemistry Graduated School of Engineering Nagoya Institute of Technology Gokiso‐cho, Showa‐ku Nagoya Aichi 466‐8555 Japan
| | - Yuta Oba
- Department of Life Science and Applied Chemistry Graduated School of Engineering Nagoya Institute of Technology Gokiso‐cho, Showa‐ku Nagoya Aichi 466‐8555 Japan
| | - Akinori Takasu
- Department of Life Science and Applied Chemistry Graduated School of Engineering Nagoya Institute of Technology Gokiso‐cho, Showa‐ku Nagoya Aichi 466‐8555 Japan
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10
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Interfacial phenomena and molecular dynamics in core-shell-type nanocomposites based on polydimethylsiloxane and fumed silica: Comparison between impregnation and the new mechano-sorption modification as preparation methods. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122876] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Kolmangadi MA, Szymoniak P, Smales GJ, Alentiev DA, Bermeshev M, Böhning M, Schönhals A. Molecular Dynamics of Janus Polynorbornenes: Glass Transitions and Nanophase Separation. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01450] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Mohamed A. Kolmangadi
- Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
| | - Paulina Szymoniak
- Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
| | - Glen J. Smales
- Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
| | - Dmitry A. Alentiev
- A.V. Topchiev Institute of Petrochemical Synthesis of Russian Academy of Science, Leninskii prospect, 29, 119991 Moscow, Russia
| | - Maxim Bermeshev
- A.V. Topchiev Institute of Petrochemical Synthesis of Russian Academy of Science, Leninskii prospect, 29, 119991 Moscow, Russia
| | - Martin Böhning
- Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
| | - Andreas Schönhals
- Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
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12
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Kritikos G. Exploring a unified description of the super-Arrhenius region above and below the glass transition temperature. SOFT MATTER 2020; 16:6902-6913. [PMID: 32647837 DOI: 10.1039/d0sm00539h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A new approach is presented in order to check whether the hypothesis of an Arrhenius component surviving in the α-relaxation region is consistent with experimental data. The temperature dependence of the dynamics in the whole glassy regime is described by an equation which assumes an Arrhenius component in the cooperative diffusion. Based on thermodynamic arguments, the dynamic heterogeneities close to the glass transition region are related to structural heterogeneities in a manner consistent with the idea of a sigmoidal shape in the cohesion energy. By doing so, a characteristic temperature which can be identified as the glass transition temperature (Tg) emerges, while an additional parameter for the extension of the super-Arrhenius region is introduced. In the analysis of experimental data, the activation energy parameter, determined from the temperature dependence of the β-relaxation, is fixed, and the relation between the experimental and the predicted glass transition temperature is examined. The results of this comparison support the idea that dynamics above and below Tg can be described in a unified manner. The proposed model is tested against experimental data of glass-forming liquids, polymers and polymer composites. In the latter systems, it is shown that the Arrhenius-like behavior characterizing the dynamics of the polymeric bound-layer can be accounted for by such an extension of the super-Arrhenius region.
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Affiliation(s)
- Georgios Kritikos
- Laboratory of Physical Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
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13
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Mapesa EU, Street DP, Heres MF, Kilbey SM, Sangoro J. Wetting and Chain Packing across Interfacial Zones Affect Distribution of Relaxations in Polymer and Polymer-Grafted Nanocomposites. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00399] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Emmanuel U. Mapesa
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Dayton P. Street
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Maximilian F. Heres
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - S. Michael Kilbey
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Joshua Sangoro
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
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14
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Shi G, Liu Y, Wu G. βfast Relaxation Governs the Damping Stability of Acrylic Polymer/Hindered Phenol Hybrids. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00255] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gaopeng Shi
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai 200237, China
| | - Yuanbiao Liu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai 200237, China
| | - Guozhang Wu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai 200237, China
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15
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Clark AG, Salcedo Montero M, Govinna ND, Lounder SJ, Asatekin A, Cebe P. Relaxation dynamics of blends of
PVDF
and zwitterionic copolymer by dielectric relaxation spectroscopy. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20200032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Andrew G. Clark
- Department of Physics and AstronomyTufts University Medford Massachusetts USA
| | - Miriam Salcedo Montero
- Department of Physics and AstronomyTufts University Medford Massachusetts USA
- Facultad de CienciasUniversidad de Autónoma de Madrid Madrid Spain
| | - Nelaka D. Govinna
- Department of Physics and AstronomyTufts University Medford Massachusetts USA
| | - Samuel J. Lounder
- Department of Chemical and Biological EngineeringTufts University Medford Massachusetts USA
| | - Ayse Asatekin
- Department of Chemical and Biological EngineeringTufts University Medford Massachusetts USA
| | - Peggy Cebe
- Department of Physics and AstronomyTufts University Medford Massachusetts USA
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16
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Ni Y, Song H, Wilcox DA, Medvedev GA, Boudouris BW, Caruthers JM. Rethinking the Analysis of the Linear Viscoelastic Behavior of an Epoxy Polymer near and above the Glass Transition. Macromolecules 2020. [DOI: 10.1021/acs.macromol.9b02634] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yelin Ni
- Davidson School of Chemical Engineering; Forney Hall of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, Indiana 47907-2100, United States
| | - Hosup Song
- Davidson School of Chemical Engineering; Forney Hall of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, Indiana 47907-2100, United States
| | - Daniel A. Wilcox
- Davidson School of Chemical Engineering; Forney Hall of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, Indiana 47907-2100, United States
| | - Grigori A. Medvedev
- Davidson School of Chemical Engineering; Forney Hall of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, Indiana 47907-2100, United States
| | - Bryan W. Boudouris
- Davidson School of Chemical Engineering; Forney Hall of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, Indiana 47907-2100, United States
| | - James M. Caruthers
- Davidson School of Chemical Engineering; Forney Hall of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, Indiana 47907-2100, United States
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17
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Nikonorova NA, Kononov AA, Polotskaya GA, Castro RA. Dielectric Relaxation of Nanocomposites Based on Poly(phenylene oxide) and Endometallofullerene. POLYMER SCIENCE SERIES A 2020. [DOI: 10.1134/s0965545x20020029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Study on the effect of side-chain group on the segmental dynamics of selected methacrylate polymers at ambient and high pressures. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.121860] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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19
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The Location-influenced Fluorescence of AIEgens in the Microphase-separated Structures. CHINESE JOURNAL OF POLYMER SCIENCE 2019. [DOI: 10.1007/s10118-019-2333-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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20
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Liu X, Abel BA, Zhao Q, Li S, Choudhury S, Zheng J, Archer LA. Microscopic Origins of Caging and Equilibration of Self-Suspended Hairy Nanoparticles. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01473] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Karatza A, Klonos P, Pispas S, Kyritsis A. Glass transition and molecular dynamics in PHPMA-b-POEGMA block copolymers. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.121794] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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22
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Relaxation behavior of random copolymers containing rigid fumarate and flexible acrylate segments by dynamic mechanical analysis. Polym J 2019. [DOI: 10.1038/s41428-019-0226-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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23
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Bonardd S, Alegria A, Saldias C, Leiva A, Kortaberria G. Polyitaconates: A New Family of "All-Polymer" Dielectrics. ACS APPLIED MATERIALS & INTERFACES 2018; 10:38476-38492. [PMID: 30346120 DOI: 10.1021/acsami.8b14636] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This work presents the synthesis of new poly(itaconate)s containing sulfone or nitrile pendant groups through conventional radical polymerization together with their characterization and comparison with poly(methacrylate)s containing identical groups. Structural and thermal characterization has been carried out in terms of Fourier transform infrared spectroscopy, differential scanning calorimetry, nuclear magnetic resonance, and thermogravimetric analysis. Characterized by broad band dielectric spectroscopy (BDS), all polymers showed dielectric constant values between 7 and 10 (at 25 °C and 1 kHz) and relative low dielectric loss values (≈0.02). BDS measurements showed, for all the polymers analyzed, notorious subglass transitions even at temperatures below -100 °C, resulting in a broad temperature interval in which these polymers exhibit high dielectric constant and could work without high losses. Therefore, these materials seem to be good candidates for dielectric applications such as energy storage, among others.
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Affiliation(s)
- Sebastian Bonardd
- Departamento de Química Física, Facultad de Química , Pontificia Universidad Católica de Chile , Casilla 302, Correo 22 , Santiago 7820436 , Chile
- "Materials + Technologies" Group, Departamento Ingeniería Química y Medio Ambiente, Escuela Univ Politécnica , Universidad País Vasco/Euskal Herriko Unibertsitatea , Pza Europa 1 , 20018 . Donostia-San Sebastián , Spain
| | - Angel Alegria
- Materials Physics Center, CSIC-UPV/EHU , Paseo Manuel Lardizábal 5 , San Sebastian 20018 , Spain
- Departamento Física de Materiales , Universidad del País Vasco , Paseo Manuel Lardizábal 3 , San Sebastian 20018 , Spain
| | - Cesar Saldias
- Departamento de Química Física, Facultad de Química , Pontificia Universidad Católica de Chile , Casilla 302, Correo 22 , Santiago 7820436 , Chile
| | - Angel Leiva
- Departamento de Química Física, Facultad de Química , Pontificia Universidad Católica de Chile , Casilla 302, Correo 22 , Santiago 7820436 , Chile
| | - Galder Kortaberria
- "Materials + Technologies" Group, Departamento Ingeniería Química y Medio Ambiente, Escuela Univ Politécnica , Universidad País Vasco/Euskal Herriko Unibertsitatea , Pza Europa 1 , 20018 . Donostia-San Sebastián , Spain
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24
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Liu W, Zhang L. Mechanisms of the Complex Thermo-Mechanical Behavior of Polymer Glass Across a Wide Range of Temperature Variations. Polymers (Basel) 2018; 10:E1153. [PMID: 30961079 PMCID: PMC6403929 DOI: 10.3390/polym10101153] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 10/13/2018] [Accepted: 10/15/2018] [Indexed: 11/25/2022] Open
Abstract
This paper aims to explore the mechanisms of the complex thermo-mechanical behavior of polymer glass across a wide range of temperature variations. To this end, the free vibration frequency spectrum of simply supported poly(methyl methacrylate) (PMMA) beams was thoroughly investigated with the aid of the impulse excitation technique. It was found that the amplitude ratio of the multiple peaks in the frequency spectrum is a strongly dependent on temperature, and that the peaks correspond to the multiple vibrational modes of the molecular network of PMMA. At a low temperature, the vibration is dominated by the overall microstructure of PMMA. With increasing the temperature, however, the contribution of the sub-microstructures is retarded by β relaxation. Above 80 °C, the vibration is fully dominated by the microstructure after relaxation. The relaxation time at the transition temperature is of the same order of the vibration period, confirming the contribution of β relaxation. These findings provide a precise method for establishing reliable physical-based constitutive models of polymer glass.
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Affiliation(s)
- Weidong Liu
- Laboratory for Precision and Nano Processing Technologies, School of Mechanical and Manufacturing Engineering, The University of New South Wales, New South Wales 2052, Australia.
| | - Liangchi Zhang
- Laboratory for Precision and Nano Processing Technologies, School of Mechanical and Manufacturing Engineering, The University of New South Wales, New South Wales 2052, Australia.
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25
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Bulk dynamics of the thermoresponsive random copolymer of di(ethylene glycol) methyl ether methacrylate (MEO2MA) and oligo(ethylene glycol) methyl ether methacrylate (OEGMA). POLYMER 2018. [DOI: 10.1016/j.polymer.2018.06.041] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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26
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Klonos P, Bolbukh Y, Koutsiara C, Zafeiris K, Kalogeri O, Sternik D, Deryło–Marczewska A, Tertykh V, Pissis P. Morphology and molecular dynamics investigation of low molecular weight PDMS adsorbed onto Stöber, fumed, and sol-gel silica nanoparticles. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.06.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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27
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Pötzschner B, Mohamed F, Bächer C, Wagner E, Lichtinger A, Bock D, Kreger K, Schmidt HW, Rössler EA. Non-polymeric asymmetric binary glass-formers. II. Secondary relaxation studied by dielectric, 2H NMR, and 31P NMR spectroscopy. J Chem Phys 2018; 146:164504. [PMID: 28456197 DOI: 10.1063/1.4980085] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We investigate the secondary (β-) relaxations of an asymmetric binary glass former consisting of a spirobichroman derivative (SBC; Tg = 356 K) as the high-Tg component and the low-Tg component tripropyl phosphate (TPP; Tg = 134 K). The main relaxations are studied in Paper I [B. Pötzschner et al., J. Chem. Phys. 146, 164503 (2017)]. A high Tg contrast of ΔTg = 222 K is put into effect in a non-polymeric system. Component-selective studies are carried out by combining results from dielectric spectroscopy (DS) for mass concentrations cTPP ≥ 60% and those from different methods of 2H and 31P NMR spectroscopy. In the case of NMR, the full concentration range (10% ≤ cTPP ≤ 100%) is covered. The neat components exhibit a β-relaxation (β1 (SBC) and β2 (TPP)). The latter is rediscovered by DS in the mixtures for all concentrations with unchanged time constants. NMR spectroscopy identifies the β-relaxations as being alike to those in neat glasses. A spatially highly restricted motion with angular displacement below ±10° encompassing all molecules is involved. In the low temperature range, where TPP shows the typical 31P NMR echo spectra of the β2-process, very similar spectral features are observed for the (deuterated) SBC component by 2H NMR, in addition to its "own" β1-process observed at high temperatures. Apparently, the small TPP molecules enslave the large SBC molecules to perform a common hindered reorientation. The temperature dependence of the spin-lattice relaxation time of both components is the same and reveals an angular displacement of the SBC molecules somewhat smaller than that of TPP, though the time constants τβ2 are the same. Furthermore, T1(T) of TPP in the temperature region of the β2-process is absolutely the same as in the mixture TPP/polystyrene investigated previously. It appears that the manifestations of the β-process introduced by one component are essentially independent of the second component. Finally, at cTPP ≤ 20% one finds indications that the β2-process starts to disintegrate. More and more TPP molecules get immobilized upon decreasing cTPP. We conclude that the β-process is a cooperative process.
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Affiliation(s)
- B Pötzschner
- Experimentalphysik II, University of Bayreuth, 95447 Bayreuth, Germany and Macromolecular Chemistry I, University of Bayreuth, 95447 Bayreuth, Germany
| | - F Mohamed
- Experimentalphysik II, University of Bayreuth, 95447 Bayreuth, Germany and Macromolecular Chemistry I, University of Bayreuth, 95447 Bayreuth, Germany
| | - C Bächer
- Experimentalphysik II, University of Bayreuth, 95447 Bayreuth, Germany and Macromolecular Chemistry I, University of Bayreuth, 95447 Bayreuth, Germany
| | - E Wagner
- Experimentalphysik II, University of Bayreuth, 95447 Bayreuth, Germany and Macromolecular Chemistry I, University of Bayreuth, 95447 Bayreuth, Germany
| | - A Lichtinger
- Experimentalphysik II, University of Bayreuth, 95447 Bayreuth, Germany and Macromolecular Chemistry I, University of Bayreuth, 95447 Bayreuth, Germany
| | - D Bock
- Experimentalphysik II, University of Bayreuth, 95447 Bayreuth, Germany and Macromolecular Chemistry I, University of Bayreuth, 95447 Bayreuth, Germany
| | - K Kreger
- Experimentalphysik II, University of Bayreuth, 95447 Bayreuth, Germany and Macromolecular Chemistry I, University of Bayreuth, 95447 Bayreuth, Germany
| | - H-W Schmidt
- Experimentalphysik II, University of Bayreuth, 95447 Bayreuth, Germany and Macromolecular Chemistry I, University of Bayreuth, 95447 Bayreuth, Germany
| | - E A Rössler
- Experimentalphysik II, University of Bayreuth, 95447 Bayreuth, Germany and Macromolecular Chemistry I, University of Bayreuth, 95447 Bayreuth, Germany
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28
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Sato A, Sasaki T. Cooperativity of dynamics in supercooled polymeric materials and its temperature dependence predicted from a surface controlled model. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2018.01.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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29
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Sharma RP, Green PF. Component Dynamics in Polymer/Polymer Blends: Role of Spatial Compositional Heterogeneity. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00092] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ravi P. Sharma
- Department
of Materials Science and Engineering and ‡Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Peter F. Green
- Department
of Materials Science and Engineering and ‡Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
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30
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Chen Y, Mao J, Zhu Y, Zhang K, Wu G, Wu J, Zhang H. Structure and properties of microwave transparent crosslinked polystyrene prepared through 3D printing bulk polymerization. J Appl Polym Sci 2017. [DOI: 10.1002/app.44865] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yuanwu Chen
- School of Material and Energy; Guangdong University of Technology; Guangdong China
- Department of Mechanical and Aerospace Engineering; the Hong Kong University of Science and Technology; Clear Water Bay Kowloon Hong Kong
| | - Jiale Mao
- Department of Mechanical and Aerospace Engineering; the Hong Kong University of Science and Technology; Clear Water Bay Kowloon Hong Kong
- State Key laboratory of Electrical Insulation and Power Equipment; Xi'an Jiaotong University; Xi'an China
| | - Yejun Zhu
- Department of Mechanical and Aerospace Engineering; the Hong Kong University of Science and Technology; Clear Water Bay Kowloon Hong Kong
| | - Kai Zhang
- Department of Mechanical and Aerospace Engineering; the Hong Kong University of Science and Technology; Clear Water Bay Kowloon Hong Kong
| | - Gangpeng Wu
- Department of Mechanical and Aerospace Engineering; the Hong Kong University of Science and Technology; Clear Water Bay Kowloon Hong Kong
| | - Jingshen Wu
- Department of Mechanical and Aerospace Engineering; the Hong Kong University of Science and Technology; Clear Water Bay Kowloon Hong Kong
| | - Haiyan Zhang
- School of Material and Energy; Guangdong University of Technology; Guangdong China
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31
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Körber T, Mohamed F, Hofmann M, Lichtinger A, Willner L, Rössler EA. The Nature of Secondary Relaxations: The Case of Poly(ethylene-alt-propylene) Studied by Dielectric and Deuteron NMR Spectroscopy. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02536] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thomas Körber
- Experimentalphysik
II, Universität Bayreuth, 95440 Bayreuth, Germany
| | - Fathia Mohamed
- Experimentalphysik
II, Universität Bayreuth, 95440 Bayreuth, Germany
| | - Marius Hofmann
- Experimentalphysik
II, Universität Bayreuth, 95440 Bayreuth, Germany
| | - Anne Lichtinger
- Experimentalphysik
II, Universität Bayreuth, 95440 Bayreuth, Germany
| | - Lutz Willner
- Institute
of Complex Systems, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - Ernst A. Rössler
- Experimentalphysik
II, Universität Bayreuth, 95440 Bayreuth, Germany
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32
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Zajac M, Kahl H, Schade B, Rödel T, Dionisio M, Beiner M. Relaxation behavior of polyurethane networks with different composition and crosslinking density. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.01.032] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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33
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Hirata T, Matsuno H, Kawaguchi D, Inutsuka M, Hirai T, Tanaka M, Tanaka K. Dynamics of a bioinert polymer in hydrated states by dielectric relaxation spectroscopy. Phys Chem Chem Phys 2017; 19:1389-1394. [DOI: 10.1039/c6cp07322k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The segmental dynamics of poly(2-methoxyethyl acrylate) at the water interface is extremely faster and comparable to the side chain motion.
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Affiliation(s)
- Toyoaki Hirata
- Department of Applied Chemistry
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Hisao Matsuno
- Department of Applied Chemistry
- Kyushu University
- Fukuoka 819-0395
- Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)
| | - Daisuke Kawaguchi
- Education Center for Global Leaders in Molecular Systems for Devices
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Manabu Inutsuka
- Department of Applied Chemistry
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Tomoyasu Hirai
- Department of Applied Chemistry
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Masaru Tanaka
- Institute for Materials Chemistry and Engineering
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Keiji Tanaka
- Department of Applied Chemistry
- Kyushu University
- Fukuoka 819-0395
- Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)
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34
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Lin Y, Liu L, Zhang D, Liu Y, Guan A, Wu G. Unexpected segmental dynamics in polystyrene-grafted silica nanocomposites. SOFT MATTER 2016; 12:8542-8553. [PMID: 27722506 DOI: 10.1039/c6sm01321j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Establishing the relationship between interfacial layer chain packing and dynamics remains a continuing challenge in polymer nanocomposites (PNCs). This issue is expected to be significant in our understanding of the mechanism of the dynamic response of such materials and the manner in which these parameters affect the macroscopic properties of PNCs. In this study, we report the dynamics of free polystyrene (PS) and poly(methyl methacrylate) (PMMA) matrix chains, as well as those of polymer chains surrounding the spherical silica nanoparticles (NPs) where silica NPs are either bare or PS grafted, to discriminate the role of grafted chains and interfacial interactions between grafted NPs and the matrix. The α-relaxation dynamics of the PS matrix is unaffected by silica NP loadings, it slows down in PMMA nanocomposites because of polymer-NP interfacial interactions and steric hindrance. More interestingly, we probe the enhanced mobility of the interfacial layer (α'-relaxation) in PNCs filled with grafted NPs, and this phenomenon is further corroborated by the accelerated Maxwell-Wagner-Sillars polarization process in the presence of grafted silica NPs. Moreover, the α'-relaxation time in the vicinity of glass transition temperature of the polymer matrix unexpectedly increases with increasing temperature. Such an anomalous temperature-dependent behavior can be attributed to the influence exerted by slow α-relaxation dynamics. Considering these phenomena and the mechanical properties, we propose a three-layer model to explain the observed behavior of grafted silica NP-filled nanocomposites. These findings provide new insight into the mechanisms responsible for mechanical reinforcement and therefore provide guidance in designing PNCs with tunable macroscopic properties.
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Affiliation(s)
- Yu Lin
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Langping Liu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Dongge Zhang
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Yuanbiao Liu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Aiguo Guan
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Guozhang Wu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
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35
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Agrawal A, Wenning BM, Choudhury S, Archer LA. Interactions, Structure, and Dynamics of Polymer-Tethered Nanoparticle Blends. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:8698-8708. [PMID: 27479587 DOI: 10.1021/acs.langmuir.6b01814] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report on the structure, jamming, and dynamics of blends of self-suspended hairy silica nanoparticles grafted with poly(ethylene glycol) (PEG) and poly(methyl methacrylate) (PMMA). We find that favorable enthalpic attraction between tethered PEG and PMMA chains augment previously reported entropic attractions between tethered polymer chains in self-suspended suspensions to enhance particle-particle correlations, increase jamming, and slow down chain dynamics. As with their single-component counterparts, the hairy SiO2-PEG/SiO2-PMMA nanoparticle blends exhibit soft glassy rheological behavior and both the energy dissipated at yielding and the plateau elastic modulus display strong maxima in the symmetric case. A comparison of the small angle X-ray scattering (SAXS) measurements with theoretical analysis from density functional theory (DFT) reveals that the addition of SiO2-PMMA to a self-suspended SiO2-PEG suspension initially leads to a higher degree of stretching of the corona chains, which produces stronger interdigitation of the tethered chains, enhanced jamming, and slower polymer relaxation than observed in the single-component materials. By means of an analysis of the heat of mixing released upon blending tethered and untethered PEG and PMMA chains, we find that the strong enthalpic attraction between the grafted polymer chains enhances entropic attractive forces produced by the space-filling constraint on tethered ligands in self-suspended suspensions to produce entangled-polymer-like physical properties in polymers with molecular weights below the thresholds normally associated with the transition to an entangled state.
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Affiliation(s)
- Akanksha Agrawal
- Robert Frederick Smith School of Chemical and Biomolecular Engineering and ‡Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14853, United States
| | - Brandon M Wenning
- Robert Frederick Smith School of Chemical and Biomolecular Engineering and ‡Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14853, United States
| | - Snehashis Choudhury
- Robert Frederick Smith School of Chemical and Biomolecular Engineering and ‡Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14853, United States
| | - Lynden A Archer
- Robert Frederick Smith School of Chemical and Biomolecular Engineering and ‡Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14853, United States
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36
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Bharati A, Wübbenhorst M, Moldenaers P, Cardinaels R. Effect of Compatibilization on Interfacial Polarization and Intrinsic Length Scales in Biphasic Polymer Blends of PαMSAN and PMMA: A Combined Experimental and Modeling Dielectric Study. Macromolecules 2016. [DOI: 10.1021/acs.macromol.5b02326] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Avanish Bharati
- Soft
Matter Rheology and Technology, Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, P.B. 2424, B-3001 Leuven, Belgium
| | - Michael Wübbenhorst
- Soft
Matter and Biophysics Section, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, P.B. 2416, B-3001 Leuven, Belgium
| | - Paula Moldenaers
- Soft
Matter Rheology and Technology, Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, P.B. 2424, B-3001 Leuven, Belgium
| | - Ruth Cardinaels
- Soft
Matter Rheology and Technology, Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, P.B. 2424, B-3001 Leuven, Belgium
- Polymer
Technology, Department of Mechanical Engineering, TU Eindhoven, P.B. 513, 5600 MB Eindhoven, The Netherlands
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37
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Zhang L, Qiu B, Song Y, Zheng Q. Molecular relaxation and dynamic rheology of “cluster phase”-free ionomers based on lanthanum(iii)-neutralized low-carboxylated poly(methyl methacrylate). RSC Adv 2016. [DOI: 10.1039/c6ra10135f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
La(iii)-neutralized low-carboxylated poly(methyl methacrylate)-based ionomers free of cluster phase exhibit a fluid-to-solid transition assigned to an interconnected multiplets network.
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Affiliation(s)
- Lina Zhang
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou 310027
- China
| | - Biwei Qiu
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou 310027
- China
| | - Yihu Song
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou 310027
- China
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
| | - Qiang Zheng
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou 310027
- China
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
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38
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Liu C, Liu Z, Yin X, Wu G. Tuning the Dynamic Fragility of Acrylic Polymers by Small Molecules: The Interplay of Hydrogen Bonding Strength. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00489] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Chongyang Liu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, 130 Meilong Rd., Shanghai 200237, China
| | - Zhiyuan Liu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, 130 Meilong Rd., Shanghai 200237, China
| | - Xiaotong Yin
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, 130 Meilong Rd., Shanghai 200237, China
| | - Guozhang Wu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, 130 Meilong Rd., Shanghai 200237, China
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39
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Yin X, Liu C, Lin Y, Guan A, Wu G. Influence of hydrogen bonding interaction on the damping properties of poly(n-butyl methacrylate)/small molecule hybrids. J Appl Polym Sci 2015. [DOI: 10.1002/app.41954] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Xiaotong Yin
- Shanghai Key Laboratory of Advanced Polymeric Materials; School of Materials Science & Engineering; East China University of Science & Technology; Shanghai 200237 People's Republic of China
| | - Chongyang Liu
- Shanghai Key Laboratory of Advanced Polymeric Materials; School of Materials Science & Engineering; East China University of Science & Technology; Shanghai 200237 People's Republic of China
| | - Yu Lin
- Shanghai Key Laboratory of Advanced Polymeric Materials; School of Materials Science & Engineering; East China University of Science & Technology; Shanghai 200237 People's Republic of China
| | - Aiguo Guan
- Shanghai Key Laboratory of Advanced Polymeric Materials; School of Materials Science & Engineering; East China University of Science & Technology; Shanghai 200237 People's Republic of China
| | - Guozhang Wu
- Shanghai Key Laboratory of Advanced Polymeric Materials; School of Materials Science & Engineering; East China University of Science & Technology; Shanghai 200237 People's Republic of China
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40
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Wu X, Liu CS, Ngai KL. Origin of the crossover in dynamics of the sub-Rouse modes at the same temperature as the structural α-relaxation in polymers. SOFT MATTER 2014; 10:9324-9333. [PMID: 25341184 DOI: 10.1039/c4sm01658k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The nature of the liquid-glass transition remains an unsolved fundamental problem. One aspect is the striking change in dynamics of the structural α-relaxation generally observed at a temperature T(B) above Tg in all glass-formers. More intriguing in the case of polymers is that the change of dynamics occurs not only in the structural α-relaxation but also in the sub-Rouse modes, i.e. chain modes in between the α-relaxation and the Rouse modes. However, the nature of the dynamic crossover of the sub-Rouse modes remains unclear. In this paper, the dynamics of a series of poly(n-alkyl methacrylates) with different molecular weights and microstructures studied by mechanical spectroscopy are reported. We demonstrate that the sub-Rouse modes exhibit a similar crossover of dynamics at the same T(B) as the α-relaxation. This property shared by the two viscoelastic mechanisms is remarkable. By invoking the results from the studies using positron annihilation spectroscopy and adiabatic calorimetry, we show that both viscoelastic mechanisms are coupled to density, correlated with the change of the configuration entropy, and are intermolecularly cooperative. The time scale of sub-Rouse modes at T(B) of the polymers studied is approximately independent of molecular weight and micro-structure of the polymers studied. The findings enhance the understanding of the sub-Rouse modes and their manifestation in the viscoelasticity of polymers in the glass-rubber transition region.
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Affiliation(s)
- Xuebang Wu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei, Anhui, People's Republic of China.
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41
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Chua YZ, Schulz G, Shoifet E, Huth H, Zorn R, Scmelzer JWP, Schick C. Glass transition cooperativity from broad band heat capacity spectroscopy. Colloid Polym Sci 2014. [DOI: 10.1007/s00396-014-3280-2] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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42
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Fragiadakis D, Roland CM. Dynamic correlations and heterogeneity in the primary and secondary relaxations of a model molecular liquid. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2014; 89:052304. [PMID: 25353797 DOI: 10.1103/physreve.89.052304] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Indexed: 06/04/2023]
Abstract
Molecular dynamics simulations were carried out on a series of Lennard-Jones binary mixtures of rigid, asymmetric, dumbbell-shaped molecules. Below an onset temperature, the rotational and translational dynamics split into the slow structural α relaxation and a higher-frequency Johari-Goldstein β relaxation. Both processes are dynamically heterogeneous, having broad distributions of relaxation times. However, only the α relaxation shows strong dynamic correlations; correlations at the β time scale are weak, in particular for molecules having shorter bonds. Despite the close connection between the two processes, we find no correlation between the α and β relaxation times of individual molecules; that is, a molecule exhibiting slow β motion does not necessarily undergo slow α dynamics and likewise for fast molecules. However, the single-molecule α relaxation times do correlate with both the α and β relaxation strengths.
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Affiliation(s)
- D Fragiadakis
- Naval Research Laboratory, Chemistry Division, Code 6120, Washington, DC 20375-5342, USA
| | - C M Roland
- Naval Research Laboratory, Chemistry Division, Code 6120, Washington, DC 20375-5342, USA
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43
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Kanaya T, Inoue R, Saito M, Seto M, Yoda Y. Relaxation transition in glass-forming polybutadiene as revealed by nuclear resonance X-ray scattering. J Chem Phys 2014; 140:144906. [DOI: 10.1063/1.4869541] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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44
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Guthausen G, Räntzsch V, Biquet C, Schlabach S, Wilhelm M. Investigation of Polymer-Filler Interactions in TiO2
-Filled Poly(n
-alkyl methacrylates) by Low-Field NMR Relaxometry. MACROMOL CHEM PHYS 2014. [DOI: 10.1002/macp.201400017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Gisela Guthausen
- Institute for Chemical Technology and Polymer Chemistry; Karlsruhe Institute of Technology (KIT); Engesserstraße 18 D-76128 Karlsruhe Germany
| | - Volker Räntzsch
- Institute for Chemical Technology and Polymer Chemistry; Karlsruhe Institute of Technology (KIT); Engesserstraße 18 D-76128 Karlsruhe Germany
| | - Cloé Biquet
- Institute for Chemical Technology and Polymer Chemistry; Karlsruhe Institute of Technology (KIT); Engesserstraße 18 D-76128 Karlsruhe Germany
- Ecole Nationale Superieure di Chemie; F-59652 Villneuve d'Ascq Cedex France
| | - Sabine Schlabach
- Institute for Applied Materials, Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 D-76344 Eggenstein-Leopoldshafen Germany
| | - Manfred Wilhelm
- Institute for Chemical Technology and Polymer Chemistry; Karlsruhe Institute of Technology (KIT); Engesserstraße 18 D-76128 Karlsruhe Germany
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45
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Sun Q, Zhou C, Yue Y, Hu L. A Direct Link between the Fragile-to-Strong Transition and Relaxation in Supercooled Liquids. J Phys Chem Lett 2014; 5:1170-1174. [PMID: 26274466 DOI: 10.1021/jz500239w] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
It is known that both the fragile-to-strong (F-S) transition and relaxation processes occur in numerous supercooled liquids upon cooling toward the glass transition temperature. The key question is whether and how these two dynamic processes are correlated. Here, we show a direct link between the two processes for both metallic glass-forming liquids (MGFLs) with different fragilities and also for nonmetallic glass-forming liquids. By comparing the F-S transition extent parameter f with the parameter r that characterizes the competition between the α and the slow β relaxations, we have discovered a negative exponential connection between the two parameters of supercooled liquids. The finding indicates that the slow β relaxation plays a dominant role in the F-S transition. This work provides new insight into the microscopic mechanism of the F-S transition and creates a strong basis for predicting whether and to what extent the F-S transition occurs in supercooled liquids.
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Affiliation(s)
| | | | - Yuanzheng Yue
- ‡Section of Chemistry, Aalborg University, DK-9000 Aalborg, Denmark
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46
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Grebenkin SY, Syutkin VM. Librations of probe molecules in polymeric matrixes. J Phys Chem B 2014; 118:2568-75. [PMID: 24521212 DOI: 10.1021/jp412476s] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Formation of optical anisotropy under linearly polarized light has been studied in films of poly(n-butyl methacrylate) and poly(n-hexyl methacrylate) doped with azo compound (1-naphthyl-p-azo-methoxybenzene). Time profiles of the absorption anisotropy and absorbance can not be fitted with a commonly used model of anisotropy formation, which includes the transition dipole turns upon cis-trans isomerization and the rotational diffusion: the experimental values of anisotropy happen to be much lower than the calculated ones. To explain the low anisotropy level, fast molecular librations, i.e., stochastic pendulum-like oscillations of azo molecules about their average orientations were introduced. Numerical simulation of anisotropy and absorbance time profiles with the modified model gives estimates for average libration amplitude of 45-60° at temperatures 25-65 K below T(g).
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Affiliation(s)
- S Yu Grebenkin
- Institute of Chemical Kinetics and Combustion, Novosibirsk, 630090, Russian Federation
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47
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Fragiadakis D, Roland CM. Characteristics of the Johari-Goldstein process in rigid asymmetric molecules. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:042307. [PMID: 24229172 DOI: 10.1103/physreve.88.042307] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Indexed: 06/02/2023]
Abstract
Molecular dynamics simulations were carried out on a Lennard-Jones binary mixture of rigid (fixed bond length) diatomic molecules. The translational and rotational correlation functions, and the corresponding susceptibilities, exhibit two relaxation processes: the slow structural relaxation (α dynamics) and a higher frequency secondary relaxation. The latter is a Johari-Goldstein (JG) process, by its definition of involving all parts of the molecule. It shows several properties characteristic of the JG relaxation: (1) merging with the α relaxation at high temperature; (2) a change in temperature dependence of its relaxation strength on vitrification; (3) a separation in frequency from the α peak that correlates with the breadth of the α dispersion; and (4) sensitivity to volume, pressure, and physical aging. These properties can be used to determine whether a secondary relaxation in a real material is an authentic JG process, rather than more trivial motion involving intramolecular degrees of freedom. The latter has no connection to the glass transition, whereas the JG relaxation is closely related to structural relaxation, and thus can provide new insights into the phenomenon.
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Affiliation(s)
- D Fragiadakis
- Naval Research Laboratory, Chemistry Division, Code 6120, Washington, DC 20375-5342, USA
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48
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Casalini R, Roland CM. Density Scaling of the Structural and Johari–Goldstein Secondary Relaxations in Poly(methyl methacrylate). Macromolecules 2013. [DOI: 10.1021/ma401210z] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- R. Casalini
- Naval Research Lab, Chemistry Division, Code 6120,
Washington, D.C. 20375-5342, United States
| | - C. M. Roland
- Naval Research Lab, Chemistry Division, Code 6120,
Washington, D.C. 20375-5342, United States
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49
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Shoifet E, Chua YZ, Huth H, Schick C. High frequency alternating current chip nano calorimeter with laser heating. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:073903. [PMID: 23902080 DOI: 10.1063/1.4812349] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Heat capacity spectroscopy at frequencies up to 100 kHz is commonly performed by thermal effusivity measurements applying the 3ω-technique. Here we show that AC-calorimetry using a thin film chip sensor allows for the measurement of frequency dependent heat capacity in the thin film limit up to about 1 MHz. Using films thinner than the thermal length of the thermal wave (~1 μm) at such frequencies is advantageous because it provides heat capacity alone and not in combination with other quantities like thermal conductivity, at least on a qualitative basis. The used calorimetric sensor and the sample are each less than 1 μm thick. For high frequency AC-calorimetry, high cooling rates at very small temperature differences are required. This is realized by minimizing the heated spot to the size of the on chip thermocouple (3 × 6 μm(2)). A modulated laser beam shaped and positioned by a glass fiber is used as the heat source. The device was used to measure the complex heat capacity in the vicinity of the dynamic glass transition (structural relaxation) of poly(methyl methacrylate). Combining different calorimeters finally provides data between 10(-3) Hz and 10(6) Hz. In this frequency range the dynamic glass transition shifts about 120 K.
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Affiliation(s)
- E Shoifet
- Institute of Physics, University of Rostock, Wismarsche Str. 43-45, 18051 Rostock, Germany
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50
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Blaszczyk-Lezak I, Hernández M, Mijangos C. One Dimensional PMMA Nanofibers from AAO Templates. Evidence of Confinement Effects by Dielectric and Raman Analysis. Macromolecules 2013. [DOI: 10.1021/ma400173q] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Iwona Blaszczyk-Lezak
- Instituto de Ciencia y Tecnología
de Polímeros, CSIC, Juan de la Cierva
3, 28006 Madrid, Spain
| | - Marianella Hernández
- Instituto de Ciencia y Tecnología
de Polímeros, CSIC, Juan de la Cierva
3, 28006 Madrid, Spain
| | - Carmen Mijangos
- Instituto de Ciencia y Tecnología
de Polímeros, CSIC, Juan de la Cierva
3, 28006 Madrid, Spain
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