1
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Novikov VN, Sokolov AP. Temperature Dependence of Structural Relaxation in Glass-Forming Liquids and Polymers. ENTROPY (BASEL, SWITZERLAND) 2022; 24:1101. [PMID: 36010765 PMCID: PMC9407199 DOI: 10.3390/e24081101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 08/05/2022] [Accepted: 08/07/2022] [Indexed: 06/15/2023]
Abstract
Understanding the microscopic mechanism of the transition of glass remains one of the most challenging topics in Condensed Matter Physics. What controls the sharp slowing down of molecular motion upon approaching the glass transition temperature Tg, whether there is an underlying thermodynamic transition at some finite temperature below Tg, what the role of cooperativity and heterogeneity are, and many other questions continue to be topics of active discussions. This review focuses on the mechanisms that control the steepness of the temperature dependence of structural relaxation (fragility) in glass-forming liquids. We present a brief overview of the basic theoretical models and their experimental tests, analyzing their predictions for fragility and emphasizing the successes and failures of the models. Special attention is focused on the connection of fast dynamics on picosecond time scales to the behavior of structural relaxation on much longer time scales. A separate section discusses the specific case of polymeric glass-forming liquids, which usually have extremely high fragility. We emphasize the apparent difference between the glass transitions in polymers and small molecules. We also discuss the possible role of quantum effects in the glass transition of light molecules and highlight the recent discovery of the unusually low fragility of water. At the end, we formulate the major challenges and questions remaining in this field.
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Affiliation(s)
- Vladimir N. Novikov
- Institute of Automation and Electrometry, Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Alexei P. Sokolov
- Department of Chemistry and Joint Institute for Neutron Sciences, University of Tennessee, Knoxville, TN 37996, USA
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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2
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Shen Z, Carrillo JMY, Sumpter BG, Wang Y. Decoding polymer self-dynamics using a two-step approach. Phys Rev E 2022; 106:014502. [PMID: 35974619 DOI: 10.1103/physreve.106.014502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 06/22/2022] [Indexed: 06/15/2023]
Abstract
The self-correlation function and corresponding self-intermediate scattering function in Fourier space are important quantities for describing the molecular motions of liquids. This work draws attention to a largely overlooked issue concerning the analysis of these space-time density-density correlation functions of polymers. We show that the interpretation of non-Gaussian behavior of polymers is generally complicated by intrachain averaging of distinct self-dynamics of different segments. By the very nature of the mathematics involved, the averaging process not only conceals critical dynamical information, but also contributes to the observed non-Gaussian dynamics. To fully expose this issue and provide a thorough benchmark of polymer self-dynamics, we perform analyses of coarse-grained molecular dynamics simulations of linear and ring polymer melts as well as several theoretical models using a "two-step" approach, where interchain and intrachain averagings of segmental self-dynamics are separated. While past investigations primarily focused on the average behavior, our results indicate that a more nuanced approach to polymer self-dynamics is clearly required.
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Affiliation(s)
- Zhiqiang Shen
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Jan-Michael Y Carrillo
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Bobby G Sumpter
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Yangyang Wang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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3
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McKenzie I, Fujimoto D, Karner VL, Li R, MacFarlane WA, McFadden RML, Morris GD, Pearson MR, Raegen AN, Stachura M, Ticknor JO, Forrest JA. A β-NMR study of the depth, temperature, and molecular-weight dependence of secondary dynamics in polystyrene: Entropy–enthalpy compensation and dynamic gradients near the free surface. J Chem Phys 2022; 156:084903. [DOI: 10.1063/5.0081185] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We investigated the depth, temperature, and molecular-weight (MW) dependence of the γ-relaxation in polystyrene glasses using implanted 8Li+ and β-detected nuclear magnetic resonance. Measurements were performed on thin films with MW ranging from 1.1 to 641 kg/mol. The temperature dependence of the average 8Li spin–lattice relaxation time [Formula: see text] was measured near the free surface and in the bulk. Spin–lattice relaxation is caused by phenyl ring flips, which involve transitions between local minima over free-energy barriers with enthalpic and entropic contributions. We used transition state theory to model the temperature dependence of the γ-relaxation, and hence [Formula: see text]. There is no clear correlation of the average entropy of activation [Formula: see text] and enthalpy of activation [Formula: see text] with MW, but there is a clear correlation between [Formula: see text] and [Formula: see text], i.e., entropy–enthalpy compensation. This results in the average Gibbs energy of activation, [Formula: see text], being approximately independent of MW. Measurements of the temperature dependence of [Formula: see text] as a function of depth below the free surface indicate the inherent entropic barrier, i.e., the entropy of activation corresponding to [Formula: see text] = 0, has an exponential dependence on the distance from the free surface before reaching the bulk value. This results in [Formula: see text] near the free surface being lower than the bulk. Combining these observations results in a model where the average fluctuation rate of the γ-relaxation has a “double-exponential” depth dependence. This model can explain the depth dependence of [Formula: see text] in polystyrene films. The characteristic length of enhanced dynamics is ∼6 nm and approximately independent of MW near room temperature.
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Affiliation(s)
- Iain McKenzie
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Derek Fujimoto
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Victoria L. Karner
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Ruohong Li
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - W. Andrew MacFarlane
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Ryan M. L. McFadden
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | | | - Matthew R. Pearson
- Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - Adam N. Raegen
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | | | - John O. Ticknor
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - James A. Forrest
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
- Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada
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4
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Chat K, Tu W, Beena Unni A, Adrjanowicz K. Influence of Tacticity on the Glass-Transition Dynamics of Poly(methyl methacrylate) (PMMA) under Elevated Pressure and Geometrical Nanoconfinement. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01341] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Katarzyna Chat
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - Wenkang Tu
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - Aparna Beena Unni
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - Karolina Adrjanowicz
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
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5
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Diogo HP, Moura Ramos JJ. New contributions from thermal and dielectric techniques to the understanding of the dynamic properties of medium to long chain poly (propylene glycols). POLYM ENG SCI 2021. [DOI: 10.1002/pen.25687] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Hermínio P. Diogo
- CQE–Centro de Química Estrutural, Complexo I, Instituto Superior Técnico Universidade de Lisboa Lisbon Portugal
| | - Joaquim J. Moura Ramos
- CQE–Centro de Química Estrutural, Complexo I, Instituto Superior Técnico Universidade de Lisboa Lisbon Portugal
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6
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Khairy Y, Alvarez F, Arbe A, Colmenero J. Disentangling Self-Atomic Motions in Polyisobutylene by Molecular Dynamics Simulations. Polymers (Basel) 2021; 13:polym13040670. [PMID: 33672368 PMCID: PMC7927061 DOI: 10.3390/polym13040670] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/08/2021] [Accepted: 02/17/2021] [Indexed: 01/16/2023] Open
Abstract
We present fully atomistic molecular dynamics simulations on polyisobutylene (PIB) in a wide temperature range above the glass transition. The cell is validated by direct comparison of magnitudes computed from the simulation and measured by neutron scattering on protonated samples reported in previous works. Once the reliability of the simulation is assured, we exploit the information in the atomic trajectories to characterize the dynamics of the different kinds of atoms in PIB. All of them, including main-chain carbons, show a crossover from Gaussian to non-Gaussian behavior in the intermediate scattering function that can be described in terms of the anomalous jump diffusion model. The full characterization of the methyl-group hydrogen motions requires accounting for rotational motions. We show that the usually assumed statistically independence of rotational and segmental motions fails in this case. We apply the rotational rate distribution model to correlation functions calculated for the relative positions of methyl-group hydrogens with respect to the carbon atom at which they are linked. The contributions to the vibrational density of states are also discussed. We conclude that methyl-group rotations are coupled with the main-chain dynamics. Finally, we revise in the light of the simulations the hypothesis and conclusions made in previously reported neutron scattering investigations on protonated samples trying to address the origin of the dielectric β-process.
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Affiliation(s)
- Yasmin Khairy
- Physics Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt;
- Centro de Física de Materiales (CSIC, UPV/EHU), Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain; (F.A.); (A.A.)
| | - Fernando Alvarez
- Centro de Física de Materiales (CSIC, UPV/EHU), Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain; (F.A.); (A.A.)
- Materials Physics Center MPC, Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain
- Departamento de Polímeros y Materiales Avanzados: Física, Química y Tecnología (UPV/EHU), Apartado 1072, E-20080 San Sebastián, Spain
| | - Arantxa Arbe
- Centro de Física de Materiales (CSIC, UPV/EHU), Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain; (F.A.); (A.A.)
- Materials Physics Center MPC, Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain
| | - Juan Colmenero
- Centro de Física de Materiales (CSIC, UPV/EHU), Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain; (F.A.); (A.A.)
- Materials Physics Center MPC, Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain
- 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
- Correspondence:
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7
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Alexandris S, Peponaki K, Petropoulou P, Sakellariou G, Vlassopoulos D. Linear Viscoelastic Response of Unentangled Polystyrene Bottlebrushes. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00266] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Stelios Alexandris
- Institute of Electronic Structure and Laser, FORTH, Heraklion 700 13, Crete, Greece
| | - Katerina Peponaki
- Institute of Electronic Structure and Laser, FORTH, Heraklion 700 13, Crete, Greece
- Department of Materials Science and Technology, University of Crete, Heraklion 700 13, Crete, Greece
| | - Paraskevi Petropoulou
- Department of Chemistry, National and Kapodistrian University of Athens, Athens 15784, Greece
| | - Georgios Sakellariou
- Department of Chemistry, National and Kapodistrian University of Athens, Athens 15784, Greece
| | - Dimitris Vlassopoulos
- Institute of Electronic Structure and Laser, FORTH, Heraklion 700 13, Crete, Greece
- Department of Materials Science and Technology, University of Crete, Heraklion 700 13, Crete, Greece
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8
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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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9
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Manz AS, Aly M, Kaufman LJ. Correlating fragility and heterogeneous dynamics in polystyrene through single molecule studies. J Chem Phys 2019; 151:084501. [PMID: 31470706 DOI: 10.1063/1.5114905] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Many macroscopic properties of polymers depend on their molecular weight, with one notable example being glass transition temperature: polymers with higher molecular weights typically have higher glass transition temperatures than their lower molecular weight polymeric and oligomeric counterparts. Polymeric systems close to their glass transition temperatures also exhibit interesting properties, showing both high (and molecular weight dependent) fragility and strong evidence of dynamic heterogeneity. While studies have detailed the correlations between molecular weight and fragility, studies clearly detailing correlations between molecular weight and degree of heterogeneous dynamics are lacking. In this study, we use single molecule rotational measurements to investigate the impact of molecular weight on polystyrene's degree of heterogeneity near its glass transition temperature. To this end, two types of fluorescent probes are embedded in films composed of polystyrene ranging from 0.6 to 1364.0 kg mol-1. We find correlation between polystyrene molecular weight, fragility, and degree of dynamic heterogeneity as reported by single molecule stretching exponents but do not find clear correlation between these quantities and time scales associated with dynamic exchange.
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Affiliation(s)
- Alyssa S Manz
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Mariam Aly
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Laura J Kaufman
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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10
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Talik A, Tarnacka M, Dzienia A, Kaminska E, Kaminski K, Paluch M. High-Pressure Studies on the Chain and Segmental Dynamics of a Series of Poly(propylene glycol) Derivatives. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00692] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Andrzej Dzienia
- Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland
| | - Ewa Kaminska
- Department of Pharmacognosy and Phytochemistry, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia in Katowice, Jagiellonska 4, 41-200 Sosnowiec, Poland
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11
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Shen J, Yildirim E, Li S, Caydamli Y, Pasquinelli MA, Tonelli AE. Role of Local Polymer Conformations on the Diverging Glass Transition Temperatures and Dynamic Fragilities of Isotactic-, Syndiotactic-, and Atactic-Poly(methyl methacrylate)s. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00434] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jialong Shen
- Fiber & Polymer Science Program and Department of Textile Engineering, Chemistry & Science, North Carolina State University, Raleigh, North Carolina 27695-8301, United States
| | - Erol Yildirim
- Fiber & Polymer Science Program and Department of Textile Engineering, Chemistry & Science, North Carolina State University, Raleigh, North Carolina 27695-8301, United States
| | - Shanshan Li
- Fiber & Polymer Science Program and Department of Textile Engineering, Chemistry & Science, North Carolina State University, Raleigh, North Carolina 27695-8301, United States
| | - Yavuz Caydamli
- Fiber & Polymer Science Program and Department of Textile Engineering, Chemistry & Science, North Carolina State University, Raleigh, North Carolina 27695-8301, United States
| | - Melissa A. Pasquinelli
- Fiber & Polymer Science Program and Department of Textile Engineering, Chemistry & Science, North Carolina State University, Raleigh, North Carolina 27695-8301, United States
| | - Alan E. Tonelli
- Fiber & Polymer Science Program and Department of Textile Engineering, Chemistry & Science, North Carolina State University, Raleigh, North Carolina 27695-8301, United States
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12
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Govinna ND, Keller T, Schick C, Cebe P. Melt-electrospinning of poly(ether ether ketone) fibers to avoid sulfonation. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.03.041] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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13
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Heczko D, Kamińska E, Minecka A, Tarnacka M, Waliłko P, Kasprzycka A, Kamiński K, Paluch M. Studies on the molecular dynamics of acetylated oligosaccharides of different topologies (linear versus cyclic). Carbohydr Polym 2018; 206:273-280. [PMID: 30553322 DOI: 10.1016/j.carbpol.2018.10.118] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 10/12/2018] [Accepted: 10/31/2018] [Indexed: 10/27/2022]
Abstract
In this paper, the molecular dynamics and thermal properties of representative acetylated linear and cyclic oligosaccharides: acTRE, acRAF, acSTA, ac-α-CD, ac-β-CD, ac-γ-CD, have been investigated by using broadband dielectric spectroscopy and differential scanning calorimetry. We found that there are marked differences in the dynamics of the structural and secondary relaxation processes in both groups of materials. Just to mention a variation in the distribution of the structural relaxation times as well as different evolutions of the glass transition temperature (Tg) and fragility (m) versus molecular weight (Mw), which seem to be affected by the shape of the molecule, strain in the carbohydrate ring and mobility of side acetyl moieties.
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Affiliation(s)
- Dawid Heczko
- Department of Pharmacognosy and Phytochemistry, Medical University of Silesia in Katowice, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, ul. Jagiellonska 4, 41-200 Sosnowiec, Poland.
| | - Ewa Kamińska
- Department of Pharmacognosy and Phytochemistry, Medical University of Silesia in Katowice, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, ul. Jagiellonska 4, 41-200 Sosnowiec, Poland.
| | - Aldona Minecka
- Department of Pharmacognosy and Phytochemistry, Medical University of Silesia in Katowice, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, ul. Jagiellonska 4, 41-200 Sosnowiec, Poland
| | - Magdalena Tarnacka
- Silesian Center for Education and Interdisciplinary Research, University of Silesia, ul. 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland; Institute of Physics, University of Silesia, ul. 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
| | - Patrycja Waliłko
- Silesian Technical University of Technology, Department of Chemistry, ul. Krzywoustego 4, 44-100 Gliwice, Poland; Biotechnology Centre, Silesian Technical University of Technology, ul. Krzywoustego 8, 44-100 Gliwice, Poland
| | - Anna Kasprzycka
- Silesian Technical University of Technology, Department of Chemistry, ul. Krzywoustego 4, 44-100 Gliwice, Poland; Biotechnology Centre, Silesian Technical University of Technology, ul. Krzywoustego 8, 44-100 Gliwice, Poland
| | - Kamil Kamiński
- Silesian Center for Education and Interdisciplinary Research, University of Silesia, ul. 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland; Institute of Physics, University of Silesia, ul. 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
| | - Marian Paluch
- Silesian Center for Education and Interdisciplinary Research, University of Silesia, ul. 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland; Institute of Physics, University of Silesia, ul. 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
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14
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Giuntoli A, Leporini D. Boson Peak Decouples from Elasticity in Glasses with Low Connectivity. PHYSICAL REVIEW LETTERS 2018; 121:185502. [PMID: 30444381 DOI: 10.1103/physrevlett.121.185502] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 09/07/2018] [Indexed: 06/09/2023]
Abstract
We perform molecular-dynamics simulations of the vibrational and elastoplastic properties of polymeric glasses and crystals and the corresponding atomic systems. We evidence that the elastic scaling of the density of states in the low-frequency boson peak (BP) region is different in crystals and glasses. Also, we see that the BP of the polymeric glass is nearly coincident with the one of the atomic glasses, thus revealing that the former-unlike the elasticity-is controlled by nonbonding interactions only. Our results suggest that the interpretation of the BP in terms of the macroscopic elasticity, discussed in highly connected systems, does not hold for systems with low connectivity.
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Affiliation(s)
- A Giuntoli
- Dipartimento di Fisica "Enrico Fermi," Università di Pisa, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
| | - D Leporini
- Dipartimento di Fisica "Enrico Fermi," Università di Pisa, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy and Istituto per i Processi Chimico-Fisici-Consiglio Nazionale delle Ricerche (IPCF-CNR), via Giuseppe Moruzzi 1, I-56124 Pisa, Italy
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15
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Romo-Uribe A. Viscoelasticity and microstructure of POSS-methyl methacrylate nanocomposites. Dynamics and entanglement dilution. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.06.018] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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16
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Zulli F, Giordano M, Andreozzi L. Chain-Length Dependence of Relaxation and Dynamics in Poly(methyl methacrylate) from Oligomers to Polymers. Macromolecules 2018. [DOI: 10.1021/acs.macromol.7b02330] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fabio Zulli
- Department of Physics “E. Fermi”, University of Pisa and IPCF-CNR, Pisa, Italy
| | - Marco Giordano
- Department of Physics “E. Fermi”, University of Pisa and IPCF-CNR, Pisa, Italy
| | - Laura Andreozzi
- Department of Physics “E. Fermi”, University of Pisa and IPCF-CNR, Pisa, Italy
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17
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Xing K, Tress M, Cao P, Cheng S, Saito T, Novikov VN, Sokolov AP. Hydrogen-bond strength changes network dynamics in associating telechelic PDMS. SOFT MATTER 2018; 14:1235-1246. [PMID: 29355867 DOI: 10.1039/c7sm01805c] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Associating polymers are a class of materials with widely tunable macroscopic properties. Here, we investigate telechelic poly(dimethylsiloxanes) of several molecular weights (MW) with different hydrogen bonding end groups. Besides the well-established increase of the glass transition temperature Tg with decreasing MW, Tg remains unchanged as the end group varies from NH2 over OH to COOH. For the latter system, a 2nd Tg is found which indicates a segregated phase. In contrast, rheological measurements reveal a qualitative difference in the viscoelastic response of NH2-terminated and COOH-terminated chains. Both systems show clear signs of end group association, but only the latter exhibits an extended rubbery plateau. All features observed in the rheology experiments have corresponding processes in the dielectric measurements. This provides insight into the underlying molecular mechanisms, and especially reveals that many end groups of the COOH-terminated chains phase segregate while a certain fraction forms binary associates and remains non-segregated. In contrast, the NH2-terminated systems form only binary associates increasing the effective chain length, whereas the COOH-terminated system consists of two types of associates forming a crosslinked network. Remarkably, a single species of end group forms two qualitatively different types of associates: transient bonds which allow stress release by a bond-partner exchange mechanism, and effectively permanent bonds formed by a phase segregated fraction of end groups which are stable on the timescale of the transient mechanism.
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Affiliation(s)
- Kunyue Xing
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA.
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18
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Bocharova V, Wojnarowska Z, Cao PF, Fu Y, Kumar R, Li B, Novikov VN, Zhao S, Kisliuk A, Saito T, Mays JW, Sumpter B, Sokolov AP. Influence of Chain Rigidity and Dielectric Constant on the Glass Transition Temperature in Polymerized Ionic Liquids. J Phys Chem B 2017; 121:11511-11519. [DOI: 10.1021/acs.jpcb.7b09423] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- V. Bocharova
- Chemical
Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Z. Wojnarowska
- Chemical
Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| | - Peng-Fei Cao
- Chemical
Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Y. Fu
- Department of Aerospace Engineering & Engineering Mechanics, University of Cincinnati, Cincinnati, Ohio 45220, United States
| | - R. Kumar
- Center
for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge Tennessee 37831, United States
- Computational Sciences & Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bingrui Li
- Chemical
Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - V. N. Novikov
- Department
of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - S. Zhao
- Department
of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - A. Kisliuk
- Chemical
Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - T. Saito
- Chemical
Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Jimmy W. Mays
- Chemical
Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Department
of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - B.G. Sumpter
- Center
for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge Tennessee 37831, United States
- Computational Sciences & Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - A. P. Sokolov
- Chemical
Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Department
of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
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19
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Romo-Uribe A. Viscoelastic Behavior of Unentangled POSS–Styrene Nanocomposites and the Modification of Macromolecular Dynamics. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01645] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Angel Romo-Uribe
- R&D, Advanced Science & Technology Division, Johnson & Johnson Vision, Jacksonville, Florida 32256, United States
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20
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Ahn Y, Song Y, Kim H, Kwak SY. Formation of cellulose-carbene complex via depolymerization in ILs: Dependence of IL types on kinetics, conformation and dispersity. Carbohydr Polym 2017; 159:86-93. [DOI: 10.1016/j.carbpol.2016.12.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 12/06/2016] [Accepted: 12/07/2016] [Indexed: 10/20/2022]
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21
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Zhang L, Elupula R, Grayson SM, Torkelson JM. Suppression of the Fragility-Confinement Effect via Low Molecular Weight Cyclic or Ring Polymer Topology. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02280] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
| | - Ravinder Elupula
- Department
of Chemistry, Tulane University, New Orleans, Louisiana 70118, United States
| | - Scott M. Grayson
- Department
of Chemistry, Tulane University, New Orleans, Louisiana 70118, United States
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22
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Dalle-Ferrier C, Kisliuk A, Hong L, Carini G, Carini G, D’Angelo G, Alba-Simionesco C, Novikov VN, Sokolov AP. Why many polymers are so fragile: A new perspective. J Chem Phys 2016; 145:154901. [DOI: 10.1063/1.4964362] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- C. Dalle-Ferrier
- Laboratoire Léon Brillouin, UMR 12, CEA-CNRS, 91191 Saclay, France
| | - A. Kisliuk
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - L. Hong
- Institute of Natural Sciences & Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
| | - G. Carini
- IPCF del CNR, UOS di Messina, I-98158 Messina, Italy
| | - G. Carini
- Dipartimento di Fisica e Scienze della Terra, Università di Messina, I-98166 Messina, Italy
| | - G. D’Angelo
- Dipartimento di Fisica e Scienze della Terra, Università di Messina, I-98166 Messina, Italy
| | | | - V. N. Novikov
- Department of Chemistry and Joint Institute for Neutron Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - A. P. Sokolov
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Chemistry and Joint Institute for Neutron Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA
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23
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Cox LM, Killgore JP, Li Z, Long R, Sanders AW, Xiao J, Ding Y. Influences of Substrate Adhesion and Particle Size on the Shape Memory Effect of Polystyrene Particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:3691-3698. [PMID: 27023181 DOI: 10.1021/acs.langmuir.6b00588] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Formulations and applications of micro- and nanoscale polymer particles have proliferated rapidly in recent years, yet knowledge of their mechanical behavior has not grown accordingly. In this study, we examine the ways that compressive strain, substrate surface energy, and particle size influence the shape memory cycle of polystyrene particles. Using nanoimprint lithography, differently sized particles are programmed into highly deformed, temporary shapes in contact with substrates of differing surface energies. Atomic force microscopy is used to obtain in situ measurements of particle shape recovery kinetics, and scanning electron microscopy is employed to assess differences in the profiles of particles at the conclusion of the shape memory cycle. Finally, finite element models are used to investigate the growing impact of surface energies at smaller length scales. Results reveal that the influence of substrate adhesion on particle recovery is size-dependent and can become dominating at submicron length scales.
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Affiliation(s)
- Lewis M Cox
- Department of Mechanical Engineering and ‡Material Science and Engineering Program, University of Colorado at Boulder , Boulder, Colorado 80309-0427, United States
- Applied Chemicals and Materials Division and §Radio Frequency Technology Division, National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Jason P Killgore
- Department of Mechanical Engineering and ‡Material Science and Engineering Program, University of Colorado at Boulder , Boulder, Colorado 80309-0427, United States
- Applied Chemicals and Materials Division and §Radio Frequency Technology Division, National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Zhengwei Li
- Department of Mechanical Engineering and ‡Material Science and Engineering Program, University of Colorado at Boulder , Boulder, Colorado 80309-0427, United States
- Applied Chemicals and Materials Division and §Radio Frequency Technology Division, National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Rong Long
- Department of Mechanical Engineering and ‡Material Science and Engineering Program, University of Colorado at Boulder , Boulder, Colorado 80309-0427, United States
- Applied Chemicals and Materials Division and §Radio Frequency Technology Division, National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Aric W Sanders
- Department of Mechanical Engineering and ‡Material Science and Engineering Program, University of Colorado at Boulder , Boulder, Colorado 80309-0427, United States
- Applied Chemicals and Materials Division and §Radio Frequency Technology Division, National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Jianliang Xiao
- Department of Mechanical Engineering and ‡Material Science and Engineering Program, University of Colorado at Boulder , Boulder, Colorado 80309-0427, United States
- Applied Chemicals and Materials Division and §Radio Frequency Technology Division, National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Yifu Ding
- Department of Mechanical Engineering and ‡Material Science and Engineering Program, University of Colorado at Boulder , Boulder, Colorado 80309-0427, United States
- Applied Chemicals and Materials Division and §Radio Frequency Technology Division, National Institute of Standards and Technology , Boulder, Colorado 80305, United States
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24
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Zhang L, Marsiglio JA, Lan T, Torkelson JM. Dramatic Tunability of the Glass Transition Temperature and Fragility of Low Molecular Weight Polystyrene by Initiator Fragments Located at Chain Ends. Macromolecules 2016. [DOI: 10.1021/acs.macromol.5b02704] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Lanhe Zhang
- Department of Materials Science and Engineering and ‡Department of
Chemical and Biological
Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - John A. Marsiglio
- Department of Materials Science and Engineering and ‡Department of
Chemical and Biological
Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Tian Lan
- Department of Materials Science and Engineering and ‡Department of
Chemical and Biological
Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - John M. Torkelson
- Department of Materials Science and Engineering and ‡Department of
Chemical and Biological
Engineering, Northwestern University, Evanston, Illinois 60208, United States
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25
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Lan T, Torkelson JM. Fragility-Confinement Effects: Apparent Universality as a Function of Scaled Thickness in Films of Freely Deposited, Linear Polymer and Its Absence in Densely Grafted Brushes. Macromolecules 2016. [DOI: 10.1021/acs.macromol.5b02489] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tian Lan
- Department of Materials Science
and Engineering and ‡Department of Chemical and Biological
Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - John M. Torkelson
- Department of Materials Science
and Engineering and ‡Department of Chemical and Biological
Engineering, Northwestern University, Evanston, Illinois 60208, United States
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26
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27
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Chremos A, Douglas JF. Communication: When does a branched polymer become a particle? J Chem Phys 2015; 143:111104. [DOI: 10.1063/1.4931483] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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28
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29
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Osterwinter C, Schubert C, Tonhauser C, Wilms D, Frey H, Friedrich C. Rheological Consequences of Hydrogen Bonding: Linear Viscoelastic Response of Linear Polyglycerol and Its Permethylated Analogues as a General Model for Hydroxyl-Functional Polymers. Macromolecules 2014. [DOI: 10.1021/ma501674x] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Carina Osterwinter
- Freiburg
Materials Research Center (FMF), University of Freiburg, Stefan-Meier-Str.
21, D-79104 Freiburg, Germany
| | - Christian Schubert
- Institute
of Organic Chemistry, Organic and Macromolecular Chemistry, University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Christoph Tonhauser
- Institute
of Organic Chemistry, Organic and Macromolecular Chemistry, University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Daniel Wilms
- Institute
of Organic Chemistry, Organic and Macromolecular Chemistry, University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Holger Frey
- Institute
of Organic Chemistry, Organic and Macromolecular Chemistry, University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Christian Friedrich
- Freiburg
Materials Research Center (FMF), University of Freiburg, Stefan-Meier-Str.
21, D-79104 Freiburg, Germany
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30
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Tohmyoh H, Sakamoto Y. Acoustic study of a linear low-density polyethylene film after modification of the crystalline structure by heating. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:024902. [PMID: 24593386 DOI: 10.1063/1.4865757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report on a hybrid microscopy technique that enables us to measure the acoustic properties of a thin polymer film together with an optical microscope image of the corresponding area. Linear low-density polyethylene films are heated to various temperatures and examined by the technique. Density of the film is increased by heating and its sound velocity is decreased compared with a film without heating. Also, spherulites can clearly be seen in the optical microscope image, supporting the thermal shrinkage of the film which can be detected by the present technique.
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Affiliation(s)
- Hironori Tohmyoh
- Department of Nanomechanics, Tohoku University, Aoba 6-6-01, Aramaki, Aoba-ku, Sendai 980-8579, Japan
| | - Yuhei Sakamoto
- Department of Nanomechanics, Tohoku University, Aoba 6-6-01, Aramaki, Aoba-ku, Sendai 980-8579, Japan
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31
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Khairy Y, Alvarez F, Arbe A, Colmenero J. Collective Features in Polyisobutylene. A Study of the Static and Dynamic Structure Factor by Molecular Dynamics Simulations. Macromolecules 2013. [DOI: 10.1021/ma401669y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Y. Khairy
- Centro
de Física de Materiales (CSIC−UPV/EHU), Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
| | - F. Alvarez
- Centro
de Física de Materiales (CSIC−UPV/EHU), Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
- Departamento de Física de Materiales (UPV/EHU), Apartado 1072, 20080 San Sebastián, Spain
| | - A. Arbe
- Centro
de Física de Materiales (CSIC−UPV/EHU), Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
| | - J. Colmenero
- Centro
de Física de Materiales (CSIC−UPV/EHU), Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
- Departamento de Física de Materiales (UPV/EHU), Apartado 1072, 20080 San Sebastián, Spain
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastián, Spain
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32
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Sun H, Ntetsikas K, Avgeropoulos A, Wang SQ. Breakdown of Time–Temperature Equivalence in Startup Uniaxial Extension of Entangled Polymer Melts. Macromolecules 2013. [DOI: 10.1021/ma3025255] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hao Sun
- Morton Institute
of Polymer
Science and Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
| | - Konstantinos Ntetsikas
- Department of Materials Science
and Engineering, University of Ioannina University Campus, Ioannina, Greece 45110
| | - Apostolos Avgeropoulos
- Department of Materials Science
and Engineering, University of Ioannina University Campus, Ioannina, Greece 45110
| | - Shi-Qing Wang
- Morton Institute
of Polymer
Science and Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
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33
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Hofmann M, Herrmann A, Abou Elfadl A, Kruk D, Wohlfahrt M, Rössler EA. Glassy, Rouse, and Entanglement Dynamics As Revealed by Field Cycling 1H NMR Relaxometry. Macromolecules 2012. [DOI: 10.1021/ma202371p] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Hofmann
- Experimentalphysik
II, Universität Bayreuth, D-95440
Bayreuth, Germany
| | - A. Herrmann
- Experimentalphysik
II, Universität Bayreuth, D-95440
Bayreuth, Germany
| | - A. Abou Elfadl
- Experimentalphysik
II, Universität Bayreuth, D-95440
Bayreuth, Germany
| | - D. Kruk
- University of Warmia & Mazury Olsztyn, Faculty of Mathematics & Computer Science, Sloneczna 54, PL-10710 Olsztyn, Poland
| | - M. Wohlfahrt
- Experimentalphysik
II, Universität Bayreuth, D-95440
Bayreuth, Germany
| | - E. A. Rössler
- Experimentalphysik
II, Universität Bayreuth, D-95440
Bayreuth, Germany
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34
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Raftopoulos K, Janowski B, Apekis L, Pielichowski K, Pissis P. Molecular mobility and crystallinity in polytetramethylene ether glycol in the bulk and as soft component in polyurethanes. Eur Polym J 2011. [DOI: 10.1016/j.eurpolymj.2011.07.020] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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35
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Molecular weight scaling of the spherulite growth rate in isothermally melt crystallized polyethylene nanocomposites. POLYMER 2011. [DOI: 10.1016/j.polymer.2011.10.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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36
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Merino E, Atlas S, Raihane M, Belfkira A, Lahcini M, Hult A, Dionísio M, Correia N. Molecular dynamics of poly(ATRIF) homopolymer and poly(AN-co-ATRIF) copolymer investigated by dielectric relaxation spectroscopy. Eur Polym J 2011. [DOI: 10.1016/j.eurpolymj.2011.04.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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37
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Eremchev IY, Vainer YG, Naumov AV, Kador L. Low-temperature dynamics in amorphous polymers and low-molecular-weight glasses--what is the difference? Phys Chem Chem Phys 2010; 13:1843-8. [PMID: 21183979 DOI: 10.1039/c0cp01690j] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Numerous experiments have shown that the low-temperature dynamics of a wide variety of disordered solids is qualitatively universal. However, most of these results were obtained with ensemble-averaging techniques which hide the local parameters of the dynamic processes. We used single-molecule (SM) spectroscopy for direct observation of the dynamic processes in disordered solids with different internal structure and chemical composition. The surprising result is that the dynamics of low-molecular-weight glasses and short-chain polymers does not follow, on a microscopic level, the current concept of low-temperature glass dynamics. An extra contribution to the dynamics was detected causing irreproducible jumps and drifts of the SM spectra on timescales between milliseconds and minutes. In most matrices consisting of small molecules and oligomers, the spectral dynamics was so fast that SM spectra could hardly or not at all be recorded and only irregular fluorescence flares were observed. These results provide new mechanistic insight into the behavior of glasses in general: At low temperatures, the local dynamics of disordered solids is not universal but depends on the structure and chemical composition of the material.
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Affiliation(s)
- Ivan Yu Eremchev
- Molecular Spectroscopy Department, Institute for Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow reg., 142190, Russia
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38
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Bormuth A, Henritzi P, Vogel M. Chain-Length Dependence of the Segmental Relaxation in Polymer Melts: Molecular Dynamics Simulation Studies on Poly(propylene oxide). Macromolecules 2010. [DOI: 10.1021/ma101721d] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. Bormuth
- Institut für Festkörperphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - P. Henritzi
- Institut für Festkörperphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - M. Vogel
- Institut für Festkörperphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
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39
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Dalle-Ferrier C, Niss K, Sokolov AP, Frick B, Serrano J, Alba-Simionesco C. The Role of Chain Length in Nonergodicity Factor and Fragility of Polymers. Macromolecules 2010. [DOI: 10.1021/ma101622f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Cécile Dalle-Ferrier
- Laboratoire de Chimie Physique, Bâtiment 349, Université Paris-Sud, 91405 Orsay, France. Current address: Soft Matter group, IPkM, Heinrich Heine Universität, Düsseldorf, Germany
| | - Kristine Niss
- Laboratoire de Chimie Physique, Bâtiment 349, Université Paris-Sud, 91405 Orsay, France. Current address: Glass and Time, IMFUFA, Department of Sciences, Building 27 Roskilde University RUC Postbox 260 DK-4000 Roskilde, Denmark
| | - Alexei P. Sokolov
- Chemical Sciences Division at ORNL, Oak Ridge; and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | | | - Jorge Serrano
- ICREA-Departament de Física Aplicada, EPSC, Universitat Politècnica de Catalunya, Esteve Terradas 15, 08860 Castelldefels, Spain
| | - Christiane Alba-Simionesco
- Laboratoire de Chimie Physique, Bâtiment 349, Université Paris-Sud, 91405 Orsay, France. Current address: Laboratoire Léon Brillouin, CEA-CNRS, Saclay, France
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40
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Parker NG, Mather ML, Morgan SP, Povey MJW. Longitudinal acoustic properties of poly(lactic acid) and poly(lactic-
co
-glycolic acid). Biomed Mater 2010; 5:055004. [DOI: 10.1088/1748-6041/5/5/055004] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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41
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42
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Dalle-Ferrier C, Simon S, Zheng W, Badrinarayanan P, Fennell T, Frick B, Zanotti JM, Alba-Simionesco C. Consequence of excess configurational entropy on fragility: the case of a polymer-oligomer blend. PHYSICAL REVIEW LETTERS 2009; 103:185702. [PMID: 19905814 DOI: 10.1103/physrevlett.103.185702] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2009] [Indexed: 05/28/2023]
Abstract
By taking advantage of the molecular weight dependence of the glass transition of polymers and their ability to form perfectly miscible blends, we propose a way to modify the fragility of a system, from fragile to strong, keeping the same glass properties, i.e., vibrational density of states, mean-square displacement, and local structure. Both slow and fast dynamics are investigated by calorimetry and neutron scattering in an athermal polystyrene-oligomer blend, and compared to those of a pure 17-mer polystyrene considered to be a reference, of the same Tg. Whereas the blend and the pure 17-mer have the same heat capacity in the glass and in the liquid, their fragilities differ strongly. Thus, the difference in fragility is related to an extra configurational entropy created by the mixing process and acting at a scale much larger than the interchain distance, without affecting the fast dynamics and the structure of the glass.
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Affiliation(s)
- C Dalle-Ferrier
- Laboratoire de Chimie Physique, UMR 8000, Bâtiment 349, Université, Paris-Sud, 91405 Orsay, France
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43
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Stukalin EB, Douglas JF, Freed KF. Application of the entropy theory of glass formation to poly(α-olefins). J Chem Phys 2009; 131:114905. [DOI: 10.1063/1.3216109] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.7] [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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Elfadl AA, Herrmann A, Hintermeyer J, Petzold N, Novikov VN, Rössler EA. Molecular Weight Dependence of Fragility in Polymers. Macromolecules 2009. [DOI: 10.1021/ma900666z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. Abou Elfadl
- Experimentalphysik II, Universität Bayreuth, 95440 Bayreuth, Germany, and IA&E, Russian Academy of Sciences, Novosibirsk 630090, Russia
| | - A. Herrmann
- Experimentalphysik II, Universität Bayreuth, 95440 Bayreuth, Germany, and IA&E, Russian Academy of Sciences, Novosibirsk 630090, Russia
| | - J. Hintermeyer
- Experimentalphysik II, Universität Bayreuth, 95440 Bayreuth, Germany, and IA&E, Russian Academy of Sciences, Novosibirsk 630090, Russia
| | - N. Petzold
- Experimentalphysik II, Universität Bayreuth, 95440 Bayreuth, Germany, and IA&E, Russian Academy of Sciences, Novosibirsk 630090, Russia
| | - V. N. Novikov
- Experimentalphysik II, Universität Bayreuth, 95440 Bayreuth, Germany, and IA&E, Russian Academy of Sciences, Novosibirsk 630090, Russia
| | - E. A. Rössler
- Experimentalphysik II, Universität Bayreuth, 95440 Bayreuth, Germany, and IA&E, Russian Academy of Sciences, Novosibirsk 630090, Russia
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45
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Hong L, Gujrati PD, Novikov VN, Sokolov AP. Molecular cooperativity in the dynamics of glass-forming systems: A new insight. J Chem Phys 2009; 131:194511. [DOI: 10.1063/1.3266508] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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46
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Niss K, Dalle-Ferrier C, Giordano VM, Monaco G, Frick B, Alba-Simionesco C. Glassy properties and viscous slowing down: An analysis of the correlation between nonergodicity factor and fragility. J Chem Phys 2008; 129:194513. [DOI: 10.1063/1.3005646] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hintermeyer J, Herrmann A, Kahlau R, Goiceanu C, Rössler EA. Molecular Weight Dependence of Glassy Dynamics in Linear Polymers Revisited. Macromolecules 2008. [DOI: 10.1021/ma8016794] [Citation(s) in RCA: 114] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Hintermeyer
- Experimentalphysik II, Universität Bayreuth, 95440 Bayreuth, Germany
| | - A. Herrmann
- Experimentalphysik II, Universität Bayreuth, 95440 Bayreuth, Germany
| | - R. Kahlau
- Experimentalphysik II, Universität Bayreuth, 95440 Bayreuth, Germany
| | - C. Goiceanu
- Experimentalphysik II, Universität Bayreuth, 95440 Bayreuth, Germany
| | - E. A. Rössler
- Experimentalphysik II, Universität Bayreuth, 95440 Bayreuth, Germany
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Kunal K, Robertson CG, Pawlus S, Hahn SF, Sokolov AP. Role of Chemical Structure in Fragility of Polymers: A Qualitative Picture. Macromolecules 2008. [DOI: 10.1021/ma801155c] [Citation(s) in RCA: 269] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kumar Kunal
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909, Center for Research and Technology, Bridgestone Americas, Akron, Ohio 44317-0001, Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007, Poland, and The Dow Chemical Company, Midland, Michigan 48674
| | - Christopher G. Robertson
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909, Center for Research and Technology, Bridgestone Americas, Akron, Ohio 44317-0001, Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007, Poland, and The Dow Chemical Company, Midland, Michigan 48674
| | - Sebastian Pawlus
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909, Center for Research and Technology, Bridgestone Americas, Akron, Ohio 44317-0001, Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007, Poland, and The Dow Chemical Company, Midland, Michigan 48674
| | - Steven F. Hahn
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909, Center for Research and Technology, Bridgestone Americas, Akron, Ohio 44317-0001, Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007, Poland, and The Dow Chemical Company, Midland, Michigan 48674
| | - Alexei P. Sokolov
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909, Center for Research and Technology, Bridgestone Americas, Akron, Ohio 44317-0001, Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007, Poland, and The Dow Chemical Company, Midland, Michigan 48674
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49
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Kaminski K, Kaminska E, Wlodarczyk P, Pawlus S, Kimla D, Kasprzycka A, Paluch M, Ziolo J, Szeja W, Ngai KL. Dielectric Studies on Mobility of the Glycosidic Linkage in Seven Disaccharides. J Phys Chem B 2008; 112:12816-23. [DOI: 10.1021/jp804240a] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. Kaminski
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - E. Kaminska
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - P. Wlodarczyk
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - S. Pawlus
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - D. Kimla
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - A. Kasprzycka
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - M. Paluch
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - J. Ziolo
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - W. Szeja
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - K. L. Ngai
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
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50
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Dudowicz J, Freed KF, Douglas JF. Generalized Entropy Theory of Polymer Glass Formation. ADVANCES IN CHEMICAL PHYSICS 2008. [DOI: 10.1002/9780470238080.ch3] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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