1
|
Yadav P, Srivastava AK, Yadav MK, Kripal R, Singh V, Lee DB, Lee JH. Synthesis and dielectric characterization of polycarbonate/multi-wall carbon nanotubes nanocomposite. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2015.10.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
2
|
Alexandrino EM, da Conceição TF, Felisberti MI. Improvement of processing and mechanical properties of polyetherimide by antiplasticization with resorcinol bis(diphenyl phosphate). J Appl Polym Sci 2014. [DOI: 10.1002/app.40619] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | | | - Maria I. Felisberti
- Institute of Chemistry, University of Campinas (UNICAMP); Campinas 13083-970 Brazil
| |
Collapse
|
3
|
Molecular Order and Dynamics of Tris(2-ethylhexyl)phosphate Confined in Uni-Directional Nanopores. Z PHYS CHEM 2012. [DOI: 10.1524/zpch.2012.0287] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
Infrared Transition Moment Orientational Analysis (IR–TMOA) and Broadband Dielectric Spectroscopy (BDS) are combined to study molecular order and dynamics of the glass-forming liquid Tris(2-ethylhexy)phosphate (TEHP) confined in uni-directional nanopores with diameters of 4, 8, and 10.4 nm. The former method enables one to determine the molecular order parameter of specific IR transition moments. It is observed that the central P=O moiety of TEHP has a weak orientational effect (molecular order parameter S
z
= −0.1 ± 0.04) due the nanoporous confinement, in contrast to the terminal C–H groups. BDS traces the dynamic glass transition of the guest molecules in a broad spectral range and at widely varying temperature. An enhancement of the mobility takes place when approaching the glass transition temperature and becomes more pronounced with decreasing pore diameter. This is attributed to a slight reduction of the density of the confined liquid caused by the 2-dimensional geometrical constraint.
Collapse
|
4
|
Ramos JA, Larrañaga M, Mondragon I, Salgueiro W, Somoza A, Goyanes S, Rubiolo GH. Correlation between nanohole volume and mechanical properties of amine-cured epoxy resin blended with poly(ethylene oxide). POLYM ADVAN TECHNOL 2008. [DOI: 10.1002/pat.1242] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
5
|
Psurek T, Soles CL, Page KA, Cicerone MT, Douglas JF. Quantifying Changes in the High-Frequency Dynamics of Mixtures by Dielectric Spectroscopy. J Phys Chem B 2008; 112:15980-90. [DOI: 10.1021/jp8034314] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tatiana Psurek
- Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - Christopher L. Soles
- Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - Kirt A. Page
- Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - Marcus T. Cicerone
- Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - Jack F. Douglas
- Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
| |
Collapse
|
6
|
Riggleman RA, Douglas JF, de Pablo JJ. Characterization of the potential energy landscape of an antiplasticized polymer. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2007; 76:011504. [PMID: 17677447 DOI: 10.1103/physreve.76.011504] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2007] [Revised: 05/02/2007] [Indexed: 05/16/2023]
Abstract
The nature of the individual transitions on the potential energy landscape (PEL) associated with particle motion are directly examined for model fragile glass-forming polymer melts, and the results are compared to those of an antiplasticized polymer system. In previous work, we established that the addition of antiplasticizer reduces the fragility of glass formation so that the antiplasticized material is a stronger glass former. In the present work, we find that the antiplasticizing molecules reduce the energy barriers for relaxation compared to the pure polymer, implying that the antiplasticized system has smaller barriers to overcome in order to explore its configuration space. We examine the cooperativity of segmental motion in these bulk fluids and find that more extensive stringlike collective motion enables the system to overcome larger potential energy barriers, in qualitative agreement with both the Stillinger-Weber and Adam-Gibbs views of glass formation. Notably, the stringlike collective motion identified by our PEL analysis corresponds to incremental displacements that occur within larger-scale stringlike particle displacement processes associated with PEL metabasin transitions that mediate structural relaxation. These "substrings" nonetheless seem to exhibit changes in relative size with antiplasticization similar to those observed in "superstrings" that arise at elevated temperatures. We also study the effects of confinement on the energy barriers in each system. Film confinement makes the energy barriers substantially smaller in the pure polymer, while it has little effect on the energy barriers in the antiplasticized system. This observation is qualitatively consistent with our previous studies of stringlike motion in these fluids at higher temperatures and with recent experimental measurements by Torkelson and co-workers.
Collapse
Affiliation(s)
- Robert A Riggleman
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | | | | |
Collapse
|
7
|
Riggleman RA, Douglas JF, de Pablo JJ. Tuning polymer melt fragility with antiplasticizer additives. J Chem Phys 2007; 126:234903. [PMID: 17600442 DOI: 10.1063/1.2742382] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A polymer-diluent model exhibiting antiplasticization has been developed and characterized by molecular dynamics simulations. Antiplasticizer molecules are shown to decrease the glass transition temperature Tg but to increase the elastic moduli of the polymeric material in the low-temperature glass state. Moreover, the addition of antiplasticizing particles renders the polymer melt a stronger glass-forming material as determined by changes in the characteristic temperatures of glass formation, the fragility parameter D from fits to the Vogel-Folcher-Tamman-Hesse equation, and through the observation of the temperature dependence of the size of cooperatively rearranging regions (strings) in each system. The length of the strings exhibits a weaker temperature dependence in the antiplasticized glass-forming system than in the more fragile pure polymer, consistent with the Adam-Gibbs model of glass formation. Unexpectedly, the strings become increasingly concentrated in the antiplasticizer particles upon cooling. Finally, we discuss several structural indicators of cooperative dynamics, and find that the dynamic propensity (local Debye-Waller factor <u2>p) does seem to provide a strong correlation with local molecular displacements at long times. The authors also consider maps of the propensity, and find that the antiplasticized system exhibits larger fluctuations over smaller length scales compared to the pure polymer.
Collapse
Affiliation(s)
- Robert A Riggleman
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | | | | |
Collapse
|
8
|
Alegría A, Mitxelena O, Colmenero J. On the Molecular Motions Originating from the Dielectric γ-Relaxation of Bisphenol-A Polycarbonate. Macromolecules 2006. [DOI: 10.1021/ma0520545] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Angel Alegría
- Departamento de Física de Materiales UPV/EHU and Unidad de Física de Materiales CSIC−UPV/EHU, Facultad de Química, Apartado 1072, 20080 San Sebastián, Spain, and Fundación Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastián, Spain
| | - Olatz Mitxelena
- Departamento de Física de Materiales UPV/EHU and Unidad de Física de Materiales CSIC−UPV/EHU, Facultad de Química, Apartado 1072, 20080 San Sebastián, Spain, and Fundación Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastián, Spain
| | - Juan Colmenero
- Departamento de Física de Materiales UPV/EHU and Unidad de Física de Materiales CSIC−UPV/EHU, Facultad de Química, Apartado 1072, 20080 San Sebastián, Spain, and Fundación Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastián, Spain
| |
Collapse
|
9
|
Arrese-Igor S, Arbe A, Alegría A, Colmenero J, Frick B. Sub-Tg dynamics in polycarbonate by neutron scattering and its relation with secondary γ relaxation. J Chem Phys 2005; 123:014907. [PMID: 16035869 DOI: 10.1063/1.1948372] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have investigated the dynamics of phenylene rings in glassy bisphenol-A (BPA) polycarbonate (PC) by means of quasielastic neutron scattering. Taking advantage of selective deuteration of the samples, we have studied the incoherent scattering of hydrogens in phenylene rings on the one hand, and on the other hand the coherent quasielastic scattering of all the atoms in the sample. Two different types of neutron spectrometers, time of flight and backscattering, were used in order to cover a wide dynamic range, which extends from microscopic (approximately 10(-13) s) to mesoscopic (approximately 10(-9) s) times. Moreover, neutron-diffraction experiments with polarization analysis were carried out in order to characterize the structural features, and the relative coherent and incoherent contributions of the samples investigated. In contrast with previous studies of phenylene ring dynamics in BPA polysulfone performed by us also by neutron scattering, phenylene rings in BPA PC exhibit an "extra" motion in addition to those found for BPA polysulfone's phenylene rings. This extra motion of the rings in PC perfectly correlates with the main carbonate group motion followed by dielectric spectroscopy and allows us to (i) consistently interpret the PC's gamma relaxation in terms of two different motions; and (ii) experimentally confirm the relation between the motion of phenylene rings and carbonate groups within BPA PC formerly predicted by computational methods.
Collapse
Affiliation(s)
- S Arrese-Igor
- Departamento de Física de Materiales, Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), Apartado 1072, 20080 San Sebastián, Spain.
| | | | | | | | | |
Collapse
|
10
|
Quintana I, Arbe A, Colmenero J, Frick B. Dynamics of Polyethersulfone Phenylene Rings: A Quasielastic Neutron Scattering Study. Macromolecules 2005. [DOI: 10.1021/ma047535n] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- I. Quintana
- Departamento de Física de Materiales UPV/EHU, Apartado 1072, 20080 San Sebastián, Spain, Unidad Física de Materiales (CSIC−UPV/EHU), Apartado 1072, 20080 San Sebastián, Spain, Donostia International Physics Center, Apartado 1072, 20080 San Sebastián, Spain, and Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France
| | - A. Arbe
- Departamento de Física de Materiales UPV/EHU, Apartado 1072, 20080 San Sebastián, Spain, Unidad Física de Materiales (CSIC−UPV/EHU), Apartado 1072, 20080 San Sebastián, Spain, Donostia International Physics Center, Apartado 1072, 20080 San Sebastián, Spain, and Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France
| | - J. Colmenero
- Departamento de Física de Materiales UPV/EHU, Apartado 1072, 20080 San Sebastián, Spain, Unidad Física de Materiales (CSIC−UPV/EHU), Apartado 1072, 20080 San Sebastián, Spain, Donostia International Physics Center, Apartado 1072, 20080 San Sebastián, Spain, and Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France
| | - B. Frick
- Departamento de Física de Materiales UPV/EHU, Apartado 1072, 20080 San Sebastián, Spain, Unidad Física de Materiales (CSIC−UPV/EHU), Apartado 1072, 20080 San Sebastián, Spain, Donostia International Physics Center, Apartado 1072, 20080 San Sebastián, Spain, and Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France
| |
Collapse
|
11
|
Zhang S, Painter PC, Runt J. Suppression of the Dielectric Secondary Relaxation of Poly(2-vinylpyridine) by Strong Intermolecular Hydrogen Bonding. Macromolecules 2004. [DOI: 10.1021/ma035830m] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shihai Zhang
- Department of Materials Science and Engineering and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
| | - Paul C. Painter
- Department of Materials Science and Engineering and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
| | - James Runt
- Department of Materials Science and Engineering and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
| |
Collapse
|
12
|
Arrese-Igor S, Arbe A, Alegría A, Colmenero J, Frick B. Phenylene ring dynamics in bisphenol-A-polysulfone by neutron scattering. J Chem Phys 2004; 120:423-36. [PMID: 15267305 DOI: 10.1063/1.1630013] [Citation(s) in RCA: 20] [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 have investigated the dynamics of phenylene rings in a glassy polysulfone (bisphenol-A-polysulfone) by means of quasielastic neutron scattering. Nowadays it is well known that these molecular motions are directly connected with the mechanical properties of engineering thermoplastics in general. The particular system investigated by us has the advantage that by selective deuteration of the methyl groups, the neutron scattering measured is dominated by the incoherent contribution from the protons in the phenylene rings. In this way, the dynamics of such molecular groups can be experimentally isolated. Two different types of neutron spectrometers: time of flight and backscattering, were used in order to cover a wide dynamic range, which extends from microscopic (10(-13) s) to mesoscopic (10(-9) s) times. Moreover, neutron diffraction experiments with polarization analysis were also carried out in order to characterize the structural features of the sample investigated. Fast oscillations of increasing amplitude with temperature and pi-flips are identified for phenylene rings motions. Due to the structural disorder characteristic of the amorphous state, both molecular motions display a broad distribution of relaxation times, which spreads over several orders of magnitude. Based on the results obtained, we propose a model for phenylene rings dynamics, which combines the two kinds of molecular motions identified. This model nicely describes the neutron scattering results in the whole dynamic range investigated.
Collapse
Affiliation(s)
- S Arrese-Igor
- Departamento de Física de Materiales UPV/EHU, Apartado 1072, 20080 San Sebastián, Spain
| | | | | | | | | |
Collapse
|
13
|
Hori H, Urakawa O, Adachi K. Dielectric Study of Dynamical Heterogeneity in Blends of Polystyrene and Low Mass Compounds. Polym J 2003. [DOI: 10.1295/polymj.35.721] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
14
|
Xiao C, Wu J, Yang L, Yee AF, Xie L, Gidley D, Ngai KL, Rizos AK. Positronium Annihilation Lifetime and Dynamic Mechanical Studies of γ-Relaxation in BPA-PC and TMBPA-PC Plasticized by TOP. Macromolecules 1999. [DOI: 10.1021/ma980203w] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | | | - K. L. Ngai
- Naval Research Laboratory, Washington, D.C. 20375-5320
| | - A. K. Rizos
- University of Crete, Department of Chemistry and FORTH, Heraklion, Crete, Greece
| |
Collapse
|