1
|
Investigating nature of stresses in extension and compression of glassy polymers via stress relaxation. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122517] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
2
|
Ngai K, Pawlus S, Paluch M. Explanation of the difference in temperature and pressure dependences of the Debye relaxation and the structural α-relaxation near T of monohydroxy alcohols. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2019.110617] [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]
|
3
|
Ginzburg VV. A simple mean-field model of glassy dynamics and glass transition. SOFT MATTER 2020; 16:810-825. [PMID: 31840706 DOI: 10.1039/c9sm01575b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We propose a phenomenological model to describe the equilibrium dynamic behavior of amorphous glassy materials. It is assumed that a material can be represented by a lattice of cooperatively re-arranging regions (CRRs), with each CRR having two states, the low-temperature "solid" and the high-temperature "liquid". At low temperatures, the material exhibits two characteristic relaxation times, corresponding to the slow large-scale motion between the "solid" CRRs (α-relaxation) and the faster local motion within individual CRRs (β-relaxation). At high temperatures, the α- and β-relaxation times merge, as observed experimentally and suggested by the "Coupling Model" framework. Our new approach is labeled "Two-state, two (time)scale model" or TS2. It is shown that the TS2 treatment can successfully describe the "two-Arrhenius" relaxation time behavior described in several recent experiments. We also apply TS2 to describe the pressure- and molecular-weight dependence of the glass transition temperature in bulk polymers, as well as its dependence on film thickness in thin films.
Collapse
Affiliation(s)
- Valeriy V Ginzburg
- Core Research and Development, The Dow Chemical Company, Midland, MI 48674, USA.
| |
Collapse
|
4
|
Ngai KL, Capaccioli S, Wang LM. Segmental α-Relaxation for the First Step and Sub-Rouse Modes for the Second Step in Enthalpy Recovery in the Glassy State of Polystyrene. Macromolecules 2019. [DOI: 10.1021/acs.macromol.8b02125] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- K. L. Ngai
- CNR-IPCF, Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
- State Key Lab of Metastable Materials Science and Technology and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
| | - Simone Capaccioli
- CNR-IPCF, Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - Li-Min Wang
- State Key Lab of Metastable Materials Science and Technology and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
| |
Collapse
|
5
|
Tyagi M, Casalini R, Roland CM. SHORT TIME AND STRUCTURAL DYNAMICS IN POLYPROPYLENE GLYCOL NANOCOMPOSITE. RUBBER CHEMISTRY AND TECHNOLOGY 2017. [DOI: 10.5254/rct.17.82664] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
ABSTRACT
The dynamics of polypropylene glycol, both neat and attached to silica nanoparticles, were investigated using elastic neutron backscattering and dielectric spectroscopy. The mean square displacement measured by the former is suppressed by the particles at temperatures corresponding to a dielectric secondary relaxation (that involves only a portion of the repeat unit) and the segmental relaxation (glass transition). Despite the suppression of the displacements, the motions are faster in the nanocomposite, primarily due to poorer packing (lower density) at the particle interface. At very low temperatures we discovered a new dynamic process in the polymer. Reflecting its very local nature, this process is unaffected by attachment of the chains to the silica.
Collapse
Affiliation(s)
- M. Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-6102
- Department of Materials Science, University of Maryland, College Park, MD 20742
| | - R. Casalini
- Naval Research Laboratory, Chemistry Division, Washington, DC 20375-5342
| | - C. M. Roland
- Naval Research Laboratory, Chemistry Division, Washington, DC 20375-5342
| |
Collapse
|
6
|
Puosi F, Chulkin O, Bernini S, Capaccioli S, Leporini D. Thermodynamic scaling of vibrational dynamics and relaxation. J Chem Phys 2016; 145:234904. [DOI: 10.1063/1.4971297] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- F. Puosi
- Dipartimento di Fisica “Enrico Fermi,” Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - O. Chulkin
- Dipartimento di Fisica “Enrico Fermi,” Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - S. Bernini
- Dipartimento di Fisica “Enrico Fermi,” Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - S. Capaccioli
- Dipartimento di Fisica “Enrico Fermi,” Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
- IPCF-CNR, UOS, Pisa, Italy
| | - D. Leporini
- Dipartimento di Fisica “Enrico Fermi,” Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
- IPCF-CNR, UOS, Pisa, Italy
| |
Collapse
|
7
|
Liu G, Wang SQ. Entangled Linear Polymer Solutions at High Shear: From Strain Softening to Hardening. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b02053] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gengxin Liu
- Department of Polymer
Science, University of Akron, Akron, Ohio 44325-3909, United States
| | - Shi-Qing Wang
- Department of Polymer
Science, University of Akron, Akron, Ohio 44325-3909, United States
| |
Collapse
|
8
|
Andersson O, Johari GP. Thermal conductivity of Glycerol's liquid, glass, and crystal states, glass-liquid-glass transition, and crystallization at high pressures. J Chem Phys 2016; 144:064504. [PMID: 26874494 DOI: 10.1063/1.4941335] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
To investigate the effects of local density fluctuations on phonon propagation in a hydrogen bonded structure, we studied the thermal conductivity κ of the crystal, liquid, and glassy states of pure glycerol as a function of the temperature, T, and the pressure, p. We find that the following: (i) κcrystal is 3.6-times the κliquid value at 140 K at 0.1 MPa and 2.2-times at 290 K, and it varies with T according to 138 × T(-0.95); (ii) the ratio κliquid (p)/κliquid (0.1 MPa) is 1.45 GPa(-1) at 280 K, which, unexpectedly, is about the same as κcrystal (p)/κcrystal (0.1 MPa) of 1.42 GPa(-1) at 298 K; (iii) κglass is relatively insensitive to T but sensitive to the applied p (1.38 GPa(-1) at 150 K); (iv) κglass-T plots show an enhanced, pressure-dependent peak-like feature, which is due to the glass to liquid transition on heating; (v) continuous heating cold-crystallizes ultraviscous glycerol under pressure, at a higher T when p is high; and (vi) glycerol formed by cooling at a high p and then measured at a low p has a significantly higher κ than the glass formed by cooling at a low p. On heating at a fixed low p, its κ decreases before its glass-liquid transition range at that p is reached. We attribute this effect to thermally assisted loss of the configurational and vibrational instabilities of a glass formed at high p and recovered at low p, which is different from the usual glass-aging effect. While the heat capacity, entropy, and volume of glycerol crystal are less than those for its glass and liquid, κcrystal of glycerol, like its elastic modulus and refractive index, is higher. We discuss these findings in terms of the role of fluctuations in local density and structure, and the relations between κ and the thermodynamic quantities.
Collapse
Affiliation(s)
- Ove Andersson
- Department of Physics, Umeå University, 901 87 Umeå, Sweden
| | - G P Johari
- Department of Materials Science and Engineering, McMaster University, Hamilton, Ontario L8S 4L7, Canada
| |
Collapse
|
9
|
Masiewicz E, Grzybowski A, Grzybowska K, Pawlus S, Pionteck J, Paluch M. Adam-Gibbs model in the density scaling regime and its implications for the configurational entropy scaling. Sci Rep 2015; 5:13998. [PMID: 26365623 PMCID: PMC4568462 DOI: 10.1038/srep13998] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 07/31/2015] [Indexed: 11/15/2022] Open
Abstract
To solve a long-standing problem of condensed matter physics with determining a proper description of the thermodynamic evolution of the time scale of molecular dynamics near the glass transition, we have extended the well-known Adam-Gibbs model to describe the temperature-volume dependence of structural relaxation times, τα(T, V). We also employ the thermodynamic scaling idea reflected in the density scaling power law, τα = f(T−1V−γ), recently acknowledged as a valid unifying concept in the glass transition physics, to differentiate between physically relevant and irrelevant attempts at formulating the temperature-volume representations of the Adam-Gibbs model. As a consequence, we determine a straightforward relation between the structural relaxation time τα and the configurational entropy SC, giving evidence that also SC(T, V) = g(T−1V−γ) with the exponent γ that enables to scale τα(T, V). This important findings have meaningful implications for the connection between thermodynamics and molecular dynamics near the glass transition, because it implies that τα can be scaled with SC.
Collapse
Affiliation(s)
- Elżbieta Masiewicz
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland.,Silesian Center for Education and Interdisciplinary Research, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland
| | - Andrzej Grzybowski
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland.,Silesian Center for Education and Interdisciplinary Research, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland
| | - Katarzyna Grzybowska
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland.,Silesian Center for Education and Interdisciplinary Research, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland
| | - Sebastian Pawlus
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland.,Silesian Center for Education and Interdisciplinary Research, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland
| | - Jürgen Pionteck
- Leibniz Institute of Polymer Research Dresden, Hohe Str. 6, D-01069 Dresden, Germany
| | - Marian Paluch
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland.,Silesian Center for Education and Interdisciplinary Research, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland
| |
Collapse
|
10
|
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.
Collapse
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.
| | | | | |
Collapse
|
11
|
Arrese-Igor S, Alegría A, Colmenero J. Chain Dynamics on Crossing the Glass Transition: Nonequilibrium Effects and Recovery of the Temperature Dependence of the Structural Relaxation. ACS Macro Lett 2014; 3:1215-1219. [PMID: 35610828 DOI: 10.1021/mz500508t] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
In this paper we report thermally stimulated depolarization current results on the chain and segmental dynamics of two monodisperse polyisoprenes accessing both dynamics at ultralow frequency range and exploring the relationship between segmental and chain time scales when crossing the glass transition. In this range, we have recorded experimental evidence of nonequilibrium effects on the slowest chain mode dynamics. The nonequilibrium effects seem to occur simultaneously for both chain and α-relaxation. Moreover, detailed analysis strongly indicates the recovery of an even T-dependence for the chain and α-relaxation dynamics on crossing glass transition and in the glassy state. The obtained results can be understood taking into account the different temperature dependences of the length scales involved in the segmental and chain relaxations.
Collapse
Affiliation(s)
- S. Arrese-Igor
- Centro
de Física de Materiales (MPC), Centro mixto CSIC-UPV/EHU, Paseo
Manuel Lardizabal 5, 20018 San Sebastián, Spain
| | - A. Alegría
- Centro
de Física de Materiales (MPC), Centro mixto CSIC-UPV/EHU, Paseo
Manuel Lardizabal 5, 20018 San Sebastián, Spain
- Departamento
de Física de Materiales UPV/EHU, Apartado 1072, 20080 San Sebastián, Spain
| | - J. Colmenero
- Centro
de Física de Materiales (MPC), Centro mixto CSIC-UPV/EHU, Paseo
Manuel 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 Lardizabal 4, 20018 San Sebastián, Spain
| |
Collapse
|
12
|
Ngai KL, Plazek DJ. Thermo-Rheological, Piezo-Rheological, and TVγ-Rheological Complexities of Viscoelastic Mechanisms in Polymers. Macromolecules 2014. [DOI: 10.1021/ma501843u] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- K. L. Ngai
- Dipartimento
di Fisica, Università di Pisa, Largo B. Pontecorvo 3, I-56127, Pisa, Italy
- CNR-IPCF, Largo B. Pontecorvo 3, I-56127, Pisa, Italy
| | - D. J. Plazek
- Department of Mechanical
Engineering and Material Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261United States
| |
Collapse
|
13
|
Sun H, Liu G, Ntetsikas K, Avgeropoulos A, Wang SQ. Rheology of Entangled Polymers Not Far above Glass Transition Temperature: Transient Elasticity and Intersegmental Viscous Stress. Macromolecules 2014. [DOI: 10.1021/ma500899s] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Hao Sun
- Morton Institute of Polymer Science and Engineering, University of Akron, Akron, Ohio 44325-3909, United States
| | - Gengxin Liu
- Morton Institute of Polymer Science and Engineering, University of Akron, Akron, Ohio 44325-3909, United States
| | - Konstantinos Ntetsikas
- Department of Materials Science and Engineering, University of Ioannina, University Campus, Ioannina, 45110, Greece
| | - Apostolos Avgeropoulos
- Department of Materials Science and Engineering, University of Ioannina, University Campus, Ioannina, 45110, Greece
| | - Shi-Qing Wang
- Morton Institute of Polymer Science and Engineering, University of Akron, Akron, Ohio 44325-3909, United States
| |
Collapse
|
14
|
Dynamics of α and α′ relaxation in layered silicate/polystyrene nanocomposites studied by anelastic spectroscopy. CHINESE JOURNAL OF POLYMER SCIENCE 2013. [DOI: 10.1007/s10118-013-1339-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
15
|
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
| |
Collapse
|
16
|
Ngai KL, Roland CM. Note: Thermorheological complexity in polymers and the problem of the glass transition. J Chem Phys 2013; 139:036101. [DOI: 10.1063/1.4813322] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
17
|
Nanoconfined segmental dynamics in miscible polymer blend nanocomposites: the influence of the geometry of nanoparticles. IRANIAN POLYMER JOURNAL 2013. [DOI: 10.1007/s13726-013-0160-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
18
|
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
| |
Collapse
|
19
|
Ngai KL, Habasaki J, Prevosto D, Capaccioli S, Paluch M. Thermodynamic scaling of α-relaxation time and viscosity stems from the Johari-Goldstein β-relaxation or the primitive relaxation of the coupling model. J Chem Phys 2012; 137:034511. [DOI: 10.1063/1.4736547] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
|
20
|
Ribeiro MCC, Scopigno T, Ruocco G. Computer simulation study of thermodynamic scaling of dynamics of 2Ca(NO3)2·3KNO3. J Chem Phys 2011; 135:164510. [DOI: 10.1063/1.3656872] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
21
|
Qazvini NT, Chehrazi E. Glass Transition Behavior and Dynamic Fragility of PMMA-SAN Miscible Blend-Clay Nanocomposites. J MACROMOL SCI B 2011. [DOI: 10.1080/00222348.2011.563179] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- N. Taheri Qazvini
- a School of Chemistry , University College of Science, University of Tehran , Tehran, Iran
- b Biomaterials Research Center (BRC) , University of Tehran , Tehran, Iran
| | - E. Chehrazi
- c Mahshahr Branch , Amirkabir University of Technology , Mahshahr, Iran
| |
Collapse
|
22
|
Fragiadakis D, Casalini R, Bogoslovov RB, Robertson CG, Roland CM. Dynamic Heterogeneity and Density Scaling in 1,4-Polyisoprene. Macromolecules 2011. [DOI: 10.1021/ma102795w] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- D. Fragiadakis
- Naval Research Laboratory, Code 6120, Washington, D.C. 20375-5342, United States
| | - R. Casalini
- Naval Research Laboratory, Code 6120, Washington, D.C. 20375-5342, United States
| | - R. B. Bogoslovov
- Naval Research Laboratory, Code 6120, Washington, D.C. 20375-5342, United States
- Enterprise Sciences, Inc., College Park, Maryland 20740, United States
| | - C. G. Robertson
- Bridgestone Americas, Center for Research and Technology, 1200 Firestone Parkway, Akron, Ohio 44317-0001, United States
| | - C. M. Roland
- Naval Research Laboratory, Code 6120, Washington, D.C. 20375-5342, United States
| |
Collapse
|
23
|
Pawlus S, Sokolov AP, Paluch M, Mierzwa M. Influence of Pressure on Chain and Segmental Dynamics in Polyisoprene. Macromolecules 2010. [DOI: 10.1021/ma100383r] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sebastian Pawlus
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
| | - Alexei P. Sokolov
- Chemical Sciences Division, ORNL, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600
| | - Marian Paluch
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
| | - Michal Mierzwa
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
| |
Collapse
|
24
|
Javadi A, Mohammadi N, Garmabi H, Pourrahimi AM, Mashayekhi J. Influence of impact load-temperature conformity on toughening of poly(vinyl chloride) by core-shell rubber particles. J Appl Polym Sci 2009. [DOI: 10.1002/app.29275] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
25
|
Affiliation(s)
- K. L. Ngai
- Naval Research Laboratory, Washington, D.C. 20375-5342, and Department of Material Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - D. J. Plazek
- Naval Research Laboratory, Washington, D.C. 20375-5342, and Department of Material Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - C. M. Roland
- Naval Research Laboratory, Washington, D.C. 20375-5342, and Department of Material Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| |
Collapse
|
26
|
Merabia S, Long D. Heterogeneous Dynamics and Pressure Dependence of the Dynamics in van der Waals Liquids. Macromolecules 2008. [DOI: 10.1021/ma702524j] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Samy Merabia
- Laboratoire de Physique des Solides, CNRS and Université de Paris XI, Bat. 510, 91405 Orsay Cédex, France, and Departament de Fisica Fonamental, Universitat de Barcelona, Marti i Franqués 1, 08028 Barcelona, Spain
| | - Didier Long
- Laboratoire de Physique des Solides, CNRS and Université de Paris XI, Bat. 510, 91405 Orsay Cédex, France, and Departament de Fisica Fonamental, Universitat de Barcelona, Marti i Franqués 1, 08028 Barcelona, Spain
| |
Collapse
|
27
|
Kunal K, Paluch M, Roland CM, Puskas JE, Chen Y, Sokolov AP. Polyisobutylene: A most unusual polymer. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/polb.21473] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
28
|
Segmental dynamics of reactively prepared polystyrene blends: Unsaturated polyester resin versus high impact polystyrene. J Appl Polym Sci 2007. [DOI: 10.1002/app.26365] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
29
|
Ding Y, Sokolov AP. Breakdown of Time−Temperature Superposition Principle and Universality of Chain Dynamics in Polymers. Macromolecules 2006. [DOI: 10.1021/ma052607b] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yifu Ding
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909
| | - Alexei P. Sokolov
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909
| |
Collapse
|
30
|
Tsolou G, Harmandaris VA, Mavrantzas VG. Atomistic molecular dynamics simulation of the temperature and pressure dependences of local and terminal relaxations in cis-1,4-polybutadiene. J Chem Phys 2006; 124:084906. [PMID: 16512741 DOI: 10.1063/1.2174003] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The dynamics of cis-1,4-polybutadiene (cis-1,4-PB) over a wide range of temperature and pressure conditions is explored by conducting atomistic molecular dynamics (MD) simulations with a united atom model on a 32-chain C128 cis-1,4-PB system. The local or segmental dynamics is analyzed in terms of the dipole moment time autocorrelation function (DACF) of the simulated polymer and its temperature and pressure variations, for temperatures as low as 195 K and pressures as high as 3 kbars. By Fourier transforming the DACF, the dielectric spectrum, epsilon* = epsilon' + i epsilon" = epsilon*omega, is computed and the normalized epsilon"/epsilon(max)" vs omega/omega(max) plot is analyzed on the basis of the time-temperature and time-pressure superposition principles. The relative contribution of thermal energy and volume to the segmental and chain relaxation processes are also calculated and evaluated in terms of the ratio of the activation energy at constant volume to the activation energy at constant pressure, Q(V)/Q(P). Additional results for the temperature and pressure dependences of the Rouse times describing terminal relaxation in the two polymers show that, in the regime of the temperature and pressure conditions covered here, segmental and chain relaxations are influenced similarly by the pressure and temperature variations. This is in contrast to what is measured experimentally [see, e.g., G. Floudas and T. Reisinger, J. Chem. Phys. 111, 5201 (1999); C. M. Roland et al.,J. Polym. Sci. Part B, 41, 3047 (2003)] for other, chemically more complex polymers that pressure has a stronger influence on the dynamics of segmental mode than on the dynamics of the longest normal mode, at least for the regime of temperature and pressure conditions covered in the present MD simulations.
Collapse
Affiliation(s)
- Georgia Tsolou
- Institute of Chemical Engineering and High-Temperature Chemical Processes (FORTH-ICE/HT), Patras GR 26504, Greece
| | | | | |
Collapse
|
31
|
Ngai K. Interpreting the dynamics of nano-confined glass-formers and thin polymer films: Importance of starting from a viable theory for the bulk. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/polb.20923] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
32
|
Roland CM, Casalini R. The Role of Density and Temperature in the Dynamics of Polymer Blends. Macromolecules 2005. [DOI: 10.1021/ma051481f] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- C. M. Roland
- Chemistry Division, Code 6120, Naval Research Laboratory, Washington, D.C. 20375-5342, and Chemistry Department, George Mason University, Fairfax, Virginia 22030
| | - R. Casalini
- Chemistry Division, Code 6120, Naval Research Laboratory, Washington, D.C. 20375-5342, and Chemistry Department, George Mason University, Fairfax, Virginia 22030
| |
Collapse
|