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Mashita R, Saito M, Yoda Y, Nagasawa N, Bito Y, Kikuchi T, Kishimoto H, Seto M, Kanaya T. Microscopic Observation of the Anisotropy of the Johari-Goldstein-β Process in Cross-Linked Polybutadiene on Stretching by Time-Domain Interferometry. ACS Macro Lett 2024; 13:847-852. [PMID: 38916259 DOI: 10.1021/acsmacrolett.4c00274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/26/2024]
Abstract
The strain dependence of the Johari-Goldstein (JG)-β relaxation time, as well as the directional dependence, was systematically investigated for stretched cross-linked polybutadiene using time-domain interferometry. We found that the strain dependence of the JG-β relaxation time is directionally dependent, contrary to expectation: the relaxation time of the JG-β motion, whose displacement is perpendicular to the stretching direction, decreases with stretching, whereas the relaxation time of the parallel JG-β motion changes little. This result is distinct from the previously reported strain dependence of the α relaxation time, where the relaxation time increases isotropically with stretching. Thus, the difference in the strain dependence of the relaxation time between the α and JG-β processes suggests a microscopic origin and requires the modification of the conventional dynamic picture for stretched polymers.
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Affiliation(s)
- Ryo Mashita
- Research Center for Advanced Technology & Innovation, Research & Development HQ, Sumitomo Rubber Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 651-0071, Japan
| | - Makina Saito
- Department of Physics, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Yoshitaka Yoda
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - Nobumoto Nagasawa
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - Yasumasa Bito
- Research Center for Advanced Technology & Innovation, Research & Development HQ, Sumitomo Rubber Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 651-0071, Japan
| | - Tatsuya Kikuchi
- Research Center for Advanced Technology & Innovation, Research & Development HQ, Sumitomo Rubber Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 651-0071, Japan
| | - Hiroyuki Kishimoto
- Research Center for Advanced Technology & Innovation, Research & Development HQ, Sumitomo Rubber Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 651-0071, Japan
| | - Makoto Seto
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Sennan, Osaka 590-0494, Japan
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Mashita R, Saito M, Yoda Y, Kishimoto H, Seto M, Kanaya T. Microscopic observation of the effects of elongation on the polymer chain dynamics of crosslinked polybutadiene using quasi-elastic γ-ray scattering. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:1180-1186. [PMID: 36073876 PMCID: PMC9455202 DOI: 10.1107/s1600577522007998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 08/08/2022] [Indexed: 06/15/2023]
Abstract
A synchrotron-radiation-based quasi-elastic γ-ray scattering system has been developed that uses time-domain interferometry to observe microscopic polymer dynamics under uniaxial deformation. The stress-producing mechanism of crosslinked polybutadiene has been studied from a microscopic viewpoint. It was found that the mean relaxation time ⟨τ⟩ of the microscopic polymer motion observed over a relatively high temperature (T) range (i.e. T-1 < 0.0045 K-1) increased with elongation on both the intra- and intermolecular scales. Following an extensive strain dependence study, it was found that the strain dependences of both the intra- and intermolecular ⟨τ⟩ changed with the stress dependence. It was therefore suggested that ⟨τ⟩ increased due to the constraint of the local polymer chain motion caused by elongation. The local molecular dynamics of polymer chains under uniaxial deformation could be evaluated at intra- and intermolecular scales separately for the first time using our method.
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Affiliation(s)
- Ryo Mashita
- Chemical Analysis Center, Sumitomo Rubber Industries Ltd, Tsutsui-cho, Chuo-ku, Kobe, Hyogo 651-0071, Japan
| | - Makina Saito
- Department of Physics, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Yoshitaka Yoda
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - Hiroyuki Kishimoto
- Chemical Analysis Center, Sumitomo Rubber Industries Ltd, Tsutsui-cho, Chuo-ku, Kobe, Hyogo 651-0071, Japan
| | - Makoto Seto
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Sennan, Osaka 590-0494, Japan
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Choi T, Fragiadakis D, Roland CM, Runt J. Microstructure and Segmental Dynamics of Polyurea under Uniaxial Deformation. Macromolecules 2012. [DOI: 10.1021/ma300128d] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Taeyi Choi
- Department of Materials Science and Engineering, The Pennsylvania State University,
University Park, Pennsylvania 16802, United States
| | - Daniel Fragiadakis
- Chemistry Division, Naval Research Laboratory, Code 6120, Washington, D.C. 20375, United
States
| | - C. Michael Roland
- Chemistry Division, Naval Research Laboratory, Code 6120, Washington, D.C. 20375, United
States
| | - James Runt
- Department of Materials Science and Engineering, The Pennsylvania State University,
University Park, Pennsylvania 16802, United States
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Munch E, Pelletier J, Sixou B, Vigier G. Molecular mobility of crosslinked elastomers stretched above Tg. POLYMER 2006. [DOI: 10.1016/j.polymer.2006.03.043] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Lenhart JL, Wu WL. Deviations in the Thermal Properties of Ultrathin Polymer Network Films. Macromolecules 2002. [DOI: 10.1021/ma011903v] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Joseph L. Lenhart
- National Institute of Standards and Technology, 100 Bureau Drive Stop 8541, Gaithersburg, Maryland 20899-8541
| | - Wen-li Wu
- National Institute of Standards and Technology, 100 Bureau Drive Stop 8541, Gaithersburg, Maryland 20899-8541
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Hernández LG, Rueda LI, Díaz AR, Antón CC. Dynamic mechanical properties of natural rubber vulcanizates with different curing systems and static strain. POLYMER 1992. [DOI: 10.1016/0032-3861(92)90648-g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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