| Autor: |
Mashita R; 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., Saito M; Department of Physics, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan., Yoda Y; Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan., Nagasawa N; Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan., Bito Y; 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., Kikuchi T; 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., Kishimoto H; 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., Seto M; Institute for Integrated Radiation and Nuclear Science, Kyoto University, Sennan, Osaka 590-0494, Japan., Kanaya T; Kyoto University, Sakyo-ku, Kyoto 606-8585, Japan. |
| Abstrakt: |
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. |
