期刊
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
卷 68, 期 7, 页码 896-900出版社
KOREAN PHYSICAL SOC
DOI: 10.3938/jkps.68.896
关键词
PDMS; Elastic property; Dielectric; Brillouin scattering; Relaxation process
资金
- Hallym University Research Fund [HRF-201511-008]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2013R1A1A2006582]
The temperature dependences of the acoustic properties and the dielectric relaxation times of polydimethylsiloxane were investigated by using high-resolution Brillouin and broadband dielectric spectroscopies. The longitudinal sound velocity showed a large increase upon approaching the glass transition temperature while the acoustic absorption coefficient exhibited a maximum at similar to 263 K. Comparison of these results with previous ultrasonic data revealed a substantial frequency dispersion of the acoustic properties of this silicone-based elastomer. The relaxation times derived from the acoustic absorption peaks were consistent with the temperature dependence of the dielectric relaxation time of the structural a process, indicating a strong coupling between the acoustic waves and the segmental motions of the main chains.
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