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The effect of intramolecular relaxations on the damping of longitudinal and transverse phonons in polysiloxanes studied by Brillouin spectroscopy.
- Source :
-
The Journal of chemical physics [J Chem Phys] 2008 Jan 07; Vol. 128 (1), pp. 014507. - Publication Year :
- 2008
-
Abstract
- The effect of intramolecular relaxations on the damping of longitudinal and transverse phonons was studied in poly(methylphenylsiloxane) (PMPS) and poly(ethylmethylsiloxane) (PEMS) polymers by means of Brillouin spectroscopy. It is shown that studies of the polarized and depolarized Brillouin spectra as functions of temperature and pressure allow for the separation of the contributions of the internal and structural relaxations to the damping of longitudinal and transverse phonons, respectively. In polymers with intramolecular relaxations these processes contribute not only to the damping of longitudinal phonons, according to theoretical predictions, but also transverse phonons, in contradiction to the theory.
Details
- Language :
- English
- ISSN :
- 0021-9606
- Volume :
- 128
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- The Journal of chemical physics
- Publication Type :
- Academic Journal
- Accession number :
- 18190204
- Full Text :
- https://doi.org/10.1063/1.2816136