DEPENDENCE OF QUASI-ELASTIC LIGHT-SCATTERING IN POLY(METHYL METHACRYLATE) ON THE CONCENTRATION OF FREE MONOMERS

Authors
SUROVTSEV NV MERMET A DUVAL E NOVIKOV VN
Citation
Nv. Surovtsev et al., DEPENDENCE OF QUASI-ELASTIC LIGHT-SCATTERING IN POLY(METHYL METHACRYLATE) ON THE CONCENTRATION OF FREE MONOMERS, The Journal of chemical physics, 104(17), 1996, pp. 6818-6821
Citations number
24
Categorie Soggetti
Physics, Atomic, Molecular & Chemical
Journal title
The Journal of chemical physics → ACNP
ISSN journal
00219606
Volume
104
Issue
17
Year of publication
1996
Pages
6818 - 6821
Database
ISI
SICI code
0021-9606(1996)104:17<6818:DOQLIP>2.0.ZU;2-7
Abstract
The quasielastic light scattering (QELS) of poly(methyl methacrylate) was measured as a function of both temperature and free monomer concen tration, which was varied by heating. The motion responsible for the Q ELS is not thermally activated (i.e., the corresponding relaxation tim e is independent of temperature), while the QELS intensity is strongly temperature dependent and proportional to the monomer concentration. The QELS is interpreted as due to a rapid localized motion released by thermally activated slow structural relaxation, which can create free volume. (C) 1996 American Institute of Physics.