BRILLOUIN LIGHT-SCATTERING FROM POLY(METHYL METHACRYLATE) TOLUENE CONCENTRATED-SOLUTIONS

被引：8

作者：

BROWN, W ^{[1
]}

SCHILLEN, K ^{[1
]}

JOHNSEN, R ^{[1
]}

KONAK, C ^{[1
]}

DVORANEK, L ^{[1
]}

机构：

[1] CZECHOSLOVAK ACAD SCI, INST MACROMOLEC CHEM, CS-16206 PRAGUE 6, CZECHOSLOVAKIA

来源：

MACROMOLECULES | 1992年 / 25卷 / 02期

关键词：

D O I：

10.1021/ma00028a046

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A Brillouin scattering study of poly(methyl methacrylate)/toluene mixtures at various polymer concentrations and temperatures has been carried out. The temperature dependences of the Brillouin shifts and line widths are qualitatively explained in terms of the relaxation time model. The concentration dependences of the Brillouin data are discussed in light of a theory for Brillouin light scattering from gels proposed by Marqusee and Deutch (M&D). The speed of sound in the network and frictional damping have been evaluated from the Brillouin shifts and line widths, respectively. Although it provides a realistic description of the data at the lower concentrations, the M&D theory breaks down in the vicinity of the line-width maximum, giving values of the frictional coefficient which are too small in this region.

引用

页码：802 / 805

页数：4

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