Quasielastic scattering and fast localized relaxation in poly(methyl methacrylate) glass

被引：17

作者：

Duval, E ^{[1
]}

Mermet, A

Surovtsev, N

Jal, JF

Dianoux, AJ

机构：

[1] Univ Lyon 1, Lab Physicochim Mat Luminescents, CNRS, URA 5620, F-69622 Villeurbanne, France

[2] Univ Lyon 1, Dept Phys Mat, CNRS, URA 5586, F-69622 Villeurbanne, France

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

来源：

PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES | 1998年 / 77卷 / 02期

关键词：

D O I：

10.1080/13642819808204973

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In poly(methyl methacrylate) glass at temperatures much lower than the glass transition temperature, one observes quadielastic light or neutron scattering. The corresponding relaxation time is short (about 4 x 10(-12) s) and weakly dependent on temperature. Conversely the intensity of quasielastic scattering is strongly temperature dependent. It is found that this intensity and the mean square displacement due to anharmonic motions have the same temperature dependence as that of the hole volume fraction, which is determined by positron annihilation lifetime spectroscopy. The relation between the slow relaxation, which is responsible for the dynamic hole volume fraction, and the localized fast relaxation, is emphasized.

引用

页码：457 / 461

页数：5

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