Very fast relaxation in polycarbonate glass

被引：7

作者：

Saviot, L ^{[1
]}

Duval, E

Jal, JF

Dianoux, AJ

机构：

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

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

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

来源：

EUROPEAN PHYSICAL JOURNAL B | 2000年 / 17卷 / 04期

关键词：

D O I：

10.1007/s100510070105

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Relaxations in amorphous bisphenol A polycarbonate are studied by neutron scattering, as a function of temperature below the glass transition. Two different processes are observed. One is very fast, with a characteristic time (similar to 0.3 ps), that is independent of temperature and momentum transfer. Conversely the other is slower, with a time which is dependent on temperature and momentum transfer. The very fast localized anharmonic motion is interpreted by the overdamping of low-frequency vibrational modes, by nearby dynamic holes. The slower relaxation is thermally activated and momentum transfer de pendent. It corresponds to molecular group motions and possibly to the short-time regime of the segmental relaxation.

引用

页码：661 / 666

页数：6

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