Aging of a low molecular weight poly(methyl methacrylate)

被引：31

作者：

Casalini, R. ^{[1
]}

Roland, C. M. ^{[1
]}

机构：

[1] USN, Res Lab, Div Chem, Washington, DC 20375 USA

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2011年 / 357卷 / 02期

关键词：

Dielectric relaxation; Glass transition; Poly(methylmethacrylate); DIELECTRIC-RELAXATION; TRANSLATIONAL DIFFUSION; GLASS-TRANSITION; DYNAMICS; LIQUIDS; ALPHA; TEMPERATURE;

D O I：

10.1016/j.jnoncrysol.2010.07.048

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Dielectric relaxation of a low molecular weight PMMA was measured in both the equilibrium and glassy states. The intense beta process, due to motion of the pendant ester moiety, exhibits a change in T-dependence of both its relaxation time and dielectric strength at T(g), reflecting the coupling of this high frequency process to the backbone conformational changes underlying the a dynamics. Consequently, we can exploit the change in the properties of the beta process during physical aging to quantify the alpha relaxation time and its T-dependence for glassy PMMA. The obtained values, T(alpha)>10(4), are too long for direct measurement. Published by Elsevier B.V.

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页码：282 / 285

页数：4

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