TSC study of length ester side group effect on sub-vitreous relaxations in poly(n-alkyl methacrylates)

被引：14
|
作者：
Dudognon, E [1 ]
Bernès, A [1 ]
Lacabanne, C [1 ]
机构：
[1] Univ Toulouse 3, Lab Phys Polymeres, F-31062 Toulouse 04, France
来源：
POLYMER | 2002年 / 43卷 / 19期
关键词：
thermo-stimulated currents; poly(n-alkyl methacrylates); dielectric relaxations;
D O I：
10.1016/S0032-3861(02)00395-6
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 comparative study by thermo-stimulated currents (TSC) of three poly(n-alkyl methacrylates) is performed. TSC complex spectra exhibit two dipolar relaxations considered in the following: the glass relaxation and a secondary relaxation related to motion of ester side groups. For each sample, the fractional polarisations protocol is applied to describe the fine structure of these complex spectra. It allows us to define the evolution of activation parameters with temperature. The influence of side chain architecture is then considered. It emphasises that the P mode is independent of the ester group length. On the contrary, the a mode is highly sensitive to structural change. These results are finally explained in terms of molecular mobility. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：5175 / 5179
页数：5
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