Long-term physical ageing of amorphous polymers

被引：0
|
作者：
Etienne, S.
David, L.
机构：
[1] Univ Lyon 1, CNRS, UMR 5627, IMP,Lab Mat Polymeres & Biomat, F-69622 Villeurbanne, France
[2] Ecole Mines, CNRS, UMR 7556, Phys Mat Lab, F-54042 Nancy, France
来源：
PHILOSOPHICAL MAGAZINE | 2007年 / 87卷 / 3-5期
关键词：
D O I：
10.1080/14786430600847107
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The dynamic properties of amorphous polymers were investigated during long-term ageing by means of high resolution low-frequency mechanical spectroscopy. Two polymers are considered in this work, namely atactic polystyrene and quenched amorphous poly(ethylene naphthalate). It is shown that during ageing at temperatures higher than that of secondary relaxation, but lower than that of the primary one (if tested at 1 Hz), the strength of the secondary relaxation first increases and then decreases for long ageing times. This phenomenon is explained on the basis of the concepts of the heterogenous cohesion of the amorphous network at the nanomeric scale and the cooperation of molecular motions responsible for the secondary relaxations.
引用
收藏
页码：417 / 424
页数：8
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