TSDC study of structural relaxation on polyethylene terephthalate

被引：12

作者：

Benrekaa, N. ^{[1
]}

Gourari, A. ^{[1
]}

Bendaoud, M. ^{[1
]}

Saoud, R. ^{[1
]}

Guerbi, C. ^{[1
]}

机构：

[1] Univ Sci & Technol, Fac Phys, Dept Phys Mat, USTHB, Algiers 16111, Algeria

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2006年 / 352卷 / 42-49期

关键词：

thermally stimulated and depolarization current;

D O I：

10.1016/j.jnoncrysol.2006.02.144

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：

The influence of physical aging processes on the electrical and thermal properties of amorphous polyethylene terephthalate was investigated by means of the thermally stimulated depolarization current (TSDC), differential scanning calorimetry (DSC) and low frequency dielectric methods. A noticeable decrease in polarization and loss factor corresponding to the main alpha relaxation was observed with increasing aging times, especially for aging temperatures ranging from 10 to 20 degrees C below T-g. This behavior is compatible with the free-volume concept, and can be explained by a gradual decrease in segmental mobility following a shift of the relaxation time spectrum of molecular motions to longer time scales. The whole experimental evidence suggests that proper consideration should be given to thermal history and aging effects of polyethylene terephthalate. The thermally stimulated depolarization current was chosen due to its low equivalent frequency, useful to study systems exhibiting multiple relaxations. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：4804 / 4808

页数：5

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