PHYSICAL AGING IN A THERMOTROPIC LIQUID-CRYSTALLINE POLYMER

被引：11

作者：

BUIJS, JAHM

VROEGE, GJ

机构：

[1] TNO Plastics and Rubber Research Institute, 2600 JA Delft

来源：

POLYMER | 1993年 / 34卷 / 22期

关键词：

LIQUID-CRYSTALLINE POLYMER; PHYSICAL AGING; MECHANICAL PROPERTIES;

D O I：

10.1016/0032-3861(93)90703-D

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The effects of physical ageing on the mechanical properties of a liquid-crystalline copolyester (LCP) were determined. Creep measurements in torsion as a function of ageing time were performed on macroscopically unoriented samples in the temperature range of - 60 to 180-degrees-C. Below the glass transition temperature (T(g) congruent-to 100-degrees-C), the results indicate physical ageing effects analogous to those of flexible polymers. However, the curvature exponent of the compliance as a function of creep time of the LCP is distinctly smaller. Above T(g), physical ageing remains present while additional annealing effects arise. The molecular interpretation of the time dependence of mechanical properties in LCPs cannot rely upon free-volume concepts as in flexible polymers, but might be based on new structural models that were recently introduced.

引用

页码：4692 / 4696

页数：5

共 26 条

[1]

BECHTOLDT H, 1987, MAKROMOL CHEM, V188, P651

[2] ON THE NATURE OF ORDER IN WHOLLY AROMATIC LIQUID-CRYSTALLINE RANDOM COPOLYMERS [J].