FREE-VOLUME CHANGES IN POLYVINYL ACETATE MEASURED BY FLUORESCENCE SPECTROSCOPY

被引：57

作者：

MEYER, EF

JAMIESON, AM

SIMHA, R

PALMEN, JHM

BOOIJ, HC

MAURER, FHJ

机构：

[1] CASE WESTERN RESERVE UNIV,DEPT PHYS,CLEVELAND,OH 44106

[2] CASE WESTERN RESERVE UNIV,DEPT MACROMOLEC SCI,CLEVELAND,OH 44106

[3] DSM RES BV,GELEEN,NETHERLANDS

来源：

POLYMER | 1990年 / 31卷 / 02期

基金：

美国国家科学基金会;

关键词：

free volume; physical ageing; stress relaxation;

D O I：

10.1016/0032-3861(90)90113-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：

Fluorescence probes dispersed randomly in polyvinylacetate (PVAc) were used to follow changes in the matrix free volume with temperature and during isothermal physical ageing in the glassy state. The emission intensity of Auramine O shows a change in temperature coefficient at the glass transition temperature of PVAc. During isothermal ageing, after a quench from the equilibrium melt, the emission intensity shows a time-dependent increase, interpreted as due to the relaxation of matrix free volume. The change in Auramine O fluorescence intensity with ageing time is compared with the increase in the characteristic time for momentary stress relaxation of PVAc. These properties are found to be qualitatively self-consistent using theoretical arguments based on free volume concepts. © 1990.

引用

页码：243 / 247

页数：5

共 28 条

[11] HIGH-CONVERSION POLYMERIZATION FLUORESCENCE PROBES .1. POLYMERIZATION OF METHYL-METHACRYLATE [J].