MOBILITY AND THE DISTRIBUTION OF FREE-VOLUME IN EPOXY NETWORK BY PHOTOCHROMIC LABELING AND PROBE STUDIES

被引：69

作者：

YU, WC ^{[1
]}

SUNG, CSP ^{[1
]}

机构：

[1] UNIV CONNECTICUT,DEPT CHEM,INST MAT SCI,STORRS,CT 06268

来源：

MACROMOLECULES | 1988年 / 21卷 / 02期

关键词：

CHEMICAL REACTIONS - Photochemical Reactions - MOLECULES - PROBES;

D O I：

10.1021/ma00180a013

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Mobility and the free volume environments at different sites of a growing epoxy-diamine network (DGEBA-DDS) have been evaluated by site-specific labeling with azobenzene chromophores. The sites investigated are the cross-linker and the chain end or the dangling chain in the network. We also investigated the free volume of the least constrained region between the network chains by using a free probe not attached to the network. Trans yields cis photoisomerization kinetics of the two labels and the free probe were studied as a function of increasing cure at 160 degree C. Throughout the cure process, the photoisomerization kinetics can be analyzed by two rate processes, suggesting two distinct environments.

引用

页码：365 / 371

页数：7