THERMOREVERSIBLE GELATION OF SOLUTIONS OF SYNDIOTACTIC POLY(METHYL METHACRYLATE) IN TOLUENE - A 2-STEP MECHANISM

被引：51
|
作者：
BERGHMANS, M
THIJS, S
CORNETTE, M
BERGHMANS, H
DESCHRYVER, FC
MOLDENAERS, P
MEWIS, J
机构：
[1] KATHOLIEKE UNIV LEUVEN, DEPT CHEM, B-3001 HEVERLEE, BELGIUM
[2] KATHOLIEKE UNIV LEUVEN, DEPT CHEM ENGN, B-3001 HEVERLEE, BELGIUM
来源：
MACROMOLECULES | 1994年 / 27卷 / 26期
关键词：
D O I：
10.1021/ma00104a023
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 thermoreversible gelation of solutions of syndiotactic poly(methyl methacrylate) in toluene has been studied by different experimental techniques. A combination of calorimetric, infrared, fluorescence, light scattering, and theological observations supports the two-step gelation mechanism, proposed in a previous paper. A fast intramolecular conformational change is followed by an intermolecular association. The change in molecular mobility during the gelation process has been followed by H-1 NMR. Further support for the two-step mechanism has been found in the temperature dependence of the fluorescence properties of a probe covalently attached to the polymer chain. Finally, a concentration-temperature diagram for the polymer-solvent system has been constructed;
引用
收藏
页码：7669 / 7676
页数：8
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