Network formation in the free-radical copolymerization of a bismaleimide and styrene

被引:32
作者
Dusek, K [1 ]
Matejka, L [1 ]
Spacek, P [1 ]
Winter, H [1 ]
机构
[1] DSM RES BV,6160 MD GELEEN,NETHERLANDS
关键词
bismaleimide; styrene; network formation;
D O I
10.1016/0032-3861(96)85869-1
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Network formation during copolymerization of styrene with a model bismaleimide, p-maleimidobenzoic anhydride, or with mixtures of p-maleimidobenzoic anhydride and methyl p-maleimidobenzoate was studied. The concentrations of pendent double bonds in copolymers, calculated from the consumption of monomers and copolymer composition, follow the general trend typical for vinyl-divinyl copolymerizations. A substantial fraction of pendent maleimide bonds remains in the system at the end of polymerization. The gel point conversions are much higher than for ring-free copolymerizations due to cyclization and steric hindrance of pendent double bonds. The gel point conversions increase with increasing content of the monomaleimide in the copolymerization mixture reaching 100% at 4 mol% of bismaleimide (12 wt% solution). The gel point conversions also increase with increasing dilution reaching 100% for the bismaleimide polymerization in 3 wt% solution. The steric hindrance effect on pendent double bond reactivity seems to be somewhat higher than for conventional vinyl-divinyl copolymerizations. Copyright (C) 1996 Published by Elsevier Science Ltd.
引用
收藏
页码:2233 / 2242
页数:10
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