Effects of Catalysts on the Polymerization of N-Phenylmaleimide

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  • N-フェニルマレイミドの重合反応に及ぼす触媒の影響

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A detailed investigation on the effects of catalysts on the curing of maleimide resins was conducted using model compounds. N-phenylrnaleimide (PMI) and N, N'-diphenylaspartimide (API) were selected as model compounds.<BR>Without catalyst, PMI was polymerized at a temperature more than 200°C because of slow polymerization rate, and the product was PMI polymer (peak molecular weight by GPC=66,000). On the other hand, in the presence of API, the polymerization of PMI was accelerated a little but the product was PMI oligomer (peak molecular weight =1,000).<BR>Imidazole catalyst (2-ethyl-4-methyl-imidazole) accelerated the polymerization of PMI at 170°C but the product was PMI oligomer (peak molecular weight=1,000) independent of the presence of API.<BR>The catalytic effect of dicumyl peroxide (DCP) was hindered by API. Increasing of API caused lowering the polymerization rate of PMI and the molecular weight of PMI polymer.<BR>The knowledge obtained by model reactions corresponds with the curing behaviour of maleimide resins.

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