A detailed investigation on the effects of catalysts on the curing reactions of the allyl-modified maleimide resin system was carried out by using model reactions. Various products and various degrees of polymerization of N-phenylmaleimide are obtained by changing catalysts (no catalyst, imidazole catalyst, radical catalyst and triphenyl phosphine). The products are identified by NMR spectroscopy. These results suggest that the choice of catalyst could control the crosslinking densities and structures of various maleimnide resins; those factors also relate to the physical and mechanical properties. These results would be useful in maleimide chemistry and its application.
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