Abstract
A detailed investigation on the effect of catalysts on the curing reaction of allyl modified maleimide resins was conducted using model reactions.
Sellecting N-phenylmaleimide (PMI), ο-allylphenol (AP), allylphenylether (APE) and allylbenzoate (AB) as model compounds, the reactions of PMI/AP, PMI/APE and PMI/AB systems were investigated.
Without catalyst, products were 1 : 1 and 3 : 1 adducts of PMI to AP (PMI-AP, (PMI) 3-AP) in the PMI/AP system. Polymerization occurred in the PMI/APE and PMI/AB systems.
Using a radical catalyst (dicumyl peroxide), both PMI-AP, (PMI) 3-AP and polymer were produced in the PMI/AP system. Polymerization occurred in the PMI/APE and PMI/AB systems as the same in those without catalyst.
Using an anionic catalyst such as 2-ethyl-4-methyl-imidazole, or triphenyl phosphine, the product was PMI oligomers in the all systems and allyl compounds reacted little.
From these results, the effect of catalysts on the functionalities of maleimide and allyl groups was considered.
