Multiple-SO3H functioned ionic liquid as efficient curing agent for phthalonitrile-terminated poly(phthalazinone ether nitrile)

A multiple-SO3H functioned ionic liquid (MIL) was employed as curing agent of phthalonitrile-terminated poly(phthalazinone ether nitrile) (PPEN-Ph), both the initial curing temperature Tp0′ and apparent activation energy Ea' were reduced significantly over MIL than the common ZnCl2, moreover, the thermal stability of resulting resin was better on former.