Abstract
Combined with the advantages of low melting point, high thermal stability and strong acidity, a multiple-SO3H functioned ionic liquid (MIL) was developed successfully as a curing agent to promote the curing reaction of phthalonitrile-terminated poly(phthalazinone ether nitrile) (PPEN-Ph). The curing kinetics over differential scanning calorimetry (DSC) showed that both the initial curing temperature Tp0′ and apparent activation energy Ea’ (based on Kissinger equation) were reduced significantly over MIL (207.9°C and 101.5kJ/mol) compared to the common curing agent ZnCl2 (268.5°C and 201.5kJ/mol). Moreover, under identical curing conditions, the resulting thermosetting resin over former (Td5%=526.1°C) showed better thermal stability than that over latter (Td5%=512.1°C). These results indicated that MIL should be a good candidate as a curing agent for phthalonitrile resins.
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