Abstract
The thermal stabilities of polymaleimide (PMI), poly( N-methyl maleimide) (PMMI), poly( N-ethyl maleimide) (PEMI), poly( N-n-propyl maleimide) (PNPMI) and poly( N-isopropyl maleimide) (PIPMI) were studied over the temperature range 300° to 400°C under a constant flow of nitrogen. At the initial stage of degradation the following results were obtained: (1) the main chain of PMMI is the most stable among the poly( N-alkyl maleimides); (2) the weight loss of PEMI, PNPMI and PIPMI is larger than that of PMI and PMMI; (3) the five-membered imide of PMI is the most unstable among the poly( N-alkyl maleimides); (4) the crosslinkages are formed more easily in PMI and PMMI than in PEMI, PNPMI and PIPMI.
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