Add time:08/12/2019         Source:sciencedirect.com

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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