The effects of molecular weight(M η) on the crystallization and melting of nylon 1010 have been studied by DSC.With the M η increasing

the initial temperatures of crystallization of the samples with different molecular weight are near a constant (178℃);the peak

finish temperatures decreased almost linearly

and the degree of supercooling and the temperature ranges of crystallization increased linearly.The crystallization heat

entropy and crystallinity decreased quickly when M η4

and steady decreased linearly when Mη>104.The relation of melting are higher than that in the crystallization.