Abstract: The effect of self-seeding nucleation during the crystallization of polyxymethylene(POM) was studied. It showed that the suitable temperature scope for self-seeding nucleation of POM was 165.5 to 167 ℃.The crystallization temperature of POM increased obviously(about 5 ℃) after the self-seeding nucleation. Additionally, the parameters for Avrami and Lauritzen-Hoffman equations were calculated. The test of polarized light microscopy (PLM) showed that the spherulite size decreased markedly. All of the results prove that self-seeding nucleation technique could improve the nucleation efficiency of POM，reduced its crystal particle size, and improved its crystallization temperature and rate.

Key words: polyxymethylene, self-seeding nucleation, crystallization behavior, crystallization kinetics