Abstract: A series of poly(1,3-propylene glycol-hexanedioic acid)-functionalized hydroxyl carbon nanotubes(PHHCNTs) were prepared byin situpolymerization using hydroxyl carbon nanotubes(MWNT-OH),1,3-propylene glycol and hexanedioic acid as reactants and butyl titanate as catalyst.Thermogravimetry analysis results show that the polyester chain length grafted onto to CNTs decreases with increasing catalyst contents.The melting and non-isothermal crystallization behaviors of PHHCNTs were examined using differential scanning calorimetry(DSC).The crystallizing temperatures of PHHCNTs decrease with increasing cooling rate for a given catalyst content and increase with catalyst content for a given cooling rate.The higher the catalyst content,the lower the degree of supercooling of crystallization of PHHCNTs.Jeziorny method accurately describes the non-isothermal crystallization processes of PHHCNTs.