Abstract: The influence of different nucleating agents on the crystallization rate and intrinsic viscosity of poly (ethylene terephthalate) was studied using differential scanning calorimetry (DSC) and Ubbelohde viscometer, respectively. It showed that hybrid nucleating agents（half-crystallization time was 32.3~45.3 s） had advantages over single nucleating agents(half-crystallization time was 42.9~57.9 s) in promoting crystallization, and a few hybrid nucleating agents performed well in reducing the decrease of intrinsic viscosity.

Key words: poly (ethylene terephthalate), nucleating agent, crystallization rate, intrinsic viscosity