磷酸酯盐类成核剂对煤基抗冲共聚聚丙烯K8708结晶和力学性能的影响研究OA北大核心

The effect of two types of phosphate ester hydroxyaluminum salt nucleating agents,NA-21 and TD-531,on the crystallization process of coal-based impact-resistant copolymerization-type polypropylene(PP)was investigated,re-alizing the regulation of the mechanical properties of the PP.The results indicated that both of the nucleating agents could act as α-Type nucleating agents for the PP to significantly increase its crystallization peak temperature and nucle-ation density,thus accelerating the overall crystallization rate of the PP and improving its rigidity and processing efficien-cy.TD-531 generated a more significant effect on improving the performance of the PP in contrast to NA-21.When the addition amount of TD-531 was only 0.075%,the crystallization peak temperature of the PP increased to 131.8℃,its semi-crystallization time decreased to 0.35 min.Compared to those of pure PP,the crystallization peak temperature in-crease by 10℃and the semi-crystallization time decreased by 5.48 min.Meanwhile,the flexural modulus and impact strength of the PP increased to 1 377 MPa and 68.9 kJ/m2,respectively,which were increased by 330 MPa and 22.3 kJ/m2,respectively,compared to those of pure PP.This demonstrated a good balance between the rigidity and toughness thanks to a good dispersion effectiveness of the nucleating agent.