无规共聚聚丙烯中β－晶的增韧作用

摘要

In order to improve the impact strength of polypropylene random copolymer (PPR),the calci-um pimelate nucleated PPR,nano-CaCO3 and calcium pimelate-supported CaCO3 filled PPR were pre-pared.Their mechanical properties,crystallization behavior and the content of β-modification were stud-ied using mechanical testing,differential scanning calorimetry,wide-angle X-ray diffraction and scanning electron microscopy.The effect of calcium pimelate,nano-CaCO3 and calcium pimelate-supported CaCO3 on the impact strength,elongation at break,crystallization temperature and β-modification contents of PPR were investigated.The result indicated that using supported β-nucleating agent was an efficient method to increase the β-modification contents and improve the toughness of PPR.%为提高无规共聚聚丙烯（PPR）冲击强度，制备了庚二酸钙成核 PPR 和纳米碳酸钙与负载庚二酸钙的纳米碳酸钙填充 PPR，采用力学性能测试方法、DSC、XRD 和 SEM对比研究了其力学性能、结晶性能和β－晶含量。讨论了庚二酸钙和纳米碳酸钙及其负载庚二酸钙的纳米碳酸钙对 PPR 冲击强度、断裂伸长率、结晶温度和β－晶含量的影响，指出采用负载型β－成核剂是提高 PPR 韧性的有效方法。