【摘要】 研究了β晶型聚丙烯/三元乙丙橡胶(EPDM)的力学性能,通过广角X射线衍射和偏光显微镜对聚丙烯的晶型进行了表征。结果表明:β晶型聚丙烯/EPDM具有较高的冲击强度,与未经β晶成核剂处理的PP/EPDM相比,冲击强度提高1～2倍,聚丙烯β晶增韧和EPDM增韧具有加和效应;β晶型聚丙烯/EPDM的拉伸强度稍低于未经β晶成核剂处理的PP/EPDM;β晶型聚丙烯与α晶相比,球晶尺寸显著降低,晶界模糊,EPDM在其中分散更为均匀。更多还原

【Abstract】 The polypropylene/EPDM blends were studied using WAXD and PLM. It was found that the Izod notched impact strength based on β-form PP was 1～2 times higher than that based on α-form, however, the tensile strength was somewhat lower. The β-form crystallites were smaller than that of α-ones and possessed more smeared boundary between the spherulites. EPDM was more finely dispersed in β-form PP than in α-form.更多还原