聚丙烯/三元乙丙橡胶共混体系的研究

研究了三元乙丙橡胶（ＥＰＤＭ）对聚丙烯（ＰＰ）结晶行为的影响以及ＰＰ／ＥＰＤＭ共混物的形态与性能的关系。ＥＰＤＭ对ＰＰ的熔点、结晶温度无明显影响，ＰＰ／ＥＰＤＭ共混物的结晶度随ＥＰＤＭ组份含量的增加而降低，适量的ＥＰＤＭ可使ＰＰ的晶体尺寸减小，晶胞参数与组份比无关。当ＥＰＤＭ用量为３０％～４０％时，共混物的冲击强度迅速提高。

STUDY ON PP/EPDM BLENDS

The effect of EPDM on the crystallization behavior of polypropylene (PP) and the morphology of the blends have been studied by DSC, WAXD, SEM and mechanical propertytest. EPDM shows a slight influence on the melting point, crystallization rate of PP. The degree of crystallinity of PP/EPDM blends decreases with increasing of EPDM content. Proper EPDM can decrease the crystallization size of PP and the unit cell parameters are independent of the blend composition. The impact strength of the blend increases rapidly when EPDM content is at 30% to 40%.