CAJ | 학술논문

用示差扫描量热仪(DSC)和广角x射线衍射法(WAXD)研究了不同分子量聚丙烯β晶相的结晶和熔融行为.不同分子量聚丙烯β晶相均存在一最佳结晶温度.且此温度不随分子量的变化而改变.β晶相的结晶速率、β晶相的相对含量和聚丙烯的结晶度都跟分子量有一定的关系.在同一结晶温度下.低分子量聚丙烯β晶相的结晶速率比高分子量样品快，但其β晶相的相对含量和结晶度却比高分子量样品低.
용시차소묘량열의(DSC)화엄각x사선연사법(WAXD)연구료불동분자량취병희β정상적결정화용융행위.불동분자량취병희β정상균존재일최가결정온도.차차온도불수분자량적변화이개변.β정상적결정속솔、β정상적상대함량화취병희적결정도도근분자량유일정적관계.재동일결정온도하.저분자량취병희β정상적결정속솔비고분자량양품쾌，단기β정상적상대함량화결정도각비고분자량양품저.
The crystallization and melting behavior of β-crystal phase in polypropylene(β-PP) with different molecular weight have been studied by DSC and WAXD techniques. All the four β-PP samples with different molecular weight have a common optimum crystallization temperature. The crystallization rate, relative content of β-crystal phase and the crystallinity of all PP samples were found in relation with the molecular weight of the polymer. With increase in molecular weight, the crystallization rate decreases, while the relative content of β-crystal phase and the crystallinity increase.