低乙烯含量聚丙烯共聚物结晶成核剂研究

利用ＤＳＣ和偏光显微镜等手段研究了部分成核剂对聚丙烯均聚物（ＰＰ）、低乙烯含量聚丙烯共聚物及聚丙烯／聚乙烯（ＰＰ／ＰＥ）共混物结晶行为的影响，结果表明所用成核剂对ＰＰ和改性ＰＰ具有一定的普适性。聚丙烯共聚物中，由于链结构规整性变差，成核剂的作用显得特别突出，而ＰＰ／ＰＥ共混物中，由于成核剂向ＰＥ相迁移而使其对ＰＰ结晶的成核效率降低。

Investigation of Nucleating Agents on Low Ethyl ene Content Polypropylene Copolymer Crystallization

With the Differential Scanning Calormeter (DSC) and Polarized Light Microscope (PLM), the effect of a series of nucleating agents on the low ethylene content polypropylene copolymers and polypropylene (PP)/polyethylene (PE) blends have been studied. It is shown that the nucleating agent which is effective to the crystallization of PP homopolymer is also useful to the crystallization of PP copolymers. In general, the efficiency of nucleating agent in PP copolymer is higher than PP homopolymer, which can be well explained by the difference of regularity of molecular chain between PP copolymer and PP homopolymer. In PP/PE blends, the nucleating agents affect the nucleation of both PP and PE crystallization.