相对分子质量及其分布对等规聚丙烯性能的影响研究

The Effect of Molecular Weight and Molecular Weight Distribution on Properties of Polypropylene

通过加入DCP来改变等规聚丙烯相对分子质量的大小及分布,研究了等规聚丙烯相对分子质量及其分布对其性能的影响。结果表明:加入DCP后,iPP的相对分子质量降低、分布变窄,促使聚丙烯结晶速度进一步提高,晶体尺寸进一步减小,iPP中的β晶型消失。随iPP的相对分子质量降低、其分布变窄,iPP的力学性能略微下降。

The effect of molecular weight （ Mw ） and molecular weight distribution （MWD） on property of isotactic polypropylene（iPP） was studied by addition of DCP which changed molecular weight and its distribution. The results showed that the crystallization rate of iPP increased,the spherulites size of iPP became smaller further and β phase vanished,which reducing molecular weight and narrowing molecular weight distribution by the addition of DCP. The mechanical property of nucleating iPP decreased slightly with reduced molecular weight and narrowed molecular weight distribution.