不同单体熔融接枝聚丙烯性能研究

Study on Property of Multi-monomer Grafted PP by Melt-grafting

采用双螺杆挤出机熔融接枝的方法,研究了多组分体系下不同单体熔融接枝聚丙烯(PP)的性能。结果表明:在共单体苯乙烯、引发剂和PP相同的条件下,接枝物的极性均较未接枝PP的极性增加,不同单体所得接枝物的接枝率不同。不同熔体质量流动速率造成接枝物的加工性能有不同程度的下降。接枝物极性的增加的趋势依次按接枝单体马来酸酐(MAH)、甲基丙烯酸甲酯(MMA)、甲基丙烯酸缩水甘油酯(GMA)递增。这说明GMA接枝聚丙烯对提高PP极性的效果最明显,MMA其次,而MAH则相对较弱。接枝物的偏光显微镜分析发现,接枝支链的生成可以促进PP的异相成核,造成晶粒细化。

The property of multi-monomer melt-grafted PP was studied by means of single-screw extruder. The results showed when same monomer （styrene）, initiator and PP were used, the polarity of the grafted PP was higher than that of the non-grafted PP, and the graft ratio of the grafted PP by different monomer was different. The processability of the grafted PP with different MFR had different decrease. The increasing order of the polarity of the grafted PP was as this sequence： MAH, MMA and GMA, which showed the effect of GMA on the increase of the polarity of the grafted PP was the best, that of MMA the second, and that of MAH was relatively the weak one. The result of the polarized microscope analysis of the grafted PP showed the heterophase crystal nucleation of PP was induced by the formation of graft branched chain, resulted in fine crystal grain.