GMA熔融接枝聚丙烯的研究

Investigation on Melt Grafting of GMA onto Polypropylene

以甲基丙烯酸缩水甘油酯（ＧＭＡ）为接枝单体，过氧化二异丙苯（ＤＣＰ）为引发剂，对聚丙烯（ＰＰ）进行了熔融接枝，在烃链上引入极性基团，以改善聚丙烯与极性聚合物的相容性。系统地研究了温度、时间、聚丙烯粒径、反应物组成及加料方式、反应器形式等因素对接枝率的影响。实验结果表明，双螺杆挤出机是接枝效率最高的反应器，接枝物阻碍了聚丙烯β晶型的生成，并提高了热稳定性。

The melt grafting of glycidyl methacrylate (GMA) onto polypropylene (PP) using dicumyl peroxide (DCP) as a radical initiator has been performed in internal mixer,single screw extruder and twin screw extruder.The grafting products were characterized by FTIR,TG and WAXD.The influence of some reaction conditions and of the composition of the reaction mixture on the degree of grafting has been investigated.The degree of grafting was measured by soapinification of ester group in the PP g GMA samples.The degradation of PP was indirectly monitored by means of torque analysis.The results show that twin screw extruder was the best reactor for melt grafting of GMA onto PP.The grafting product hindered β crystallization and improved heat stability of PP.