聚丙烯接枝改性及其挤出发泡研究

Study on the Graft Modification of Polypropylene and Its Extrusion Foaming

采用过氧化二异丙苯（DCP）为引发剂，苯乙烯（St）为助引发剂，双螺杆挤出机为反应器，使甲基丙烯酸缩水甘油酯（GMA）接技到聚丙烯（PP）链上。通过FT-IR等测试方法对接枝PP的结构和性能进行了研究，结果表明在1727cm^-1处有较为明显的羰基吸收峰；抗熔垂能力的测定表明，接枝反应有效地改善了PP的熔体强度，从而得到适于挤出发泡的聚丙烯接枝改性优化配方：PP100份、GMA8份、DCP0．06份、St3．5份。

The bicomponent-grafted polypropylene was prepared by using of a twin-screw extruder; the grafted reaction was characterized by FT-IR. The influence of the content of initiator and monomer on the melt flow rate, melt strength and anti-sagging ability were studied, and the extrusion foaming was also investigated. Results show that the melt strength and anti-sagging ability were increased, and the performance of the foam was improved effectively.