马来酸酐熔融接枝聚丙烯及降解机理研究Degradation Mechanisms of Melt-Grafting Maleic Anhydrid onto Polypropylene
傅和青,黄洪,张心亚,陈焕钦
摘要(Abstract)：
用双螺杆挤出机研究了加入助剂和不加助剂的马来酸酐(MAH)对聚丙烯(PP)的熔融接枝改性。采用正交试验优化了熔融接枝工艺条件。用接枝物的熔融流动速率(MI)来表征PP降解程度,系统研究了单体MAH、引发剂过氧化二异丙苯(DCP)和助剂硫代二丙酸二月桂酯(ABX)用量对PP降解的影响。分析了PP降解机理以及助剂ABX抑制PP降解的机理。分析表明PP降解副反应是由引发剂作用下产生的PP大分子自由基和由MAH作用下产生的PP大分子自由基引起的;ABX助剂一方面由于它的供电子基减小了PP发生分子内和分子间自由基的转移反应,类似于负向催化剂的作用,降低了PP降解,另一方面降低了MAH激态分子的活性,也降低了PP的降解。
关键词(KeyWords)： 聚丙烯;马来酸酐;ABX助剂;降解机理;熔融接枝
基金项目(Foundation):
作者(Author): 傅和青,黄洪,张心亚,陈焕钦
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