甲基丙烯酸缩水甘油酯熔融接枝粉末聚丙烯的研究

MELT GRAFTING OF GLYCIDYL METHACRYLATE ONTO POLYPROPYLENE

对熔融接枝全同粉末聚丙烯进行了研究，接枝单体为含有环氧基的甲基丙烯酸缩水甘油酯，反应器为Ｈａａｋｅ流变仪。用红外光谱法定性确定了接枝的成功，探索出了将接枝产物与三氯乙酸在甲苯中反应后用氢氧化钠反滴定来测定接枝率的方法，并对接枝率和聚丙烯降解的影响因素作了较为全面的研究。结果表明，用混合引发剂时的接枝效果非常好，不仅接枝率高，而且在高的接枝率下。

The melt grafting of glycidyl methacrylate (GMA) to powdered polypropylene (PP) was studied. Grafting degrees were determined by non aqueous back titration of trichloroacetic acid with sodium hydorxide. The influence of GMA concentration, initiator type and concentration on the degree of grafting was evaluated. The type of initiator had a dramatic effect on the degree of grafting. Acrylamide was found to be an effective initiating agent for grafting and to cause slight crosslinking of PP during grafting. Use of mixed initiators resulted in grafted PP with high grafting degree and little degradation or corsslinking of PP.