反应挤出法制备LLDPE-g-(GMA-co-St)的研究

Study of Grafting of GMA onto LLDPE by Reactive Extrusion

以甲基丙烯酸缩水甘油酯(GMA)为接枝单体,苯乙烯(St)为接枝共单体,在双螺杆挤出机上对线型低密度聚乙烯(LLDPE)进行熔融接枝,制备了LLDPE-g-(GMA-co-St)。研究了引发剂用量、单体用量、共单体用量和抑交联剂亚磷酸三苯酯等对LLDPE接枝物接枝率和熔体质量流动速率的影响,利用红外光谱对接枝物进行了表征。研究表明,St的加入能有效提高GMA的接枝率,亚磷酸三苯酯有效抑制了LLDPE的交联。最佳配方为:过氧化二异丙苯(DCP)为0.15份,GMA为3份,St为3份,亚磷酸三苯酯为1份。

With GMA as graft monomer and St as graft comonomer, LLDPE-g-（GMA-co-St）was prepared by melt grafting on a twin screw extruder. The effects of the contents of DCP, GMA, St and triphenyl phosphate on the grafting yield and melt flow rate were studied. The graft polymer was characterized by means of FT-IR. The results showed the grafting yield was effectively increased by adding St; the crosslinking of LLDPE was decreased significantly due to the addition of triphenyl phosphite. The optimum recipe was DCP 0.15 phr, GMA 3 phr, St 3 phr and triphenyl phosphate 1 phr.