低密度聚乙烯的接枝改性  

Modification of LDPE by Grafting

作　　者：于逢源[1] 肖汉文[1] 徐冰[1] 黄世强[1] 

机构地区：[1]湖北大学化学与材料科学学院,武汉430062

出　　处：《应用化学》2005年第7期796-799,共4页Chinese Journal of Applied Chemistry

基　　金：湖北省科技重点攻关项目(2001AA101C34)

摘　　要：采用多组分单体熔融接枝法,以甲基丙烯酸缩水甘油酯(GMA)和苯乙烯(St)作为接枝单体,对低密度聚乙烯(LDPE)进行熔融接枝改性,获得了接枝率为3%的改性低密度聚乙烯。用DSC研究LDPE接枝共聚物的非等温结晶过程,分析了接枝前后LDPE非等温行为的差异,发现LDPEg(StcoGMA)结晶峰(Tc)的峰型变宽且向高温方向移动,Avrami指数n的值在4左右,说明接枝前后的聚乙烯体系成核及生长模式相似。用偏光显微镜观察了结晶的形态。Via the melt-grafted reaction of low density polyethylene(LDPE) with multimonomer, we successfully introduced Glycidyl methylacrylate and Styrene onto the macromolecular chain of LDPE. The grafting (degree) of gLDPE reached to 3% approximately. Two analytic methods were employed to study the different processes of the non-isothermal crystallization for LDPE and gLDPE. Crystal of the grafted LDPE was observed by means of a polarized optical microscope. The investigation showed that compared to that of LDPE, the (crysallization) temperature(T_(c)) of gLDPE has shifted to higher temperature slightly and the range of crystallization temperature has become wider. The exponent n of Avrami equation was about 4, indicating that gLDPE and LDPE have a similar model of non-isothermal crystallization.

关 键 词：低密度聚乙烯 甲基丙烯酸缩水甘油酯 非等温结晶Avrami方程 

分 类 号：O631.1[理学—高分子化学]