【摘要】 将马来酸酐(MA)、过氧化二异丙苯(DCP)、分散剂和低密度聚乙烯粒料(LDPE)均匀混合,在单螺杆挤出机中挤出反应,得聚乙烯接枝马来酸酐(PE-MA)产品,通过化学法和红外分析可知部分马来酸酐确以化学键连接到聚乙烯分子链上。PE-MA 的接枝率(C_x)和熔体指数(MI)随 DCP、MA、分散剂用量不同而呈规律性变化,分散剂的选择对 G_x 和 MI 有较大的影响。本文根据实验规律提出了熔融挤出反应的反应机理。在接枝反应过程中加入含氮化合物有不良影响,补加引发剂的二次挤出可部分提高 MA 的转化率,增大 PE-MA 的接枝率。更多还原

【Abstract】 It is easy to get polyethylene grafted maleic anhydride product(PE-MA)if a mixture of LDPE granules,maleic anhydride(MA),dicumyl peroxide(DCF)and dispersing agent were added in a single screw extruder,then reac-ted and extruded at 180℃.The degree of grafted MA(Gx)and its melt in-dex(MI)depend upon the proportion of MA,DCP,and dispersing agent.Experiments show that Gx and MI of the PE-MA also are affected by the kindof dispersing agents.It gets bad effect when some nitrogencontaining com-pounds were added in the mixture.更多还原