中文摘要：

聚烯烃膜的整体改性是优化其性能并增加附加值的重要途径之一。常用的方法是在溶液中或者熔融状态下均相共混或接枝，但是对于那些既不溶解亦不熔融的聚合物，非均相法将是最佳的选择。而利用超临界二氧化碳可以将反应单体溶胀进入聚合物基体当中进行聚合反应，生成聚合物共混或接枝聚合物。本文综述了近年来超临界二氧化碳在固相聚烯烃整体接枝改性中的应用，详细介绍了超临界二氧化碳在溶胀聚合和γ射线预辐射诱导接枝聚合中的作用。

英文摘要：

Chemieal modification of pre-existing polymer materials by functional monomers has always been an object of great interest as it offers an effective route to address some low cost commodity shaped-materials to higher added value applications. With the aid of supercritical carbon dioxide, the monomers can be infused into the swollen polymer and polymerized to form heterogeneous polymer alloys. The development of the research on the bulk modification and grafting of polymer in supercritical CO2 is reviewed. In this paper, supercritical CO2-swelling polymerization techniques and （γ）-ray preirradiation-induced graft copolymerization are introduced.