Combined with FTIR,DSC characterization and impact strength testing,variations of both crystallinity and carbonyl index of polypropylene(PP)during ultraviolet(UV)aging and their effects on im-pact strength were researched.And this structure activity relationship was further analyzed through equation established.The results show that,with the extending of aging time,the impact strength of PP declines fast with the increase of both crystallinity and carbonyl index firstly,and then slows for the decrease of crystal-linity.With the extending of aging time,the influence of crystallinity on impact strength of PP declines,while that of carbonyl index is on the contrary.The effect of crystallinity on impact strength of PP still can not be ignored while aging time is more than about 325 h.
关键词
聚丙烯/紫外老化/冲击强度/结晶度/羰基指数
Key words
polypropylene/ultraviolet aging/impact strength/crystallinity/carbonyl index
维普
万方数据