Structure Activity Relationship Analysis of Polypropylene During Ultraviolet Aging Based on Impact Strength
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.
polypropyleneultraviolet agingimpact strengthcrystallinitycarbonyl index
万方数据
维普
