紫外光对PP蠕变行为的影响  

Influence of UV Light on Creep Behavior of Polypropylene

作　　者：刘小林[1,2] 孙世利[3] 陈健[1,2] 刘罡[1] 杨其[2] 李光宪[2] 

机构地区：[1]煤炭科学研究总院重庆研究院矿用新材料研究所,重庆400037 [2]四川大学高分子科学与工程学院,四川成都610065 [3]四川大学建筑与环境学院,四川成都610065

出　　处：《塑料科技》2011年第6期38-42,共5页Plastics Science and Technology

基　　金：国家自然科学基金(50533080)

摘　　要：通过对聚丙烯(PP)施加紫外光的方法研究了紫外光对其蠕变行为的影响,利用蠕变性能测试、GPC、XPS、PALS、SEM等手段考察了紫外光作用下的PP蠕变行为及其失效机理。实验结果表明:紫外光能加速PP的蠕变失效,其失效机理与辐照强度有关;短时间失效主要是由紫外光引起的分子链段的活性变化所致,长时间作用下的失效,主要是紫外光引起的老化导致材料强度的削弱所致;另外,对不同种类的PP,在相同的外部条件(下温度、应力和紫外光,)其失效速率与结构和分子量无关,只与该温度下材料的屈服强度有关,屈服强度越高抗,蠕变能力越好。The effect of UV light on the creep behavior of PP was studied by UV irradiation.The creep behavior and creep failure mechanisms of PP under UV irradiation were studied by creep property test,GPC、XPS、PALS and SEM analysis.It was found that the UV could accelerate creep failure of PP.The failure mechanisms were connected with UV radiation intensity.The short-term failure was mainly caused by the change of the activity of molecular chain;and the long-term failure was due to strength weakness of materials caused by UV.In addition,under the same external conditions（temperature,tensile stress and UV light）,the failure rate for different types of PP had been found to be independent of the structure and molecular weight,depending only on the yield strength at certain temperature,the higher the yield strength was,the slower the failure rate was.

关 键 词：聚丙烯 蠕变行为 紫外光 微观结构 蠕变失效 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]