等规聚丙烯在户外老化过程中化学重结晶作用和自由体积变化的研究  

Investigation on Chemi-recrystallization and Free Volume Changes of Isotactic Polypropylene during Outdoor Weathering

作　　者：倪凯[1] 廖霞[1] 赵雪燕[1] 李光宪[1] 

机构地区：[1]四川大学高分子科学与工程学院,四川大学高分子材料工程国家重点实验室,四川成都610065

出　　处：《塑料工业》2015年第7期69-72,共4页China Plastics Industry

基　　金：国家自然科学基金(51133005)

摘　　要：研究了等规聚丙烯在户外老化过程中化学重结晶作用和自由体积的变化。化学重结晶作用促使等规聚丙烯结晶度增加,无定形区分数减少。结晶度的增加降低了无定形区分子链的活动能力,导致自由体积孔洞尺寸缩小,同时无定形区分数减少导致自由体积孔洞数量减少,两者的共同作用导致等规聚丙烯自由体积分数减少。This study investigated the chemi-recrystallization and free volume changes of isotactic polypropylene during outdoor weathering. Chemi-recrystallization increased the polypropylene and decreased the amorphous fraction. The increase in crystallinity led amorphous molecules, causing the shrinkage of free volume holes. And the number decreased due to the reduction of amorphous volume. The two effects resulted in the free volume. crystallinity of isotactic to the loss of mobility of of free volume holes was decrease of the fractional

关 键 词：聚丙烯 老化 化学重结晶 自由体积 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]