高密度聚乙烯在弱流动场下形成柱状晶体结构  

Formation of Cylindritic Crystalline Structure of HDPE in the Relatively Weak Flow Field

作　　者：张蕾[1] 刘洪[1] 吴显[1] 郭超[1] 张杰[1] 

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

出　　处：《塑料》2012年第2期34-36,共3页Plastics

基　　金：国家自然科学基金(50873072);国家重点实验室专项经费联合资助项目

摘　　要：对纯HDPE与HDPE/MWCNTs复合材料的动态流变行为进行了研究,发现碳纳米管的加入可以使体系的弹性模量和复合黏度迅速增加。利用纯HDPE与HDPE/MWCNTs复合材料黏度的差异,采用压制成型的方法形成一个特殊的流动场,在这种流动场的作用下,HDPE分子链沿流动方向取向而形成一种预有序结构,这种预有序结构将会诱导球晶在其上面成核生长,形成一种柱晶状的结晶结构。The dynamic rheological behavior of the pure HDPE and HDPE/MWCNTs composite was studied in the experiment. It was found that the storage modulus and complex viscosity increased rapidly with increasing the content of MWCNTs. A special flow field was created by using the difference of viscosity between pure HDPE and HDPE/MWCNTs composite in the compression moulding. The molecular chains of HDPE oriented and aligned along the flow direction and formed a preordered molecules structure. The preordered molecules could act as nucleating sites for spherulites. As a result, the spherulites was induced to epitaxial grow and filled the space perpendicular to the preordered molecules, resulting in a supermo]ecular structure of cylindritic crystalline structure.

关 键 词：高密度聚乙烯 复合材料 压制成型 流动场 柱状晶体结构 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]