气体辅助注射成型聚乙烯制品的结晶形态及性能  

Crystalline Morphology and Mechanical Property of Polyethylene Parts Prepared by Gas-assisted Injection Molding

作　　者：张全平[1] 汪龙[1] 张凯[1] 孙囡[1] 张瑞岩[1] 吴敬敬[1] 杨鸣波[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：《中国塑料》2012年第10期70-83,共14页China Plastics

基　　金：国家自然科学基金资助项目(21174092)

摘　　要：介绍了气体辅助注射成型(GAIM)过程中聚乙烯分子参数和成型条件对制品结晶形态的影响以及结晶形态与力学性能之间的关系。GAIM成型过程中熔体短射和气体多次穿透引起的强剪切场使聚乙烯分子链沿流动方向取向,经独特的冷却过程后制品内形成了多层次形态结构。最后结合聚乙烯分子参数和GAIM成型过程探讨了多层次形态结构的形成机理。The effects of polyethylene molecular parameters and processing conditions on crystalline morphology of gas-assisted injection molded （OAIM） polyethylene and relationships between the crystalline morphology and mechanical property were introduced. Due to the enhanced shear fields induced by melt short shot and gas penetration, polymer chains were partially oriented along the flow direction and the hierarchical crystal structures were further formed in parts during the subsequent cooling stage of GAIM process. In this paper, combined molecular parameters of polyethylene with molding process, the formation mechanism of hierarchical morphology during GAIM was explored.

关 键 词：聚乙烯 气体辅助注射成型 力学性能 多层次形态 形成机理 

分 类 号：TQ320[化学工程—合成树脂塑料工业]