塑料科技2013，Vol.41Issue(7)：41-45,5.
近熔点挤出HDPE片材结晶结构的研究
Investigation on Crystal Structure of HDPE Sheets Extruded Near the Melting Point
郑海丽 1赵元旭 1刘忠柱 1郑国强 1刘春太1
作者信息
- 1. 郑州大学材料科学与工程学院,河南郑州450001
- 折叠
摘要
Abstract
The combined effects of the near melting point (NMP) temperature and screw speed on microstructure of the extruded high density polyethylene (HDPE) sheets were characterized by twodimensional wide-angle X-ray diffraction (2D-WAXD),two-dimensional small angle X-ray scattering (2D-SAXS) and differential scanning calorimetry (DSC).The results show that the locally ordered structure maintained near the melting point does not favor orientation of the HDPE sheets when weak shear is applied.However,crystallinity,long period,lamellae thickness of the NMP sheets increase,as compared to that extruded at high temperature.These increments should be ascribed to the fact that the remained ordered structure could significantly enhance the crystallization temperature,thus accelerate the crystallization kinetics,which leaves more time for the NMP melts to further crystallize.Hence,thicker HDPE lamellae or more perfect crystal structure have been obtained in the NMP sheets as well as the increased crystallinity.Meanwhile,the values of crystallinity,long period,lamellae thickness decrease slightly with increasing screw speed.This may be attributed to shorter time when the melt in the barrel was subjected to shear.关键词
近熔点/挤出/高密度聚乙烯/微观结构Key words
Near the melting point/ Extrusion/ HDPE/ Microstructure分类
化学化工引用本文复制引用
郑海丽,赵元旭,刘忠柱,郑国强,刘春太..近熔点挤出HDPE片材结晶结构的研究[J].塑料科技,2013,41(7):41-45,5.
