Enhancing oriented crystals in injection-molded HDPE through introduction of pre-shear
Enhancing oriented crystals in injection-molded HDPE through introduction of pre-shear
复制标题
通过引入预剪切增强注塑 HDPE 中的定向晶体
DOI：
10.1016/j.matdes.2015.04.001
复制
发表时间：
2015-08-05
影响因子：
8.4
通讯作者：
Liu, Chuntai
中科院分区：
文献类型：
--
作者：
Huang, Linxiang;Wang, Zhen;Liu, Chuntai
在本工作中，预剪切被精心引入熔融HDPE，然后这种预剪切熔体注射成型。采用广角X射线衍射（WAXD）和扫描电镜（SEM）研究了高密度聚乙烯（HDPE）注塑制品的分级结构和结晶形态。结果表明，预剪切能促进HDPE制品芯部取向结晶的形成。更有趣的是，这种增强效果变得更加显着，如果预剪切施加在低温略高于HDPE的熔点。低温预剪切诱导的晶体取向以及剪切区与芯区之间的取向间隙的缩小，使材料的力学性能得到提高。(C)2015爱思唯尔有限公司版权所有。
In the present work, pre-shear was elaborately introduced into melting HDPE and then such pre-sheared melt was injection molded. The hierarchical structure and crystalline morphology of injection-molded HDPE part were investigated by using WAXD and SEM. It was found that pre-shear can enhance the formation of oriented crystals in core region of HDPE part. More interestingly, such enhancing effect becomes more remarkable if pre-shear was exerted at low temperature just slightly above the melting point of HDPE. Naturally, mechanical property was promoted due to the oriented crystals induced by pre-shear at low temperature and the narrowed orientation gap between shear region and core region. (C) 2015 Elsevier Ltd. All rights reserved.