Enhancing oriented crystals in injection-molded HDPE through introduction of pre-shear. (5th August 2015)

• Record Type: Journal Article
• Authors: Huang, Linxiang; Wang, Zhen; Zheng, Guoqiang; Guo, John Zhanhu; Dai, Kun; Liu, Chuntai
• Is Part Of: Materials & design. Volume 78(2016:Feb.)
• Page Start: 12
• Page End: 18
• Publication Date: 2015-08-05
• Subjects: Pre-shear -- Oriented crystal -- Hierarchical structure; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2015.04.001
• Languages: English
• ISSNs: 0264-1275

Abstract

Graphical abstract: Highlights: Oriented lamellae are formed in core region of injection-molded HDPE upon pre-shear. Skin–core structure of injection-molded HDPE can be steadily suppressed by pre-shear. HDPE part is mechanically enhanced if pre-shear was exerted at lower temperature. Abstract: 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.