| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 828563 | Materials & Design (1980-2015) | 2015 | 7 Pages |
•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.
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.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide
