The Microstructure and Mechanical Property of Micro-injection Molded HDPE Parts: Effect of Molecular Weight
[1]Shi Suyu,Wang Lina,Xu Wenzhong,et al.The Microstructure and Mechanical Property of Micro-injection Molded HDPE Parts: Effect of Molecular Weight[J].Journal of Zhengzhou University (Engineering Science),2016,37(06):24-27,33.[doi:10.13705/j.issn.1671-6833.2016.03.024]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
37
Number of periods:
2016 06
Page number:
24-27,33
Column:
Public date:
2016-12-31
- Title:
- The Microstructure and Mechanical Property of Micro-injection Molded HDPE Parts: Effect of Molecular Weight
- CLC:
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- Abstract:
- The high density polyethylene ( HDPE ) parts with two different molecular weights were prepared with micro-injection molding. The dependence of microstructure and mechanical properties of samples with dif-ferent molecular weight were examined. Tensile test indicated that the increase to 77. 5% in tensile strength was achieved for HDPE parts with higher molecular weight. At the same time, the toughness of HDPE parts were enhanced about twice as compared with that of lower molecular weight. In this study, microstructure characterizations, including differential scanning calorimetry ( DSC) , wide-angle X-ray diffraction ( WAXD) , small-angle X-ray scattering ( SAXS) and scanning electronic microscope ( SEM) were emplayed/conducted to investigate the variations of microstructure and further established the relationship between microstructure and mechanical properties. It suggested that the increased molecular and crystalline orientation led to the reinforce-ment. Formation of more shish and shish-kebab structure was in favor of the enhanced strength as well. The notable improvement of toughness in the higher molecular weight parts should be ascribed to formate a strong physical crosslinking network.
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