HIGH SPEED INJECTION MOLDING OF HIGH DENSITY POLYETHYLENE —EFFECTS OF INJECTION SPEED ON STRUCTURE AND PROPERTIES

Kun Jiang; Fei-long Yu; Run Su; Jing-hui Yang; Tian-nan Zhou; Jian Gao; Hua Deng; Ke Wang; Qin Zhang; Feng Chen; Qiang Fu

doi:10.1007/s10118-011-1049-3

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HIGH SPEED INJECTION MOLDING OF HIGH DENSITY POLYETHYLENE —EFFECTS OF INJECTION SPEED ON STRUCTURE AND PROPERTIES

PAPER | Updated：2021-06-21

- HIGH SPEED INJECTION MOLDING OF HIGH DENSITY POLYETHYLENE —EFFECTS OF INJECTION SPEED ON STRUCTURE AND PROPERTIES
- Chinese Journal of Polymer Science Vol. 29, Issue 4, Pages: 456-464(2011)
- Affiliations：
  
  College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
- Author bio：
  
  **Hua Deng (邓华), E-mail: huadeng@scu.edu.cn
  Qiang Fu (傅强), E-mail: qiangfu@scu.edu.cn
- Funds：
- DOI：10.1007/s10118-011-1049-3
  CLC：
- Received：26 May 2010，
  
  Revised：2010-08-23，
  
  Accepted：31 August 2010，
  
  Published：2011
- Accepted：
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Kun Jiang, Fei-long Yu, Run Su, et al. HIGH SPEED INJECTION MOLDING OF HIGH DENSITY POLYETHYLENE —EFFECTS OF INJECTION SPEED ON STRUCTURE AND PROPERTIES[J]. Chinese Journal of Polymer Science, 2011, 29(4): 456-464.
DOI：

Kun Jiang, Fei-long Yu, Run Su, et al. HIGH SPEED INJECTION MOLDING OF HIGH DENSITY POLYETHYLENE —EFFECTS OF INJECTION SPEED ON STRUCTURE AND PROPERTIES[J]. Chinese Journal of Polymer Science, 2011, 29(4): 456-464. DOI： 10.1007/s10118-011-1049-3.

摘要

Abstract

Thin wall samples of high density polyethylene (HDPE) were prepared

via

injection molding with different injection speeds ranging from 100 mm/s to 1200 mm/s. A significant decrease in the tensile strength and Young’s modulus was observed with increasing injection speed. In order to investigate the mechanism behind this decrease

the orientation

molecular weight

molecular weight distribution

melt flow rate

crystallinity and crystal morphology of HDPE were characterized using two-dimensional wide-angle X-ray diffraction (2D-WAXD)

gel permeation chromatography (GPC)

capillary rheometry and differential scanning calorimetry (DSC)

respectively. It is demonstrated that the orientation

molecular weight

molecular weight distribution

melt flow rate and crystallinity have no obvious change with increasing injection speed. Nevertheless

the content of extended chain crystals or large folded chain crystals was found to decrease with increasing injection speed. Therefore

it is concluded that the decrease in tensile properties is mainly contributed by the reduced content of extended chain crystals or large folded chain crystals. This study provides industry with valuable information for the application of high speed injection molding.

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