Citation: 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. 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 shu

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

Received Date: 26 May 2010
Revised Date: 23 August 2010

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 Youngs 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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