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The role of gas penetration on morphological formation of polycarbonate/polyethylene blend molded by gas-assisted injection molding

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Abstract

Polycarbonate (PC)/polyethylene (PE) blend was molded respectively by short shot (SS) and gas-assisted injection molding (GAIM). In order to investigate the origin of the “skin-core” structure during GAIM process, the morphology of the two parts molded by SS and GAIM, far from skin, was studied. The results indicate that the structure of the SS part (SSP) is similar to that molded by conventional injection molding (CIM), while the structure of the GAIM part (GAIMP) shows an unusual gradient structure. Many coarse, short PC fibrils arise in sub skin, while such fibrils become more well-defined and reduce in number towards core layer. And the PC phase at the non-gate end, experiences more severe deformation than that at the gate end, which is also different from that in CIM parts. In addition, Moldflow 5.1, a commercial simulation package, was employed to determine the flow behaviors during SS and gas penetration processes. The experimental and simulated results indicate that shear rate and cooling rate are significant for the gradient structure formation during GAIM.

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Acknowledgements

The authors gratefully acknowledge the financial support of the grand subject of the National Nature Science Foundation of China (Grant No. 10590351) and the Major State Basic Research Projects (Grant No. 2005CB623808). We also would like to thank Mr. Yu-Xin Liu, Zhen-Hong Liang, Hong-Hua Yang of Henan Xinxiang MEIDA plastics CO., LTD for their generous help in preparing specimens.

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Authors and Affiliations

  1. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, P.R. China

    Guo-Qiang Zheng, Wei Yang, Li Huang, Zhong-Ming Li, Ming-Bo Yang & Bo Yin

  2. National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou, 450002, P.R. China

    Qian Li, Chun-Tai Liu & Chang-Yu Shen

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  1. Guo-Qiang Zheng
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  2. Wei Yang
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  3. Li Huang
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  4. Zhong-Ming Li
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  5. Ming-Bo Yang
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  7. Qian Li
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Correspondence to Ming-Bo Yang.

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Zheng, GQ., Yang, W., Huang, L. et al. The role of gas penetration on morphological formation of polycarbonate/polyethylene blend molded by gas-assisted injection molding. J Mater Sci 42, 7275–7285 (2007). https://doi.org/10.1007/s10853-006-1484-7

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  • DOI: https://doi.org/10.1007/s10853-006-1484-7

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