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Role of gas delay time on the hierarchical crystalline structure and mechanical property of HDPE molded by gas-assisted injection molding

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Abstract

The relationship among the processing parameters, crystalline morphology, and macroscopic properties in injected molded bar becomes very complicated due to existence of temperature gradient and shear gradient along the sample thickness. To enhance the shear strength, gas-assisted injection molding (GAIM) was utilized in producing the molded bars. The aim of our research was to explore the relationship between processing conditions and the spatial variation of the hierarchy structure as well as the mechanical properties of high-density polyethylene (HDPE) obtained via GAIM. In our previous work [Wang L, Yang B, Yang W et al (2011) Colloid Polym Sci 289:1661–1671], we found that the enhancement of the gas pressure can remarkably increase the degree of molecular orientation in the HDPE samples, which turns out to improve the mechanical performances of GAIM parts. In this work, the hierarchy structure, orientation behavior, and mechanical properties of molder bars under different gas delay time were investigated using a variety of characterization techniques including rheological experiments, scanning electron microscope, tensile testing, differential scanning calorimetry, and two-dimensional wide-angle X-ray scattering. Moreover, the temperature field during the short shot stage of GAIM process was simulated using an enthalpy transformation approach. Our results indicate that these properties were intimately related to each other, and with prolonged gas delay time, GAIM samples with higher degree of orientation and improved mechanical properties were obtained.

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Acknowledgment

This work is financially supported by the National Natural Science Foundation of China (grant nos. 20874066 and 51033003). The authors also thank Mr. Chao-liang Zhang for his kind assistance in morphological observations. In particular, Mr. Guo-qiang Pan from the NSRL of USTC is gratefully acknowledged for the 2d-WAXS experiments.

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Authors and Affiliations

  1. College of Polymer Science and Engineering, and the State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, People’s Republic of China

    Long Wang, Bin Yang, Nan Sun, Kai Zhang, Jian-Ming Feng & Ming-Bo Yang

  2. College of Chemistry and Chemical Engineering, Anhui University, Hefei, 230039, People’s Republic of China

    Bin Yang

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  1. Long Wang
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  2. Bin Yang
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  3. Nan Sun
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  4. Kai Zhang
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  5. Jian-Ming Feng
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  6. Ming-Bo Yang
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Correspondence to Ming-Bo Yang.

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Wang, L., Yang, B., Sun, N. et al. Role of gas delay time on the hierarchical crystalline structure and mechanical property of HDPE molded by gas-assisted injection molding. Colloid Polym Sci 290, 1133–1144 (2012). https://doi.org/10.1007/s00396-012-2610-5

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  • DOI: https://doi.org/10.1007/s00396-012-2610-5

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