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Effect of temperature gradient on the development of β phase polypropylene in dynamically vulcanized PP/EPDM blends

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Abstract

Different sample thicknesses were adopted to investigate the effect of temperature gradient on the development of β phase polypropylene (PP) in the compression-molded dynamically vulcanized thermoplastic elastomers (TPVs) based on PP/ethylene-propylene-diene rubber blend. Differential scanning calorimetry and wide-angle X-ray diffraction were employed to study the melting behavior and crystalline structures. The results indicated that the content of β phase increased with the sample thickness of TPV increasing, while the total crystallinity of PP almost kept constant. The simulation of the temperature field showed that there was a temperature gradient along the direction of sample thickness, and the strength of the temperature gradient increased with the thickness of TPV increasing. The reason for the change of β phase content was found to lie in the reduction of the entropy in the temperature gradient field, which was a result from the decrease of the molecular chain conformation.

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Acknowledgements

The authors gratefully acknowledge the financial support of National Natural Science Foundation of China (grant number 20734005), the Program for New Century Excellent Talents in University (NCET-08-0382), Doctoral Research Foundation granted by the National Ministry of Education, China (grant number 20060610029), the Special Funds for Major Basic Research of China (grant number 2005CB623808), and the support from International Postgraduate Research Scholarship, Australia.

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Authors and Affiliations

  1. Division of Mechanical Engineering, School of Engineering, The University of Queensland, Queensland, 4072, Australia

    Xue-Gang Tang & Meng Hou

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

    Wei Yang, Gui-Fang Shan, Bin Yang, Bang-Hu Xie & Ming-Bo Yang

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  1. Xue-Gang Tang
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  2. Wei Yang
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  3. Gui-Fang Shan
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  4. Bin Yang
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  7. Meng Hou
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Correspondence to Wei Yang or Meng Hou.

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Tang, XG., Yang, W., Shan, GF. et al. Effect of temperature gradient on the development of β phase polypropylene in dynamically vulcanized PP/EPDM blends. Colloid Polym Sci 287, 1237–1242 (2009). https://doi.org/10.1007/s00396-009-2092-2

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  • DOI: https://doi.org/10.1007/s00396-009-2092-2

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