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Effect of mandrel rotation speed on morphology and mechanical properties of polypropylene pipes produced by rotational shear

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Abstract

To research the role of mandrel rotation speed on the morphology and mechanical properties of polypropylene (PP) pipes, a self-made rotational shear system (RSS) was applied in this study to manufacture plastic pipes with improved hoop tensile strength through applying hoop shear on the pipes using a rotational mandrel. Morphology study results indicated that different morphologies of the PP pipes were produced when the mandrel rotated at 0 rpm, 2 rpm, 4 rpm, 6 rpm, 8 rpm and 10 rpm. The tensile strength and elongation at break of the pipes were found to increase rapidly with the rotation speed and the properties peaked at 6 rpm. At this speed, the tensile strength and elongation at break increased by 4.1% and 727%, respectively. The high mechanical and thermal performance of the pipe produced at 6 rpm was attributed to the grains begin to refine and the thickness of amorphous region increases throughout the pipe wall.

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Acknowledgment

The work was supported by the National Natural Science Foundation of China (Grant NO.21627804).

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Authors and Affiliations

  1. College of Polymer Science and Engineering, Sichuan University, Chengdu, 610065, China

    Junjun Wu, Zexiang Xie, Hao Yang, Minghao Yang, Kaizhi Shen, Qiang Fu & Xueqin Gao

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  1. Junjun Wu
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  2. Zexiang Xie
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Correspondence to Xueqin Gao.

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Wu, J., Xie, Z., Yang, H. et al. Effect of mandrel rotation speed on morphology and mechanical properties of polypropylene pipes produced by rotational shear. J Polym Res 28, 25 (2021). https://doi.org/10.1007/s10965-020-02366-0

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