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Continuously enhanced hoop strength of rotation-extruded polypropylene pipe via self-assembly β nucleating agent with different aspect ratio

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Abstract

Self-assembling β nucleating agents (TMB-5) and self-designed rotation extrusion device were applied to optimize and control over hoop strength of polypropylene (PP) pipes. By adjusting final heating temperature, TMB-5 efficiently self-assembled into fibrous morphology with controllable aspect ratio, and acted as an oriented template to direct the epitaxial crystallization of PP, into β-crystals with various lamellae-stacking patterns. The obtained structural information clearly demonstrated that enlarging the aspect ratio of TMB-5 could increase the ordering index and packing intensity of lamellae, moreover, impose them transforming from random arrangement to axial-orientation and then to orthogonal orientation. Among them, the anisotropic ones were further guided to align off the axial-direction of PP pipes via rotation extrusion, where the hoop drag flow caused by the mandrel rotation was superposed on the axial flow. As a result, the hoop tensile strength was enhanced monotonously from 21.3 MPa to 30 MPa for the rotation extruded PP pipes with increasing the aspect ratio of TMB-5.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (51303114, 51421061 and 51703182), State Key Laboratory of Polymer Materials Engineering (Grant No. sklpme2016-3-05), Key Scientific Research Fund of Xihua University (Grant No: Z1520103). Shanghai Synchronous Radiation Facility is gratefully acknowledged for providing 2D-WAXD and 2D-SAXS.

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Authors and Affiliations

  1. State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, 610065, China

    Rui Han, Min Nie & Qi Wang

  2. School of Materials Science and Engineering, Xihua University, Chengdu, 610039, China

    Rui Han

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  1. Rui Han
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  2. Min Nie
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  3. Qi Wang
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Correspondence to Min Nie.

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Han, R., Nie, M. & Wang, Q. Continuously enhanced hoop strength of rotation-extruded polypropylene pipe via self-assembly β nucleating agent with different aspect ratio. J Polym Res 24, 204 (2017). https://doi.org/10.1007/s10965-017-1379-0

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  • DOI: https://doi.org/10.1007/s10965-017-1379-0

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