Journal of Polymer Research

, 24:204 | Cite as

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

ORIGINAL PAPER
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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.

Keywords

Polypropylene Rotation extrusion Pipe Orientation Modification 
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Notes

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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© Springer Science+Business Media B.V., part of Springer Nature 2017

Authors and Affiliations

  1. 1.State Key Laboratory of Polymer Materials EngineeringPolymer Research Institute of Sichuan UniversityChengduChina
  2. 2.School of Materials Science and EngineeringXihua UniversityChengduChina

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