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In situ microfibrillar morphology and properties of polypropylene/polyamide/carbon black composites prepared through multistage stretching extrusion

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Abstract

Isotactic polypropylene/polyamide/carbon black (PP/PA/CB) composites with microfibrillar morphology were designed and prepared using a multistage stretching extruder with an assembly of laminating-multiplying elements (LMEs). CB was selectively located in PA. With the increase of LME number from zero to seven, the conductive PA/CB phase was found to experience an elongating-breaking-elongating process. This morphological development resulted in the strong dependence of electrical resistivity on the LME number. When no LME was used, PP/PA/CB materials with 2.0, 3.0, or 4.0 wt% (1.0, 1.6, and 2.1 vol%) CB employed were insulators (resistivity: 1010 Ω cm) due to their droplet morphology. With the introduction of LMEs, a conductive network was formed because of the microfibrillation of the conductive PA/CB phase; these materials became conductors (resistivity: 104–106 Ω cm). The percolation threshold can lower to 1.5 wt% (0.9 vol%). The low resisticity and percolation threshold cannot be obtained through the conventional method.

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Acknowledgements

The authors gratefully acknowledge the Special Funds for Major State Basic Research Projects of China (2005CB623800) and the Natural Science Foundation of China (50603016, 50773047, 50933004, and 51073099) for financial support of this work.

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Authors and Affiliations

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

    Xiaojie Sun, Qin Yu, Jiabin Shen, Shengling Gao, Jiang Li & Shaoyun Guo

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  1. Xiaojie Sun
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  2. Qin Yu
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  3. Jiabin Shen
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  4. Shengling Gao
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  5. Jiang Li
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  6. Shaoyun Guo
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Correspondence to Jiang Li or Shaoyun Guo.

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Sun, X., Yu, Q., Shen, J. et al. In situ microfibrillar morphology and properties of polypropylene/polyamide/carbon black composites prepared through multistage stretching extrusion. J Mater Sci 48, 1214–1224 (2013). https://doi.org/10.1007/s10853-012-6862-8

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  • DOI: https://doi.org/10.1007/s10853-012-6862-8

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