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Effect of fiber diameter on thermal properties of short-glass-fiber-reinforced PTFE-based composites

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Abstract

Polytetrafluoroethylene (PTFE) matrix has been reinforced by short glass fiber (SGF) with various diameters (8, 4 and 2 μm) in this experiment, and the effects of fiber diameter on the thermal properties of PTFE-based composites, including thermal resistance index (THRI), thermal conductivity (λ), melting temperature (Tm), coefficient of thermal expansion (CTEz) and high-temperature compression-creep, are investigated. The results show that the thermal properties could be improved with the amount of SGF. However, this could be due to the fact that the packings have been compelled by different compression forces caused by composite shrinkage during preparation, the interface between packing with large diameter and PTFE matrix is significantly different from that of the small one, resulting in the crystallinity (Xc), and THRI of PTFE-based composites decreases with the decreasing fiber diameter. Moreover, the small-diameter fiber is easier to debond from PTFE matrix due to the inferior physical stability of interface, the λ decreases with the decrease of the fiber diameter, while CTEz and creep strain value increases. From XRD analysis, the results of crystallite size revealed that the lamella thickness of composite decreases, which means that the Tm of the PTFE-based composites has also decreased with the decreasing fiber diameter.

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Acknowledgements

This work was financially supported by the Natural Science Foundation of Shandong Province (Grant No. ZR2019YQ24), Natural Science Basic Research Plan in Shaanxi Province of China (Grant Nos. 2014JQ6199, 2015JM5215) and the Qingchuang Talents Induction Program of Shandong Higher Education Institution (Research and Innovation Team of Structural–Functional Polymer Composites).

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Authors and Affiliations

  1. Ministry of Education and Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Science, Northwestern Polytechnical University, Xi’an, 710129, People’s Republic of China

    Yu Zhang, Kaichang Kou & Shuangcun Zhang

  2. Institute of Materials for Energy and Environment, State Key Laboratory of Bio-Fibers and Eco-Textiles, College of Materials Science and Engineering, Qingdao University, Qingdao, 266071, People’s Republic of China

    Guanglei Wu

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  1. Yu Zhang
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Zhang, Y., Kou, K., Zhang, S. et al. Effect of fiber diameter on thermal properties of short-glass-fiber-reinforced PTFE-based composites. J Mater Sci: Mater Electron 31, 10715–10723 (2020). https://doi.org/10.1007/s10854-020-03621-2

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