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Preparation of Boron Nitride-Coated Carbon Fibers and Synergistic Improvement of Thermal Conductivity in Their Polypropylene-Matrix Composites

1
Research Laboratory for Multifunctional Carbon Materials, Korea Institute of Carbon Convergence Technology, Jeonju 54853, Korea
2
Department of Mechanical Design Engineering, Chonbuk National University, Jeonju 54896, Korea
3
Department of Organic Materials and Fiber Engineering, Chonbuk National University, Jeonju 54896, Korea
4
Department of Environmental Engineering, Sunchon National University, Sunchon 57922, Korea
5
Department of Carbon and Nano Materials Engineering, Jeonju University, Jeonju 55069, Korea
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(12), 2009; https://doi.org/10.3390/polym11122009
Received: 13 October 2019 / Revised: 29 November 2019 / Accepted: 2 December 2019 / Published: 4 December 2019
(This article belongs to the Special Issue Carbon Materials Modified Polymeric Composites)
The purpose of this study is to prepare boron nitride (BN)-coated carbon fibers (CF) and to investigate the properties of as-prepared fibers as well as the effect of coating on their respective polymer–matrix composites. A sequence of solution dipping and heat treatment was performed to blanket the CFs with a BN microlayer. The CFs were first dipped in a boric acid solution and then annealed in an ammonia–nitrogen mixed gas atmosphere for nitriding. The presence of BN on the CF surface was confirmed using FTIR, XPS, and SEM analyses. Polypropylene was reinforced with BN–CFs as the first filler and graphite flake as the secondary filler. The composite characterization indicates approximately 60% improvement in through-plane thermal conductivity and about 700% increase in the electrical resistivity of samples containing BN-CFs at 20 phr. An increase of two orders of magnitude in the electrical resistivity of BN–CF monofilaments was also observed.
Keywords: carbon fiber; boron nitride; coating; polymer–matrix composites; thermal properties; electrical resistivity carbon fiber; boron nitride; coating; polymer–matrix composites; thermal properties; electrical resistivity
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MDPI and ACS Style

Badakhsh, A.; Han, W.; Jung, S.-C.; An, K.-H.; Kim, B.-J. Preparation of Boron Nitride-Coated Carbon Fibers and Synergistic Improvement of Thermal Conductivity in Their Polypropylene-Matrix Composites. Polymers 2019, 11, 2009.

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