Preparation of boron nitride-coated carbon fibers and synergistic improvement of thermal conductivity in their polypropylene-matrix composites

Badakhsh, Arash and Han, Woong and Jung, Sang Chul and An, Kay Hyeok and Kim, Byung Joo (2019) Preparation of boron nitride-coated carbon fibers and synergistic improvement of thermal conductivity in their polypropylene-matrix composites. Polymers, 11 (12). 2009. ISSN 2073-4360 (https://doi.org/10.3390/polym11122009)

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Abstract

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.

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