Influence of molecular orientation direction on the in‐plane thermal conductivity of polymer/hexagonal boron nitride composites

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  • Shusuke Yoshihara
    Frontier Materials Development Laboratories Kaneka Corporation 5‐1‐1, Torikai‐Nishi Settsu Osaka 566‐0072 Japan
  • Masashi Sakaguchi
    Frontier Materials Development Laboratories Kaneka Corporation 5‐1‐1, Torikai‐Nishi Settsu Osaka 566‐0072 Japan
  • Kazuaki Matsumoto
    Frontier Materials Development Laboratories Kaneka Corporation 5‐1‐1, Torikai‐Nishi Settsu Osaka 566‐0072 Japan
  • Masatoshi Tokita
    Department of Organic and Polymeric Materials Tokyo Institute of Technology 2‐12‐1, Ookayama Meguro‐ku Tokyo 152‐8552 Japan
  • Junji Watanabe
    Department of Organic and Polymeric Materials Tokyo Institute of Technology 2‐12‐1, Ookayama Meguro‐ku Tokyo 152‐8552 Japan

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<jats:title>ABSTRACT</jats:title><jats:p>The effect of the molecular orientation direction of a polymer matrix on the in‐plane thermal conductivity (TC) of injection‐molded polymer/hexagonal boron nitride (h‐BN) composites is investigated. In this system, the h‐BN platelets align in the in‐plane direction owing to injection shear flow. Three molecular orientations (perpendicular, random, and parallel to the h‐BN plane) are achieved using liquid crystalline polyesters and the in‐plane TCs are compared. Although a parallel orientation of the polymer chains provides the highest TC of the matrix in the injection direction, the TC of the composites is the lowest of the three systems for this orientation. The highest in‐plane TC is found in the perpendicularly oriented system, irrespective of the in‐plane direction. These results reveal that perpendicularly oriented molecular chains serve as effective heat paths between h‐BN platelets that are arranged one above the other, and consequently, a continuous thermal network is created in the in‐plane direction. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. <jats:bold>2014</jats:bold>, <jats:italic>131</jats:italic>, 39768.</jats:p>

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