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Polymers 2019, 11(3), 484;

Synergistic Effects of Various Ceramic Fillers on Thermally Conductive Polyimide Composite Films and Their Model Predictions

Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea
Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 03722, Korea
Department of Chemical Convergence Materials, University of Science and Technology, Daejeon 34113, Korea
School of Chemical Engineering & Materials Science, Chung-Ang University, Seoul 156-756, Korea
Authors to whom correspondence should be addressed.
Received: 14 January 2019 / Revised: 4 March 2019 / Accepted: 4 March 2019 / Published: 13 March 2019
(This article belongs to the Special Issue Advanced Engineering Plastics)
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In this study, thermally conductive composite films were fabricated using an anisotropic boron nitride (BN) and hybrid filler system mixed with spherical aluminum nitride (AlN) or aluminum oxide (Al2O3) particles in a polyimide matrix. The hybrid system yielded a decrease in the through-plane thermal conductivity, however an increase in the in-plane thermal conductivity of the BN composite, resulting from the horizontal alignment and anisotropy of BN. The behavior of the in-plane thermal conductivity was theoretically treated using the Lewis–Nielsen and modified Lewis–Nielsen theoretical prediction models. A single-filler system using BN exhibited a relatively good fit with the theoretical model. Moreover, a hybrid system was developed based on two-population approaches, the additive and multiplicative. This development represented the first ever implementation of two different ceramic conducting fillers. The multiplicative-approach model yielded overestimated thermal conductivity values, whereas the additive approach exhibited better agreement for the prediction of the thermal conductivity of a binary-filler system. View Full-Text
Keywords: thermal conductivity; binary filler; modeling; polymer composite thermal conductivity; binary filler; modeling; polymer composite

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Song, H.; Kim, B.G.; Kim, Y.S.; Bae, Y.-S.; Kim, J.; Yoo, Y. Synergistic Effects of Various Ceramic Fillers on Thermally Conductive Polyimide Composite Films and Their Model Predictions. Polymers 2019, 11, 484.

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