Synergistic effects of various ceramic fillers on thermally conductive polyimide composite films and their model predictions

Heeseok Song, Byoung Gak Kim, Yong Seok Kim, Youn Sang Bae, Jooheon Kim, Youngjae Yoo

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


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.

Original languageEnglish
Article number484
Issue number3
Publication statusPublished - 2019 Mar 1

Bibliographical note

Funding Information:
This work was supported by a grant from the KRICT General Research Program (SI1803-03) funded by the Ministry of Trade, Industry & Energy of Korea and also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2017R1A2A2A05069858). This research received no external funding.

Publisher Copyright:
© 2019 by the authors.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Polymers and Plastics


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