Song Heeseok, Kim Byoung Gak, Kim Yong Seok, Bae Youn-Sang, Kim Jooheon, Yoo Youngjae
Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea.
Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 03722, Korea.
Polymers (Basel). 2019 Mar 13;11(3):484. doi: 10.3390/polym11030484.
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.
在本研究中，使用各向异性氮化硼（BN）以及在聚酰亚胺基体中与球形氮化铝（AlN）或氧化铝（Al₂O₃）颗粒混合的混合填料体系制备了导热复合薄膜。该混合体系使BN复合材料的面内导热率增加，但面外导热率降低，这是由BN的水平排列和各向异性导致的。使用Lewis⁻Nielsen理论预测模型和修正的Lewis⁻Nielsen理论预测模型从理论上探讨了面内导热率的行为。使用BN的单填料体系与理论模型拟合度相对较好。此外，基于两种总体方法（加法和乘法）开发了一种混合体系。这一开发代表了首次实施两种不同的陶瓷导电填料。乘法方法模型得出的导热率值被高估，而加法方法在预测二元填料体系的导热率方面表现出更好的一致性。
