Double Percolation Effect in Thermally Conductive and Electrically Insulating h-BN/MVQ/EVATernaryComposite*
YANG Wenbin1,2, ZHANG Kai3, LIAO Zhiqiang1, CHENG Jinxu1,XIE Changqiong1, WU Juying3, FAN Jinghui3
1 State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials, School of MaterialsScience and Engineering,Southwest University of Science and Technology, Mianyang 621010; 2 State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065; 3 Institute of System Engineering, China Academy of Engineering Physics, Mianyang 621010
Abstract: Abstract|Hexagonal boron nitride (h-BN) was added into polymer blends of methyl-vinyl-silicone rubber (MVQ) and ethy-lene-vinyl-acetate copolymer (EVA) to prepare thermally conductive and electrically insulating composites by melt processing me-thod. According to Young’s equation, the wettability coefficient points out that the dispersion of h-BN in EVA is thermodynamically more favorable than in MVQ. The result of SEM showed that h-BN was selectively located in EVA. There existed double percolation effect in h-BN/MVQ/EVA ternary composites, which resulted in promoting for both mechanical properties and thermal conductivity. The thermal conductivity of h-BN/MVQ/EVA composites were related with h-BN content and EVA/MVQ ratio. When EVA content was 30 wt% in the matrix blend, the relatively increased rate of thermal conductivity of h-BN/MVQ/EVA composites was the highest. The tensile strength and the elongation at break were mainly related with the EVA content in polymer matrix. The increa-sing amount of EVA and h-BN in the composites resulted in a decrease in dielectric constant.
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2017, Vol. 31 
