导热绝缘h-BN/MVQ/EVA复合材料的双逾渗效应

doi:10.11896/j.issn.1005-023X.2017.07.021

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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.

Key words： thermal conductivity double percolation dielectric property h-BN/MVQ/EVA electrical insulation

Published: 08 May 2018

CLC number:

TB33

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	Articles by authors
	YANG Wenbin
	ZHANG Kai
	LIAO Zhiqiang
	CHENG Jinxu
	XIE Changqiong
	WU Juying
	FAN Jinghui

Cite this article:

YANG Wenbin,ZHANG Kai,LIAO Zhiqiang, et al. Double Percolation Effect in Thermally Conductive and Electrically Insulating h-BN/MVQ/EVATernaryComposite*[J]. Materials Reports, 2017, 31(7): 137-142.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.07.021 OR http://www.mater-rep.com/EN/Y2017/V31/I7/137

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