采用溶液共混法制备了以多壁碳纳米管(MWCNTs)、六方氮化硼(H-BN)为填料,以聚乙烯醇缩丁醛(PVB)为基底的新型复合材料,通过瞬态电热技术研究了不同填料配比、不同环境温度下复合材料的导热性能。实验结果表明,随着环境温度从290K降低到10K,复合材料的热导率逐渐降低;复合材料的热导率随着MWCNTs含量的增加先增大后减小,且当MWCNTs和H-BN的质量分数比例为5:5时导热系数达到最大值,是纯PVB的两倍。
Novel composites with Multi-walled carbon nanotubes (MWCNTs) and hexagonal boron nitride (H-BN) as fillers and polyvinyl butyral (PVB) as substrate were prepared by solution blending process.The thermal conductivity of the composites with different mass fraction ratio of fillers was investigated by transient electro-thermal technique (TET) under different ambient temperatures.The experimental results showed that the thermal conductivity of the composites gradually decreased as the ambient temperature decreased from 290K to 10K.The thermal conductivity of the composites increase at first and then decreased with the increase of MWCNTs content,and the thermal conductivity reached the maximum value when the ratio of MWCNTs to H-BN was 5:5,which was twice as high as that of pure PVB.
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基金资助
国家重点研发计划项目基金(2019YFE0119900);山东省自然科学基金(ZR2020ME183)
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