石墨烯纳米片/(酚酞聚芳醚酮-环氧树脂)双逾渗导热复合材料的制备和性能

为在较低的导热填料含量下提高环氧树脂(EP)的热导率,通过溶液法制备了石墨烯纳米片/(酚酞聚芳醚酮-EP) (GNP/(PEK-C-EP))复合材料.基于接触角测量计算并预测了GNP的选择性分布,并通过SEM和激光闪光法研究了GNP和PEK-C含量对GNP/(PEK-C-EP)复合材料的微观结构和热导率的影响.结果 表...

Preparation and properties of thermally conductive grapheme nanoplates/(polyetherketone cardo-epoxy)composites with double percolation structures

To improve the thermal conductivity of epoxy(EP)with a lower thermally conductive filler content,graphene nanoplates/(polyetherketone cardo-EP)(GNP/(PEK-C-EP))composites were prepared by the solution method.The selective distribution of GNP was predicted by calculation based on contact angle measurements,and the effects of GNP and PEK-C contents on the microstructures and thermal conductivities of GNP/(PEK-C-EP)composites were investigated by SEM and laser flash method.The results show that double percolation structures are formed in GNP/(PEK-C-EP)composites as the content of PEK-C reaches 20 wt%,where GNPs are selectively distributed in PEK-C to build continuous heat conduction paths.For GNP/EP composites,it reaches the highest thermal conductivity of 0.375 W(m·K)^-1at 1 wt%GNP.While for GNP/(PEK-C-EP)composites,the content of 0.5 wt%GNP reaches highest thermal conductivity of 0.371 W(m·K)^-1,which is 48%higher than that of GNP/EP composites at0.5 wt%GNP content and basically the same as that of GNP/EP composites at 1 wt%GNP.It indicates that the filler content of GNP/(PEK-C-EP)composites is reduced by 50%owing to the double percolation effect.In addition,the glass transition temperatures,thermal stability and coefficients of thermal expansion of pure EP and GNP/(PEK-CEP)composites were compared.The results show that the GNP/(PEK-C-EP)composites are superior to pure EP in thermal properties.