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  

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

作　　者：欧阳泽宇 王珂珂 饶琼 张志龙 扶碧波 彭雄奇[1] OUYANG Zeyu;WANG Keke;RAO Qiong;ZHANG Zhilong;FU Bibo;PENG Xiongqi(School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200030,China;AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,China)

机构地区：[1]上海交通大学材料科学与工程学院,上海200030 [2]中国航发湖南动力机械研究所,株洲412002

出　　处：《复合材料学报》2021年第3期722-731,共10页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(11972225)。

摘　　要：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。结果表明,当PEK-C的含量为20wt%时,GNP选择性分布在PEK-C中,形成了双逾渗结构的GNP/(PEK-C-EP)复合材料,从而构建了连续导热通道。当GNP含量为1wt%时,GNP/EP复合材料导热率最高达0.375 W(m·K)^(-1)。当GNP含量为0.5wt%时,GNP/(PEK-C-EP)复合材料导热率最高达0.371 W(m·K)^(-1),较GNP含量为0.5wt%的GNP/EP复合材料热导率高48%,与GNP含量为1wt%的GNP/EP复合材料的热导率基本相同。表明GNP/(PEK-C-EP)复合材料的填料量减少了50%,利用双逾渗效应可以有效减少导热填料用量。此外,比较了纯EP和GNP/(PEK-C-EP)复合材料的玻璃化转变温度、热稳定性和热膨胀系数,结果表明,GNP/(PEK-CEP)复合材料的热性能优于纯EP。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)^(-1)at 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.

关 键 词：双逾渗效应 环氧树脂 酚酞聚芳醚酮 石墨烯纳米片 导热性 

分 类 号：TB332[一般工业技术—材料科学与工程]