【摘要】 由于石墨烯（Gr）片层之间存在较强的范德华力且聚醚醚酮（PEEK）的熔融黏度大，Gr在PEEK基体中的分散性较差，导致复合材料的性能不能达到理想状态。为了提高Gr在PEEK中的分散性，本文通过乙酸/硝酸的混酸体系对PEEK进行化学改性，得到了PEEK-Aa粉末，然后采用溶液共混法和热压法制备了Gr/PEEK-Aa纳米复合材料。结果表明，Gr/PEEK-Aa纳米复合材料表现出良好的导电性，最大导电率为3.41×10^-4 S/cm,渗流阈值低至0.55vol%。此外，当Gr含量为1wt%时，Gr/PEEK-Aa纳米复合材料具有最佳的综合性能。更多还原

【Abstract】 Due to the strong van der Waals forces between the Gr sheet layers and the high melt viscosity of PEEK, the poor dispersion of Gr in the PEEK matrix leads to the decrease of performance. In order to improve the dispersion of Gr in PEEK, PEEK-Aa powder was obtained by chemical modification of PEEK through the mixed acid of acetic acid/nitric acid, and then Gr/PEEK-Aa nanocomposites were prepared by solution blending and melt hot pressing methods. The Gr/PEEK-Aa nanocomposites exhibited good electrical conductivity with a maximum conductivity of 3.41×10^-4 S/cm and a percolation threshold as low as 0.55vol%. In addition, Gr/PEEK-Aa nanocomposites exhibited the best comprehensive performance when the Gr content was 1wt%.更多还原