【摘要】 通过磨盘碾磨制备了PP/石墨复合粉末 ,进一步与PP填充复合制备出PP/石墨系列导电复合材料。SEM表明 ,PP石墨复合粉末呈不规则薄片状形貌 ,PP与石墨相互嵌入 ,形成粘附结构。TEM表明 ,石墨在基体树脂中形成纳米结构 ,石墨片层相互搭接 ,形成导电网络。导电率测定表明 ,磨盘碾磨制备的复合材料有更低的导电渗滤阈值 ,其中油酸钠改性 2 5 0倍膨胀石墨 (YEP2 5 0 )导电渗滤阈值最低 ,仅 0 .5 5 % (体积含量 ,下同 )。当石墨含量在4.2 %时 ,PP/YEP2 5 0复合材料的导电率已达 6.3× 10 -3 s/m。更多还原

【Abstract】 PP/graphite compounding powders were prepared through pan milling, and then a series of PP/graphite composites were made from them. Uniformed PP/graphite compounding powders of PP and graphite imbedded each other was observed as strip flake through SEM. Nanophase structure compounding graphite with matrix PP was observed through TEM. A network of touching strip flake of graphite was formed in the matrix PP. Through pan milling, the electrical percolation thresholds of less 0.55 vol.% in expanded graphite filled PP was obtained, the electrical conductivity of PP/YEP250 composites reaches 6.3×10 -3 s/m when volume content of graphite is 4.2%.更多还原