论文部分内容阅读
以大尺寸大孔径SiO2为模板,通过丙烯腈溶液浸渍、原位聚合、溶剂蒸发制备出聚丙烯腈(PAN)/SiO2复合物,再经800℃真空炭化处理得到大尺寸大孔径的C/SiO2复合材料。用SEM、FTIR、XPS和粉末XRD对样品结构进行表征。结果表明:SiO2模板特有的毛细管效应使复合物中PAN以薄膜形式包覆在SiO2材料的三维薄层上,且PAN膜的厚度可以通过调整聚合溶液中丙烯腈浓度及聚合物填充次数进行控制,炭膜的厚度与C/SiO2复合材料的表观电导率呈现一定的依赖关系。当聚合溶液中丙烯腈质量分数为33%时,经过两次原位聚合,所得到的C/SiO2复合材料的体积电阻为16Ω.cm,炭膜的平均厚度为16 nm,比表面积约为93 m2.g-1。
Large size large pore size SiO2 was used as template to prepare polyacrylonitrile (PAN) / SiO2 composite by impregnation with acrylonitrile, in-situ polymerization and solvent evaporation. Composites. The structure of the samples was characterized by SEM, FTIR, XPS and powder XRD. The results show that the special capillary effect of SiO2 template can make the PAN thin film be coated on the three-dimensional thin layer of SiO2 material, and the thickness of PAN film can be controlled by adjusting the concentration of acrylonitrile in polymer solution and the filling times of polymer, The thickness of carbon film and the apparent conductivity of C / SiO2 composites show a certain dependence. When the mass percent of acrylonitrile in the polymerization solution is 33%, the volume resistivity of the obtained C / SiO2 composite is 16 Ω · cm after two in situ polymerization, the average thickness of the carbon film is 16 nm and the specific surface area is about 93 m2.g-1.