原位聚合制备聚苯乙烯/石墨薄片纳米复合导电材料

Preparation of PS/Graphite Platelet Conductive Nanocomposite via In-situ Polymerzation

利用超声波粉碎方法将膨胀石墨加工成纳米级厚度的石墨薄片,该石墨薄片厚度为30nm～80nm。通过原位聚合方法使纳米石墨薄片均匀分散于苯乙烯基体中。由于纳米级厚度的石墨薄片具有极大的形状比,它在聚合物基体中形成导电网络具有明显优势。所制备的聚苯乙烯/石墨薄片纳米复合导电材料的渗透滤阀值低于1 0wt%,远低于用普通石墨填充制备的复合材料的6 0wt%。

A process of preparation of PS/graphite nanocomposite was developed via in situ polymerization of monomer in the presence of sonicated expanded graphite with the aid of sonication.Expanded graphite was sonicated to get graphite platelets (NanoG) with thickness of 30nm～80nm.The percolation threshold of polymer/NanoG nanocomposite film at room temperature was lower than 10 wt%,which was much lower than that of the composites with conventional graphite filler, which was 60wt%.The electrically conductivity reached 10-3 S/cm at a graphite content of about 40 wt%.The special structure of graphite platelets with high aspect ratio (widthtothickness) played an important role in forming conducting network within PS matrix.