功能化石墨烯/聚乙烯复合材料薄膜的制备及表征

Preparation and characterization of modified graphene/polyethylene composite films

采用改进Hummers法制备了氧化石墨烯(GO),并采用异佛尔酮二异氰酸酯(IPDI)对GO进行改性,制得功能化氧化石墨烯(IP-GO);再利用水合肼对IP-GO进行还原,制得IP-RGO纳米复合材料。最后通过溶液成型方法制备了IP-RGO/聚乙烯复合材料薄膜。用FT-IR、XRD、XPS、FE-TEM和数字高阻计研究了复合材料薄膜的结构与性能。研究表明,IP-RGO纳米复合材料上保留了异氰酸酯基团,同时GO上的含氧基团大部分被还原,恢复了导电性。IP-RGO以均匀的状态分散在聚乙烯树脂基体中;当IP-RGO添加量为4%时,IP-RGO/聚乙烯复合材料薄膜的体积电阻相比于纯PE体积电阻下降了约7个数量级,抗静电性能得到明显改善。

The graphite oxide was prepared from natural graphite by the modified Hummers method. The GO was modified by isophorone diisocyanate （IPDI） to obtain functionalized graphene oxide （IP GO）, then IP-GO was reduced by using hydrazine hydrate to prepare IP-RGO nanocomposites. The functionalized graphene/PE composite films were subsequently obtained by solution coating method on a coating machine. Structures and properties of the functionalized graphene/PE composite films were characterized by FT-IR, XRD, XPS, FE- SEM and digital megger. The results show that isocyanate groups remain on the IP-RGO, while most of the oxygen-containing groups on GO is reduced, and its electrical conductivity is restored. Meanwhile, the prepared IP-RGO are evenly dispersed in PE matrix. Comparing to pure PE, the volume resistivity of IP-RGO/PE coinposite film is decreased by about seven orders of magnitude when the mass fraction of IP-RGO is 4%, whose antistatic performance improved significantly.