中文摘要：

采用改进的 Hummers法制备了氧化石墨烯（GO），利用超声分散法和流延成膜法制备了具有层状结构的聚乙烯醇/氧化石墨烯（PVA/GO）纳米复合膜。采用红外光谱（FTIR）、透射电镜（TEM）、扫描电镜（SEM）和X射线衍射（XRD）对纳米复合膜的结构进行了表征，同时测试了复合膜的热性能、力学性能和耐水性能。结果表明， GO片层可以均匀地分散在PVA基体中， GO的加入不会影响PVA的结构， GO与PVA通过强烈相互作用，提高了复合膜的热稳定性、耐水性和力学性能。

英文摘要：

The graphene oxide is prepared by modified Hummers method , and the polyvinyl alcohol/graphene oxide（PVA/GO） nanocomposite films with a layered structure simply is prepared by ultrasonic dispersion and film-casting method . T he microstructures of the nanocomposite films are investigated using FTIR ,TEM ,SEM and XRD . The thermal stability ,mechanical properties and water-resistance of the nanocomposite films are also tested . The experimental results indicate that GO sheets are well dispersed in the PVA matrix , and crystalline structure of PVA is not affected by adding GO . Thermal stability , water-resistance and mechanical properties of the nanocomposite films are improved by strong interaction between PVA and GO .