石墨烯/聚氨酯复合材料的合成及表征

Synthesis and Characterization of Graphene/Polyurethane

用Hummers方法成功制备了氧化石墨烯,并对其进行异氰酸酯化改性,最后将改性石墨烯掺杂入由甲苯二异氰酸酯(TDI)和聚乙二醇-600(PEG-600)制备的薄膜之中,得到石墨烯/聚氨酯杂化材料。采用拉曼光谱、傅里叶变换红外光谱、X射线衍射和扫描电镜对杂化材料的结构和性能进行表征,并研究了杂化材料的水接触角及耐酸性能。结果表明,异氰酸酯成功与石墨烯的羟基或羧基反应,增加了氧化石墨烯的不规整性及单片层率。未掺杂氧化石墨烯的聚氨酯薄膜自身水接触角为126°,平衡水含量接近40%。当氧化石墨烯掺杂量为1.5%(质量分数)时,水接触角减小至80°,平衡水含量降至30%,具有"阻路效应"。此薄膜在稀盐酸中浸泡7 d后,其质量损失仅为2.5%。

Graphene oxide was synthesized by the improved Hummers method,treated with isocyanate,and used for preparation of polyurethane（ PU） hybrid films,which was synthesized with tolylene diisocyanate（ TDI） and polyethylene glycol-600（ PEG-600）. The synthesized materials were characterized by Raman spectra,Fourier transform infrared spectrometer,X-ray diffractomer and scanning electron microscope. The results show that the isocyanate could successfully react with the hydroxyl and / or carboxyl groups of graphene oxide. The isocyanate-treated graphene oxide（ i GO） is of more irregularity and has higher monolithic rate than graphite and graphene oxide. The water contact angle and the equilibrium moisture content of the PU film are 126° and 40%,respectively. When 1. 5% i GO is used for the i GO-PU hybrid films,its water contact angle and the equilibrium moisture content decrease to 80° and 30%,respectively. After7 d of immersion in dilute hydrochloric acid,the film mass loss of this i GO-PU hybrid film is only 2. 5%.