溶剂热法制备十二胺改性的氧化石墨及其表征

为了改善氧化石墨的亲油性,获得能够在有机溶剂甲苯中稳定分散的氧化石墨,以改进的Hummers法制备的氧化石墨胶体为前躯体,通过溶剂热法,在不同的反应条件下用十二胺对氧化石墨进行改性,制备了疏水的功能化氧化石墨.采用X射线衍射、紫外-可见分光光度计、红外光谱、拉曼和接触角测试对所得产物进行表征,考察了反应条件对产物结构及疏水性的影响.结果表明:经十二胺处理后氧化石墨的—COOH能与十二胺中的胺基发生反应,生成酰胺基团;在120℃,3h溶剂热条件下经过十二胺处理后的氧化石墨表现出了较好的疏水性,能均匀分散在甲苯中,真空抽滤获得的氧化石墨薄膜接触角由未处理前的16.9°提高到101.7°.

Preparation and characterization of dodecylamine modified graphite oxide via solvothermal method

In order to improve the lipophilic of graphite oxide and obtain stable dispersion in toluene,graphite oxide was prepared by improved Hummers method.Hydrophobic functionalized graphite oxide was prepared with different reaction conditions via solvothermal method using graphite oxide as precursor and dodecylamine(DDA) as modification reagent.The samples were characterized by X-ray diffraction(XRD),UV-Vis instrument,Fourier transform infrared spectroscopy(FT-IR)、Raman spectra and contact angle measurements.The effects of reaction conditions on the product structure and the hydrophobic effect were investigated.The results show that carboxyl groups are reacted with DDA to generate amide groups.The modified graphite oxide prepared at 120 ℃ for 3 h can be uniformly dispersed in toluene.The contact angle of the modified graphite oxide film prepared by vacuum filtration is increased from 16.9° to 101.7°.