功能石墨烯改性水性聚氨酯及其性能
Preparation and properties of functionalized graphene modified waterborne polyurethane

以氧化石墨烯（GO）为原料，通过聚乙烯亚胺（PEI）接枝改性和水合肼还原，制备出了功能化石墨烯（FG-PEI），并将其与水性UV固化聚氨酯（WPU）乳液复合，制备FG-PEI/WPU复合涂层。采用FTIR、XRD、Raman、XPS、SEM、TEM等测试分析表征FG-PEI的结构，测定了FG-PEI的导电性，并考察了FG-PEI在水中的分散性，研究FG-PEI用量对WPU胶膜的力学性能和导电性能的影响及其热稳定性。结果表明，FG-PEI在保持较好水溶性的条件下，其电导率并未明显下降，并随着FG-PEI在WPU基体中用量的增加，WPU胶膜的表面电阻率逐渐降低，拉伸强度不断增加，断裂伸长率降低，经FG-PEI改性后，WPU的热稳定性得到提高。研究表明，FG-PEI改性WPU可提高胶膜的导电性，使其兼具良好的综合性能。 The functionalized graphene(FG-PEI)was prepared from graphite by oxidizing, modifying with poly(ethylene imine) (PEI) and reducing with hydrazine hydrate.The FG-PEI was mixed with UV waterborne polyurethane(WPU) to prepare FG-PEI/WPU composite coating adhesive to modify WPU. The structure of the FG-PEI was characterized by FTIR, XRD, Raman, XPS, SEM, TEM, the dispersibility of the FG-PEI was investigated, the influences of the dosage of FG-PEI on electrical conductivity, and the thermal stability and the mechanical properties of FG-PEI/WPU film were also studied. The results show that FG can be dispersed well in dimethyl formamide and WPU. With the increase of the dosage of FG-PEI, the electrical resistivity of the film decreases and the tensile strength of the film increases, and elongation at break of the film decreases. The thermal stability of WPU is improved after being modified by FG-PEI. The study results show that the modification WPU with FG-PEI can improve the electrical conductivity and water resistance of the film, thus the film has good performance. 国家自然科学基金（51302109）；江苏省自然科学基金（BK20130144）