改性石墨烯磺化聚苯醚质子交换膜的制备和性能研究-材料学专业论文.docxVIP

暨南大 暨南大学研究生学位论文 II II 3、为了改善石墨烯和 SPPO 的相容性，我们根据相似相容原理，采用重氮盐法，在低 温条件下，使对氨基苯磺酸重氮盐与石墨烯片层上含有活泼氢的基团发生耦合反应，从而 在石墨烯片层的表面引入磺酸基团，最后将改性石墨烯和 SPPO 进行溶液共混浇注成膜。 此法不涉及高温操作，石墨烯片层上的亲水基团可以较为完好的保存；这种改性石墨烯在 溶液中分散时不会受到聚合交联产生的高分子网络的干扰，因此在铸膜溶剂 DMF 中的分 散性较好。1.0% SGO/SPPO 复合膜的拉伸强度为 13.8 MPa，在 90℃的高温下的质子传导 率达到了 0.0402 S·cm-1，相比纯膜均有不同程度的提高。 关键词：磺化聚苯醚，石墨烯，AMPS，重氮盐，质子交换膜，质子传导率 III III ABSTRACT Fuel cell has been attracted wide interests with outstanding advantages of zero discharge, eco-friendly property, high energy conversion rate, durable property, high energy density and so on. The proton exchange membrane is core part of the cell, which is a challenge in this field. And now, some series have been industrialized, for example, the Nafion series membrane of DuPont company, XUS-B204 series membrane of Dow company, the Aciplex series membrane of ASAHI company. Nafion is the most successful product, which is popular and widely used all over the world. Even so, the limits were also existed such as high price, methanol crossover and bad heat resistibility. Scholars proposed two research routes: one is the modification of Nafion membrane, and the other is searching for substitute. On the basis of the preliminary experiment, we choose sulfonated product of poly(phenylene oxide), a kind of cheap engineering plastics, as the matrix of proton exchange membrane. The composite membrane by incorporating the graphene nanosheets into the sufonated poly(phenylene oxide) matrix was prepared for the first time. There are large structure differences between graphene nanosheets and poly(phenylene oxide) backbone, without similar groups, which lead to the organic-inorganic mixture difficulties. In this situation, we take several meathods of graphene surface modification to improve the dispersibility of graphene nanosheets in the sulfonated poly(phenylene oxide) matrix, which is beneficial to enhance the integrated performance of the composite membrane. First, the sulfonated poly(phenylene oxide) was prepared by u