Characterization of Proton-exchange Membrane with Controlled Intramembrane Structure for Fuel Cell

采用等离子体聚合法制备了固定电荷为丙烯酸或磺酸盐的膜。以聚丙烯（CG）或聚乙烯（HP）微孔膜为基膜，采用气相聚合法制备丙烯酸接枝膜。以三氟甲烷磺酸盐和六氟丙烯为原料，在带内电极的钟罩式等离子体反应器中，通过气相聚合法制备了氟磺酸盐带电膜。操作条件对等离子体压力的影响；射频功率和聚合时间对接枝程度的影响；实验考察了离子交换容量、膜电导率和阳离子转移数。丙烯酸接枝膜具有较高的含水率和导电性。接枝膜在CG膜上的阳离子转移数高于在HP膜上的阳离子转移数。氟磺酸盐接枝膜的电阻率低于nofion117膜，具有与Nafion相竞争的离子交换能力和较高的阳离子转移数。

The membranes having acrylic acid or sulfonate fixed charges were prepared by plasma polymerization. Acrylic acid grafted membranes were prepared by gas phase polymerization in a plasma reactor with outer electrodes and a conjugate liquid vessel, followed by post-polymerization in the liquid phase on the microporous flim of polypropylene (CG) or polyethylene (HP) as a base film. Fluorosulfonate charged-membranes were prepared by gas phase polymerization of both surfaces of the base film in a bell-jar type plasma reactor with inner electrodes, using trifluoromethane sulfonate and hexafluoropropylene. The effects of the operational conditions of plasma pressure ; the RF power and the polymerization period, on the properties of a charged-membrane of the grafting degree ; the ion-exchange capacity, the membrane conductivity and cation transference number, were examined experimentally. Acrylic acid-grafted membranes had high water content, and showed the high membrane conductivity. The transference number of cations of the grafted membrane on the CG film was higher than that of the membrane on the HP film. Fluoro-sulfonate grafted membranes showed the lower resistivity than Nofion 117 membrane, and had the ion-exchange capacity competitive to Nafion and the high transference number of cations.