中文摘要：

模拟直接甲醇燃料电池（DMFC）的工作条件，通过压力驱动产生的电位变化，对Nation系列质子交换膜进行了电渗系数的测量，在0．5mol／L HSO4中的测量结果与原子示踪法和毛细管电泳法的结果基本吻合。H2SO4浓度越高，膜的溶胀率越低；当H2SO4浓度高于0．5mol／L时，膜的含水率随平衡浓度升高的变化不大；膜的厚度影响分子扩散，当厚度下降到50μm（Nation 112膜）时，质子交换膜由于出现更多贯穿膜厚度方向的扩散通道而体现为非均场扩散的特性。

英文摘要：

The electro-osmotic drag coefficients of series of Nation proton exchange membranes were measured by potential difference generated by the pressure force of the working condition which was similar to that of direct methanol fuel cell （DMFC）. The measurement results in 0.5 mol/L H2SO4 were similar to the results obtained by Atomic Radiotracer method and Capillary Electrophoresis method. The swelling ratio of membranes decreased when the H2SO4 concentration increased. The water content of membranes had little change with the increasing of equilibrium concentration when the concentration of H2SO4 was higher than 0.5 mol/L. The thickness of membrane had some effect to molecular diffusion, when the thickness decreased to 50μm （Nafion 112 membrane）, the proton exchange membrane showed heterogeneous diffusion behavior due to the appearance of diffusion path through the membrane in the thickness direction.