The permeability of N-2,H-2 and CO-2 across the membrane were controlled by Knudsen diffusion,and the memebrane exhibited outstanding hydrophilicity since their permeation coefficients of H-2O/N-2 are higher than the Knudsen diffusion values.

• N2 、H2 和CO2 在膜内渗透由Knudsen扩散控制 ；H2 O N2 分离因子均大于Knudsen扩散值 ；表现出良好的亲水性 .