The final structure of porous membrane is decided by the diffusion speed of supercritical CO2 fluid inside the polymer and the plasticizing effect of polymer caused by supercritical CO2 fluid.

• 论述了CO2对聚合物增塑作用的大小和CO2在聚合物材料中向外扩散的速率是最终影响膜孔结构形态的两个基本因素；