According to mechanism of pore formation

micro-and ultramicro-cellular polytetraflouroethylene porous membrances were prepared with classical dispersion.gelation and pressure-induced phase separation method

and characterized by scanning electron microscope.electron spectroscopy for chemical analysis.differential scanning calorimeter and bubling method. The results show that the membranes through pressure-induced phase separation and plasma polymerization with ethylene are easy to control and have good characteristics.