| 초록 |
In this study, microporous polycarbonate membranes were prepared by the phase separation process using supercritical CO2 as a nonsolvent. The blend solution containd 20.8 wt% of polycarbonate and polyethyleneglycol (PEG) in methylene chloride. Using this solution, it was possible to obtain the porous membrane by a phase-inversion method. The sheet casted on the polyethylenenaphthalate(PEN) film was placed in a chamber. By the supercritical CO2 , PEG was removed and microporous polycarbonate membrane was obtained. The produced membrane had strong mechanical properties and identical pore sizes(3∼5㎛). Effects of pressure of CO2(100, 120, and 140 bar), polymer concentration, and temperature(30, 40, and 50 ℃) on the average pore size and membrane porousity were compared.
|
