| 摘要 |
PURPOSE:To obtain the subject hollow fiber membrane having excellent heat-resistance by mixing an acrylonitrile(AN) polymer, a thermally decomposable polymer and a solvent, spinning and drawing the mixture and subjecting the obtained AN hollow fiber to flame-resistant treatment and carbonization treatment to make a porous membrane. CONSTITUTION:An AN hollow fiber is produced by mixing (A) an AN polymer containing 90-100mol% of AN unit with (B) a thermally decomposable polymer decomposed at <=600 deg.C to form a low-molecular weight compound (preferably polystyrene, etc.) and (C) a solvent (preferably DMF, etc.) and spinning and drawing the mixture. The obtained hollow fiber is subjected to flame-resistant treatment and then carbonized at >=400 deg.C to make a porous membrane. The objective hollow fiber membrane produced by the above process contains small pores continuously connected from the inner wall surface to the outer wall surface of the hollow fiber membrane, has a peak of the pore radius at 10-1,000nm (determined by a differential curve of pore volume) and a total pore volume of 0.1-1cm<3>/g, is bendable with a radius of curvature of <=10cm and exhibits a decomposition temperature of >=300 deg.C corresponding to the temperature to decompose 10wt.% of the hollow fiber membrane measured by TGA. |
