| 초록 |
Novel carbon-silica/alpha-alumina composite membranes were fabricated by pyrolyzing microphase-separated block or random copolymers (poly(imide siloxane) consisting of two different phases carbon-rich or siloxane-rich phases, and leaving pores with a size and shape determined by the initial morphology of the polymeric precursor.Alpha-alumina tube as a porous support was obtained from NOK CO. (Japan), the average pore size is 0.15 micron, the void fraction is 0.48, and external diameter is 2.1 millimeter. The composite membranes were produced by pyrolysis of a poly(imide siloxane) layer deposited on a alumina tube. The thickness of carbon-silica layer deposited on an alumina tube is 1~3 micron. In the mixed gas separation experiment (oxygen/nitrogen (21%/79%) and carbon dioxide/nitrogen (15%/85%)) performed at room temperature, oxygen permeance was 11.3 GPU when oxygen/nitrogen selectivity was 14.4, and carbon dioxide permeance was 34 GPU when carbon dioxide/nitrogen selectivity was 105.3. The carbon-silica/alumina composite membrane prepared in this study may be expected as a good candidate material for improved gas separation. |
