PROPERTIES OF NEW INORGANIC MEMBRANES PREPARED BY METAL ALKOXIDE METHODS .2. NEW INORGANIC-ORGANIC ANION-EXCHANGE MEMBRANES PREPARED BY THEMODIFIED METAL ALKOXIDE METHODS WITH SILANE COUPLING AGENTS

Four types of inorganic-organic anion exchangeable membranes were prep ared on a microporous alumina substrate by dip-coating with solution c ontaining Si(OC2H5)(4), C2H5OH, H2O, CH3COOH, two silane coupling agen ts in molar ratio 1:6.8:2:0.03:0.02, and on a silica membrane by liqui d-phase coupling method with two solutions containing C6H5CH3, H2O, 2- (trimethoxysilyl)ethyl-2-pyridine in molar ratio 11:0.06:0.04 or C2H5O H, H2O, N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride in mo lar ratio 21:0.06:0.06. The alumina substrate and silica membrane show ed cation exchangeability, but membranes dip-coated and liquid-phase c oupled showed anion exchangeability and their ion-exchange capacity pe r unit area of membrane surface were in the range 4-9 x 10(-3) meq. cm (-2). The static transport number for liquid-phase coupled membranes w as in the range of 0.6-0.9, but for dip-coated membranes it was 0.5.