COMPOSITE GAS-SEPARATING MEMBRANES WITH POLYMERIZED LB FILMS

Composite gas-separating membranes were prepared by deposition of mult ibilayer diacetylene Langmuir-Blodgett (LB) films onto a poly( dimethy lsiloxane) membrane. Local measurements of gas permeability with the s urface resolution of 0.2 cm(2) show that LB modification increases bot h membrane permeability to O-2 and He gases and dispersion of local pe rmeability over the membrane surface. A poly(diacetylene) LB film incr eases the selectivity of O-2/N-2 and He/N-2 separation by 1.5 and 1.2 times, respectively. The potential of LB films in the improvement of g as separation is discussed.