Gas Separation Properties of Polyimide Thin Films on Ceramic Supports for High Temperature Applications

摘要: Novel selective ceramic-supported thin polyimide films produced in a single dip coating step are proposed for membrane applications at elevated temperatures. Layers of the polyimides P84®, Matrimid 5218®, and 6FDA-6FpDA were successfully deposited onto porous alumina supports. In order to tackle poor compatibility between ceramic support polymer, get defect-free films, effect viscosity polymer solution was studied, giving entanglement concentration (C*) each polymer. The C* values 3.09 wt. % 6FDA-6FpDA, 3.52 Matrimid®, 4.30 P84®. A minimum necessary film formation found with inverse intrinsic viscosities (P84® ≥ Matrimid® >> 6FDA-6FpDA). temperature on permeance prepared membranes studied H2, CH4, N2, O2, CO2. As expected, activation energy hydrogen higher than CO2, resulting H2/CO2 selectivity increase temperature. More densely packed polymers lead materials that more