ポリピロロン– シリカハイブリッド膜の気体輸送特性

抄録

Gas transport properties of novel polypyrrolone (PPL)–silica hybrid membranes were investigated. The PPL–silica hybrid membranes were prepared by applying thermal rearrangement of poly(ortho–amino imide) as a precursor polymer and sol–gel reaction using tetraethoxysilane. Gas permeability of neat PPL membranes improved with the increase in rearranged temperature, suggesting the increased free volume. H₂/CH₄ and CO₂/CH₄ selectivities of the PPL–silica hybrid membranes increased as the silica content increased, tending to cross the corresponding upper bounds. The notable H₂/CH₄ and CO₂/CH₄ separation behaviors would be brought by the simultaneous effect of high fractional free volume derived from the conversion towards PPL and size–suppressed free volume holes formed at the polymer–silica interfaces.