Gas separation properties of hybrid imide–siloxane copolymers with various silica contents

摘要: Abstract Hybrid polyimide–siloxane copolymers containing different proportion of silica have been prepared by polycondensation, imidisation and sol–gel coreaction pyromellitic dianhydride, aminoalkoxysilane tetramethoxysilane. Two types (aminopropyltrimethoxysilane aminopropylmethyldiethoxysilane) able to provide a bonding between the inorganic organic phase were used. Materials obtained characterized various techniques (thermogravimetric analysis, infrared spectrometry 29 Si NMR) in order study their molecular structure. The presence methyl side-groups linked silicon APrMDEOS precursors inhibit formation OH free or bonds material. Gas permeation measurements at temperatures for hydrogen, carbon dioxide nitrogen. permeability properties two materials vary with siloxane content nature aminosiloxane. Thus, network crosslinking are limiting factor gas permeation. transport is thermally activated activation energy values materials.