Novel aromatic diamine monomer containing imidazolium group were synthesized to prepare polyimides and polyamide containing ionic liquid structure in the side chain by the polycondensation of the monomer with acid dianhydride or acid chloride. The glass transition temperatures, Tg, of the obtained polymers were in the range of 60–150 °C, and they exhibited the thermal stability up to 300 °C. The self-standing ultrathin films, so called nanosheets, of these aromatic polymers could be successfully prepared by spin-coating method. Then, the surface coating on the highly gas permeable membrane composed of polydimethylsiloxane graft copolyimide was carried out using the obtained nanosheets, and the effect of surface structure on the gas permeability and selectivity was investigated. As a result, the nanosheet coating on the highly gas permeable membrane with these polyimides containing imidazolium group was effective to improve the selectivity of CO2/N2 and O2/N2.
Polymer – Elsevier
Published: Jan 17, 2018
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