| 초록 |
Imidazole compounds have attracted enormous attentions due to its potential to generate clusters, ionic liquids, bio-macromolecules and etc. In particular, 1-vinylimidazole is polymerizable monomer via radical polymerization and can be polymerized into copolymer with other monomers. In this work, we synthesized poly(vinyl imidazole)-poly(oxyethylene methacrylate) (PVIm-POEM) via radical polymerization and coated on porous polysulfone (PSf) substrate to prepare composite membrane. The imidazole group in glassy PVIm (Tg ~ 171 ºC) serves as the facilitated transport pathway with good diffusivity and repetitive ethylene glycol group in rubber POEM (Tg ~ -50 ºC) plays an important role to enhance the solubility of CO2. Moreover, more content of POEM in PVIm-POEM resulted in higher selectivity and permeability of composite membrane whereas polymerized POEM (polyPOEM) showed severe defects and Knudsen diffusion due to its too rubbery phase. The PVIm-POEM with 3 to 7 ratio exhibited the best CO2 permeability of 148.6 Barrer and CO2/N2 and CO2/CH4 selectivity of 65.3 and 35.0, respectively. |
