| 초록 |
Designing a highly CO2-philic copolymer is fascinating approach based on Lewis acid-base interaction to achieve high CO2/N2 selectivity. In particular, poly(oxyethylene methacrylate) (POEM) is a polymerizable macromonomer and can be polymerized into copolymer with other monomers. First, 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 resultant PVIm-POEM copolymer is easily dissolved in benign solvents such as ethanol, water, methanol and etc. The glassy PVIm (Tg ~ 171 ºC) enhances the physical property of copolymer while repetitive PEG group in rubbery POEM (Tg ~ -50 ºC) plays an important role to enhance the solubility of CO2. The PVIm-POEM exhibited the best CO2 permeability of 148.6 Barrer and CO2/N2 selectivity of 65.3. Second, an in-situ approach was introduced to construct the asymmetric mixed matrix membranes (MMMs). The successful incorporation of ZIF-8 filler in the PVIm-POEM copolymer matrix resulted in an ultrathin composite membrane to achieve the CO2 permeance of 4474 GPU maintaining CO2/N2 selectivity of 32.0. |
