| 초록 |
The room-temperature, one-pot process for CO2 separation membranes based on a graft copolymer consisting of poly(ethylene-alt-maleic anhydride) (PEMA) main chains and poly(propylene glycol) (PPG) side chains is reported. The PEMA–g-PPG graft copolymer was synthesized by a reaction between O-(2-aminopropyl)-O’-(2-methoxyethyl) polypropyl ene glycol (AMPPG) and PEMA in butanol without the use of any additives and heating. The complete reaction (100% conversion) was confirmed by FT-IR and NMR spectroscopy. More importantly, the as-synthesized PEMA-g-PPG solution was directly coated onto a microporous polysulfone support to fabricate thin-film composite membranes without any post-treatment such as purification, precipitation, and redissolving. XRD and DSC analysis revealed that the PEMA-g-PPG graft copolymer exists in an amorphous rubbery state with a bimodal microstructure consisting of a rigid hydrophobic PEMA backbone and soft hydrophilic PPG side chains. The PEMA-g-PPG membrane exhibited high selectivity (i.e. 82.6 for CO2/N2 and 26.8 for CO2/CH4) and good CO2 permeability (99.1 Barrer) that were close to the upper boundary limit (2008). |
