| 초록 |
Polyamide (PA) composite membranes were prepared by interfacial polymerization(IP) with m-phenylene diamine(MPD) and trimesoyl chloride(TMC) as monomers. Two kinds of IP processes were attempted; on the solid poly(vinylidene fluoride)(PVDF) support and on the phase separating dope solution of PVDF/1-methyl-2-pyrrolidone(NMP). Water/ethanol mixtures were used as solvents for MPD as well as the coagulants of dope solution. In-situ IP was performed while PVDF/NMP dope solution underwent the phase separation. Since solid PVDF is hydrophobic, additional hydrophilization was required. However, if coagulant containing MPD was used to induce the phase separation, MPD can be penetrated into PVDF support membrane. Depending on the miscibility of coagulant and n-hexane the samples underwent the different phase separation mechanisms. Various structures of support layers and active layers were formed depending on the monomer concentrations, MPD-TMC contact time and curing conditions. |
