| 초록 |
The hollow fiber membranes were prepared via hybrid process of the thermally induced phase separation(TIPS) and the non-solvent induced phase separation(NIPS). Hybrid process can be operated in the low temperature and induce various membrane structures by temperature control as well as solvent/nonsolvent exchange. The spinning dope solution consisted of poly(vinylidene fluoride) (PVDF) / dibutyl phthalate (DBP) / 1-methyl-2-pyrrolidone (NMP), where DBP was used as a diluent and NMP as a solvent for PVDF. Various bore fluids were tested such as nitrogen, water, NMP aqueous solution and DBP, and their effects on TIPS and NIPS were examined. The resultant morphology obtained by scanning electron microscopy (SEM) were interpreted in terms of phase separation mechanisms. Membrane characterizations were performed such as water flux, porosity, pore size, and mechanical strength. |
