| 초록 |
Conventionally, there are three major categories for manufacturing microfiltration membranes with organic polymers. First there is the phase inversion method of which pore size and porosity are mainly controlled by the interaction of three components: polymer, solvent and nonsolvent. Second is the thermally induced phase separation method. In this method, only two phases of polymer and diluent are involved in making pores via liquid-liquid or solid-liquid phase separation. The last is the stretching method which was employed in this work. The stretching method is the simplest method of three, which do not require any other material except the polymer. Because this process does not require any solvents, diluents and additives, it is a very clean and economical process. Also, the membranes prepared by this method have very high mechanical strength. In this study, we prepared the porous hollow fiber membranes by stretching method with PVDF(polyvinylidene fluoride) material which has very high resistance to the chlorine used as a cleaning agent in water and waste water treatment. FE-SEM, AFM, FT-IR and Wide-angle x-ray diffraction (WAXD) were used in analyzing the characteristics of materials and membranes. |
