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유종범,김성수 慶熙大學校 材料科學技術硏究所 1998 材料科學技術硏究論集 Vol.11 No.-
Hollow fiber membranes with chemical and thermal resistances were preapared via themally-induced phase separation process followed by stretching process from the semicrystalline polymers. Isotactic polypropylene was selected as a membrane material and soybeam oil was as a diluent. Various operating parameters were examined in terms of their effects on the structure variation of the membrane, and were optimized. Melt viscosity of polymer-diluent solution influenced stretching of the membrane to affect the porosity and pore size of membrane. Lower coagulation bath temperature accelerated the formation of spherulite, and more stretching was performed. Draw ratio directly affected the stretching of the membrane and membrane prepared at higher draw ratio showed the higher flux and bigger pore size.