This study was undertaken to establish the preparation condition of the flat sheet polysulfone and poly(ether sulfone)membranes for ultrafiltration application. Several membrane preparation parameters were introduced to the membrane preparation process, and their effects on the morphology and performance of resulting membrane were investigated. Detailed studies on the permeation characteristics and morphology of polysulfone membranes were undertaken through the various mixed solvent system composed of N-methyl-2-pyrrolidone and more volatile cosolvent such as tetrahydrofuran, chloroform, and dichloromethane. It is found that the pure water flux gradually decreased with increasing the co-solvent portion in the mixed solvent system, while the solute rejection increased. Considering the pure water flux and solute rejection of the resulting membranes, the NMP-DCM mixed solvent system was proved to be more preferable. The molecular weight cut-off of the polysulfone and poly(ether sulfone)membranes developed in this study is more than 20,000.

습식 상전환법에 의한 한외여과용 폴리술폰막과 폴리에테르술폰막의 제조에 필요한 기초적인 지식과 막 설계지침을 확립하고자, 막 제조시, 각종의 제막 변수들을 도입하여 제막 변수들이 막의 구조 및 투과 특성에 미치는 영향을 조사 검토하였다. 혼합 용매계에서 휘발성이 강한 조용매의 함량비가 증가함에 따라, 수투과량은 점차 감소하였고, 용질배제율은 각각 조용매의 성질에 따라 다양하게 증가하는 것으로 나타났다. 투과유속과 용질배제율을 고려하였을 때, NMP-DCM 혼합 용매계가 가장 적절한 것으로 추측되었다. 폴리술폰막과 폴리에테르술폰막은 20,000 이상의 평균분자량 분획 특성을 보였다.

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