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미세다공성 비대칭형 폴리술폰 중공사막의 활성표면층 생성 조절

Active Skin Layer Formation Control of Microporous Asymmetric Polysulfone Hollow Fiber Memberanes

HWAHAK KONGHAK, August 1989, 27(4), 595-601(7), NONE
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Abstract

폴리술폰 중공사막의 다양한 응용을 위해 표면층(skin layer)의 위치를 조절할 수 있도록 방사조건을 변화시켜 보았다. 폴리술폰 18wt%와 폴리비닐피롤리돈(PVP)이나 2-메톡시에탄올(MC)을 15wt%, N,N-디메틸아세트아마이드(DMA)fmf 67wt%로 혼합하여 만든 제막용액을 건습식 방사로 중공사막을 제조하였는 데 내부응고제로 물을 썼을 때는 주로 내부표면층 중공사막이 형성되었으며 글리세린이나 98wt% 이소프로판올+2wt% 물과 같이 응고력이 약한 것을 내부응고제로 쓰면 이중표면층 중공사막이 형성되었다. 응고력이 거의 없거나 아주 약한 공기나 이소프로판올, 95wt% DMA+5wt% 물 등을 내부 응고제로 쓰면 외부표면층 중고사막이 형성되었는데 95wt% DMA+5wt% 물을 내부응고제로 하여 제조된 중공사막은 PEG M.W.20,000(2,000ppm)수용액에 대해 95%의 배제율을 보였으며 이 때 한외여과속도는 5.3×10-3cm/atmㆍmin로 나타났다.
Hollow fiber membranes were spun from the mixture of 18wt% polysulfone, 67wt% solvent N,N-dimethylacetamide(DMA)and 15wt% additive(polyvinylpyrrolidone or 2-methoxyethanol) with a take-up winder under the condition of 50% relative humidity, 60cm air gap, 10m/min spinning speed and external coagulant water. Bore coagulant such as water made inner skinned membranes and weak coagulant such as glycerine or 98wt% DMA+5wt% water made outer skinned membranes. The hollow fiber membrane spun with 95wt% DMA+5wt% water solution as bore coagulant showed the rejection as high as 95% against PEG M.W.20,000 (2,000ppm)solution and then its ultrafiltration flux was as great as 5.3×10-3cm/atmㆍmin.

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