한국막학회:학술대회논문집 (Proceedings of the Membrane Society of Korea Conference)
- 한국막학회 1995년도 추계 총회 및 학술발표회
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- Pages.45-46
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- 1995
The Phase Separation Phenomena of PSf/NMP Solutions in Varying Relative Humidities
초록
Generally, two different techniques have been employed for the precipitation of membranes from a polymer casting solution. In the first method, a precipitant is introduced from a vapor phase. In this case the precipitaion rate is very slow and a more or less symmetric structure is formed. In the second method, a precipitant is added to a casting solution by immersing the cast polymer film in a nonsolvent bath. In this case the precipitation rate is very fast and a skinned asymmetric membrane structure is obtained. In this study, we introduced water-vapor to PSf/NMP solution and took photographs of phase separation phenomena of polymer lean phase.
키워드