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ISSN : 1226-0088(Print)
ISSN : 2288-7253(Online)
Membrane Journal Vol.24 No.2 pp.158-166

열유도 상분리와 연신공정을 이용한 PVDF 중공사막의 제조

박 민 수*, 김 진 호**, 장 문 석**, 김 성 수*,†
*경희대학교 공과대학 화학공학과, **(주)에코니티

Preparation of PVDF Hollow Fiber Membrane via TIPS (Thermally Induced Phase Separation) and Stretching

Sung Soo Kim*,†, Minsoo Park*, Jinho Kim**, Moonseog Jang**
*Kyung Hee University, Yongin, Gyeonggi 446-701, Korea
**Econity Co.,Ltd., Yongin, Gyeonggi 449-825, Korea
(Received April 15, 2014, Revised April 24, 2014, Accepted April 24, 2014)


In this research, microporous and bicontinuous poly vinylidene fluoride(PVDF) hollow fiber membranes wereprepared via hybrid process of the thermally induced phase separation (TIPS) and stretching method. The mechanism of themembrane preparation is based on liquid-liquid phase separation. The final membranes have characteristic structures whichhave both bicontinuous and fibrillar morphology by applying the stretching method. They showed quite different structurewhen compared with the spherulitic or nodular structure from S/L TIPS and bicontinuous structure from L/L TIPS. At first,PVDF hollow fiber precursors were prepared via TIPS method using various kind of diluent mixtures. We used gamma-butyrolacton,dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP) as diluents. We could make hollowfiber membranes which had porous outer surface or dense outer surface by controling the parameters such as cooling conditions,PVDF concentration and the ratio of diluent mixtures. Finally, these hollow fiber were stretched at room temperatureand diluents were extracted by ethanol. Effects of the stretching ratio on the membrane morphology were investigated usingscanning electron microscope (SEM), and its effects on water flux, porosity, pore size, roughness and tensile strength wereexamined.