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http://dx.doi.org/10.14579/MEMBRANE_JOURNAL.2014.24.2.158

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

Park, Minsoo (Kyung Hee University)
Kim, Jinho (Econity Co., Ltd.)
Jang, Moonseog (Econity Co., Ltd.)
Kim, Sung Soo (Kyung Hee University)
Publication Information
Membrane Journal / v.24, no.2, 2014 , pp. 158-166 More about this Journal
Abstract
In this research, microporous and bicontinuous poly vinylidene fluoride(PVDF) hollow fiber membranes were prepared via hybrid process of the thermally induced phase separation (TIPS) and stretching method. The mechanism of the membrane preparation is based on liquid-liquid phase separation. The final membranes have characteristic structures which have both bicontinuous and fibrillar morphology by applying the stretching method. They showed quite different structure when 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 hollow fiber 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 temperature and diluents were extracted by ethanol. Effects of the stretching ratio on the membrane morphology were investigated using scanning electron microscope (SEM), and its effects on water flux, porosity, pore size, roughness and tensile strength were examined.
Keywords
PVDF; hollow fiber membrane; TIPS; stretching; L-L TIPS; S-L TIPS;
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