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Structural Changes of PVDF Membranes by Phase Separation Control
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 Title & Authors
Structural Changes of PVDF Membranes by Phase Separation Control
Lee, Semin; Kim, Sung Soo;
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Thermally induced phase separation (TIPS) and nonsolvent induced phase separation (NIPS) were simultaneously induced for the preparation of flat PVDF membranes. N-methyl-2-pyrrolidone (NMP) was used as a solvent and dibutyl-phthlate (DBP) was used as a diluent for PVDF. When PVDF was melt blended with NMP and DBP, crystallization temperature was lowered for TIPS and unstable region was expanded for NIPS. Ratio of solvent to diluent changed the phase separation mechanism to obtain the various membrane structures. Contact mode of dope solution with nonsolvent determined the dominant phase separation behavior. Since heat transfer rate was greater than mass transfer rate, surface structure was formed by NIPS and inner structure was by TIPS. Quenching temperature of dope solution also affected the phase separation mechanism and phase separation rate to result in the variation of structure.
PVDF Membranes;Membrane Preparation;Thermally Induced Phase Separation (TIPS);Nonsolvent-Induced Phase Separation (NIPS);Crystallization;Unstable Region;
 Cited by
열유도상분리법 적용을 위한 PVDF-DBP 소재의 특성평가,김세종;이정우;남상용;

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