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Phase behavior and morphological studies of polyimide/PVP/solvent/water systems by phase inversion
Author(s) -
Kim Jong Hak,
Min Byoung Ryul,
Park Hyun Chae,
Won Jongok,
Kang Yong Soo
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1804
Subject(s) - miscibility , phase inversion , polyimide , solvent , solubility , polymer chemistry , membrane , cloud point , polymer , materials science , hildebrand solubility parameter , chemical engineering , porosity , phase (matter) , morphology (biology) , chemistry , aqueous solution , composite material , organic chemistry , biochemistry , layer (electronics) , biology , engineering , genetics
The solubility gaps for poly(vinyl pyrrolidone) (PVP) in four polyimide solutions (NMP, DMF, GBL, DMSO) were determined by cloud point measurement and correlated with χ PI/Solvent and Δδ PVP/Solvent . Membranes prepared with NMP and DMF systems showed a tendency of suppressing fingerlike structure with addition of PVP. On the other hand, membranes prepared with GBL and DMSO systems showed an inclination toward inducing macrovoid formation. These effects of PVP on the membrane morphology were explained by means of miscibility gap, viscosity of the polymer solution, polymer–polymer phase separation, and overall porosity. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 3481–3488, 2001