Kim, JH Min, BR Park, HC Won, J Kang, YS 2024-01-21T11:43:40Z 2024-01-21T11:43:40Z 2021-09-05 2001-09-29 0021-8995 https://pubs.kist.re.kr/handle/201004/140171 The solubility gaps for poly(vinyl pyrrolidone) (PVP) in four polyimide solutions (NMP, DMF, GEL, DMSO) were determined by cloud point measurement and correlated with chi (PI/Solvent) and Delta delta (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 GEL 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. (C) 2001 John Wiley & Sons, Inc. English JOHN WILEY & SONS INC MEMBRANE FORMATION IMMERSION PRECIPITATION MECHANISM SOLVENT MICROSTRUCTURES THERMODYNAMICS SEPARATION MACROVOIDS ADDITIVES ACETATE Phase behavior and morphological studies of polyimide/PVP/solvent/water systems by phase inversion Article 10.1002/app.1804 1 JOURNAL OF APPLIED POLYMER SCIENCE, v.81, no.14, pp.3481 - 3488 JOURNAL OF APPLIED POLYMER SCIENCE 81 14 3481 3488 scie scopus 000169984700014 2-s2.0-0035968645 Polymer Science Polymer Science Article MEMBRANE FORMATION IMMERSION PRECIPITATION MECHANISM SOLVENT MICROSTRUCTURES THERMODYNAMICS SEPARATION MACROVOIDS ADDITIVES ACETATE polyimide (PI) PVP phase inversion macrovoid phase separation