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Formation of polyurethane membranes by immersion precipitation. i. liquid–liquid phase separation in a polyurethane/DMF/water system
Author(s) -
Duk Young,
Young Je,
Kwang Hwan,
Chul Sung
Publication year - 1999
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/(sici)1097-4628(19990919)73:12<2377::aid-app7>3.0.co;2-f
Subject(s) - polyurethane , binodal , materials science , spinodal , spinodal decomposition , phase (matter) , polymer chemistry , chemical engineering , ternary operation , ternary numeral system , cloud point , polycarbonate , membrane , thermodynamics , chemistry , aqueous solution , composite material , phase diagram , organic chemistry , biochemistry , physics , computer science , engineering , programming language
Liquid–liquid phase separation phenomena of polyurethane/DMF/water were studied. Two polyurethanes having different hydrophobicity were synthesized by varying the polyol components. The cloud‐point curves for the ternary system of polyurethane/DMF/water were determined by the titration method. A small amount of water is needed to induce liquid–liquid demixing, and the region of the homogeneous phase is enlarged with increased hydrophilicity of the polyurethane. We measured the interaction parameters, and calculated the binodal and spinodal curves based on the thermodynamics of polymer solutions. The light transmission experiment showed that precipitation time increased with the higher content of DMF in a coagulation bath. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 2377–2384, 1999