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Dimethyl acetamide sorption equilibria in a urethane/urea/ether block copolymer
Author(s) -
Gou M. M.,
Koros W. J.,
Goldman G. W.
Publication year - 1991
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.1991.070431105
Subject(s) - sorption , copolymer , desorption , acetamide , polymer , solvent , enthalpy , ether , dimethylacetamide , materials science , urea , chemical engineering , chemistry , polymer chemistry , thermodynamics , organic chemistry , adsorption , physics , engineering
A study of the interaction of solvent in a urethane/urea/ether copolymer belonging to the spandex family of materials is presented. Sorption and desorption isotherm data for N , N ‐dimethylacetamide (DMAc) in spandex solutions are used to determine thermodynamic parameters of solvent/polymer interaction. Isosteric enthalpies for sorption of DMAc tend to approach the heat of evaporation of DMAc at high sorbed concentrations. A qualitative mechanism for assemblage of hard‐segment domains in the polymer during desorption is presented and interpreted in terms of the sorption isotherms and isosteric enthalpy data. The study provides useful insights into the influence of particulate additives, such as titanium dioxide (TiO 2 ) in the solution.