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Effect of some selective aromatic cosolutes on the main thermodynamic parameters of aqueous poly( n ‐vinyl‐2‐pyrrolidone) solutions
Author(s) -
Kavlak Serap,
Güner Ali
Publication year - 2000
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 - 10.1002/1097-4628(20001017)78:3<507::aid-app40>3.0.co;2-8
Subject(s) - aniline , benzoic acid , aqueous solution , chemistry , solvent , polymer chemistry , polymer , cloud point , organic chemistry
Cloud‐point curves and theta temperatures have been determined for aqueous solutions of poly( N ‐vinyl‐2‐pyrrolidone) at several concentrations for a variety of aromatic additives (benzoic acid, o ‐ and p ‐hydroxy benzoic acid, aniline, o ‐ and p ‐hydroxy aniline). The theta temperature of polymer is suppressed at lower temperatures depending on the chemical structure and the concentration of additives. The effectiveness, in decreasing order, of the cosolutes in reducing the temperature is: p ‐hydroxy benzoic acid > o ‐hydroxy benzoic acid > p ‐hydroxy aniline > o ‐hydroxy aniline ≈ benzoic acid > aniline. It is understood that changes in theta temperatures caused by the cosolute result from the changes taking place in the hydrophilic and hydrophobic interactions among polymer, solvent and polymer–solvent interactions from the added cosolute. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 507–510, 2000