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Interaction of poly(N‐isopropylacrylamide) with perfluorooctanoic acid in aqueous solution
Author(s) -
Schild Howard G.,
Tirrell David A.
Publication year - 1992
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19920640116
Subject(s) - perfluorooctanoic acid , lower critical solution temperature , poly(n isopropylacrylamide) , aqueous solution , chemistry , isothermal microcalorimetry , cloud point , surface tension , enthalpy , chromatography , polymer , biochemistry , organic chemistry , thermodynamics , physics , copolymer
Interaction of poly(N‐isopropylacrylamide) (PNIPAAM) with perfluorooctanoic acid (PFOA) was explored in aqueous solution. Increasing concentrations of PFOA were observed first to depress slightly the lower critical solution temperature (LCST) then to elevate it at concentrations greater than ca. 2.5 mM. At concentrations >ca. 3.5 mM, the LCST transition could not be detected by either microcalorimetry or cloud point measurements. PNIPAAM appeared to promote the micellization of PFOA. Pinacyanol dye experiments were ambiguous, but the aggregation concentration reported by surface tension measurements was clearly depressed upon addition of PNIPAAM.