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The Effect of Hofmeister Salts on the LCST Transition of Poly(2‐oxazoline)s with Varying Hydrophilicity
Author(s) -
Bloksma Meta M.,
Bakker Daniël J.,
Weber Christine,
Hoogenboom Richard,
Schubert Ulrich S.
Publication year - 2010
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200900843
Subject(s) - lower critical solution temperature , oxazoline , cloud point , polymer chemistry , chemistry , polymer , hofmeister series , isopropyl , methacrylate , hydrodynamic radius , copolymer , organic chemistry , salt (chemistry) , aqueous solution , catalysis
The influence of Hofmeister salts was investigated on the cloud point of three poly(2‐oxazoline)s, namely poly(2‐ethyl‐2‐oxazoline) [PEtOx], poly(2‐ n ‐propyl‐2‐oxazoline) [P n PropOx], and poly(2‐isopropyl‐2‐oxazoline) [P i PropOx]. In addition, a comb polymer based on oligo‐2‐ethyl‐2‐oxazoline side chains and a methacrylate backbone (POEtOxMA) was included in this investigation. It was found that the ionic response of the poly(2‐oxazoline)s strongly depends on their hydrophilicity. The comb polymer POEtOxMA revealed a strikingly similar response to the salts as linear PEtOx even though the cloud points of the polymers in water differ. This indicates that the architecture does not significantly influence the effect of the Hofmeister ions, even though there is a difference in the absolute cloud point.