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Polymers 2010, 2(3), 188-199; doi:10.3390/polym2030188

Temperature Induced Solubility Transitions of Various Poly(2-oxazoline)s in Ethanol-Water Solvent Mixtures

1,2,3,*  and 1,4,*
1 Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands 2 Laboratory of Organic and Macromolecular Chemistry, Friedrich-Schiller-University Jena, Humboldtstrasse 10, 07743 Jena, Germany 3 Dutch Polymer Institute, John F. Kennedylaan 2, 5612 AB Eindhoven, The Netherlands 4 Supramolecular Chemistry group, Department of Organic Chemistry, Ghent University, Krijgslaan 281 S4, 9000 Ghent, Belgium
* Authors to whom correspondence should be addressed.
Received: 13 June 2010 / Revised: 3 August 2010 / Accepted: 6 August 2010 / Published: 10 August 2010
(This article belongs to the Special Issue Novel Stimuli-Responsive (co)Polymers)
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The solution behavior of a series of poly(2-oxazoline)s with different side chains, namely methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, pentyl, hexyl, heptyl, octyl, nonyl, phenyl and benzyl, are reported in ethanol-water solvent mixtures based on turbidimetry investigations. The LCST transitions of poly(2-oxazoline)s with propyl side chains and the UCST transitions of the poly(2-oxazoline)s with more hydrophobic side chains are discussed in relation to the ethanol-water solvent composition and structure. The poly(2-alkyl-2-oxazoline)s with side chains longer than propyl only dissolved during the first heating run, which is discussed and correlated to the melting transition of the polymers.
Keywords: poly(2-oxazoline); solubility transitions; ethanol-water; LCST; UCST; thermoresponsiveness poly(2-oxazoline); solubility transitions; ethanol-water; LCST; UCST; thermoresponsiveness
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Lambermont-Thijs, H.M.L.; Kuringen, H.P.C.; Put, J.P.W.; Schubert, U.S.; Hoogenboom, R. Temperature Induced Solubility Transitions of Various Poly(2-oxazoline)s in Ethanol-Water Solvent Mixtures. Polymers 2010, 2, 188-199.

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