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Dual responsive methacrylic acid and oligo(2-ethyl-2-oxazoline) containing graft copolymers
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Weber, C. (Christine), Becer, C. Remzi, Guenther, Wolfgang, Hoogenboom, Richard and Schubert, Ulrich S. (2010) Dual responsive methacrylic acid and oligo(2-ethyl-2-oxazoline) containing graft copolymers. Macromolecules, Vol.43 (No.1). pp. 160-167. doi:10.1021/ma902014q ISSN 0024-9297 .
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Official URL: http://dx.doi.org/10.1021/ma902014q
Abstract
Graft copolymers containing a poly(methacrylic acid) (PMAA) backbone and oligo(2-ethyl-2-oxazoline) (OEtOx) side chains were synthesized by reversible addition−fragmentation chain transfer (RAFT) polymerization of methacrylic acid (MAA) and OEtOx methacrylate macromonomers. In order to achieve a constant backbone length of the graft copolymer, living OEtOx chains were also directly grafted onto a deprotonated PMAA backbone in grafting densities from 7% to 92%. Both methods resulted in graft copolymers which were characterized by SEC (Mn = 5500 to 18 700 g mol−1, PDI < 1.3), 1H NMR spectroscopy, and acid/base titrations. The solubility behavior of the graft copolymers in aqueous media was investigated using turbidity measurements revealing a lower critical solution temperature (LCST) behavior of the polymers with a grafting density above 35%. The cloud points of the solutions can be varied in a temperature range from 8 to 90 °C by adjustment of the polymer composition and the pH of the solution. 1H NMR measurements in D2O at varying temperatures revealed a collapse of the polymer backbone above the cloud point of the solution whereas parts of the OEtOx side chains remained mobile.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Library of Congress Subject Headings (LCSH): | Graft copolymers, Methacrylic acid, Polymerization | ||||
Journal or Publication Title: | Macromolecules | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 0024-9297 | ||||
Official Date: | 2010 | ||||
Dates: |
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Volume: | Vol.43 | ||||
Number: | No.1 | ||||
Page Range: | pp. 160-167 | ||||
DOI: | 10.1021/ma902014q | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Funder: | Dutch Polymer Institute (DPI), Thuringia (Germany). Ministerium für Bildung, Wissenschaft und Kultur, Fonds der Chemischen Industrie (Germany) | ||||
Grant number: | 612 (DPI) |
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