Thermoresponsive Poly(2-oxazoline) Molecular Brushes by Living Ionic Polymerization: Kinetic Investigations of Pendant Chain Grafting and Cloud Point Modulation by Backbone and Side Chain Length Variation

Handle URI:
http://hdl.handle.net/10754/600004
Title:
Thermoresponsive Poly(2-oxazoline) Molecular Brushes by Living Ionic Polymerization: Kinetic Investigations of Pendant Chain Grafting and Cloud Point Modulation by Backbone and Side Chain Length Variation
Authors:
Zhang, Ning; Luxenhofer, Robert; Jordan, Rainer
Abstract:
Molecular brushes of poly(2-oxazoline)s were prepared by living anionic polymerization of 2-iso-propenyl-2-oxazoline to form the backbone and subsequent living cationic ring-opening polymerization of 2-n- or 2-iso-propyl-2-oxazoline for pendant chain grafting. In situ kinetic studies indicate that the initiation efficiency and polymerization rates are independent from the number of initiator functions per initiator molecule. This was attributed to the high efficiency of oxazolinium salt and the stretched conformation of the backbone, which is caused by the electrostatic repulsion of the oxazolinium moieties along the macroinitiator. The resulting molecular brushes showed thermoresponsive properties, that is, having a defined cloud point (CP). The dependence of the CP as a function of backbone and side chain length as well as concentration was studied. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Citation:
Zhang N, Luxenhofer R, Jordan R (2012) Thermoresponsive Poly(2-oxazoline) Molecular Brushes by Living Ionic Polymerization: Kinetic Investigations of Pendant Chain Grafting and Cloud Point Modulation by Backbone and Side Chain Length Variation. Macromolecular Chemistry and Physics 213: 973–981. Available: http://dx.doi.org/10.1002/macp.201200015.
Publisher:
Wiley-Blackwell
Journal:
Macromolecular Chemistry and Physics
Issue Date:
17-Apr-2012
DOI:
10.1002/macp.201200015
Type:
Article
ISSN:
1022-1352
Sponsors:
This work was supported by the Elitenetzwerk Bayern in the frame of the international graduate school CompInt ("Materials Science of Complex Interfaces") as part of the IGSSE ("International Graduate School for Science and Engineering") at the Technische Universitat Munchen. R.J. thanks for additional support by the Cluster of excellence "Center for Regenerative Therapies Dresden" (CRTD). R. L. was supported by a postdoctoral stipend from the King Abdullah University of Science and Technology (KAUST).
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Full metadata record

DC FieldValue Language
dc.contributor.authorZhang, Ningen
dc.contributor.authorLuxenhofer, Roberten
dc.contributor.authorJordan, Raineren
dc.date.accessioned2016-02-28T06:34:11Zen
dc.date.available2016-02-28T06:34:11Zen
dc.date.issued2012-04-17en
dc.identifier.citationZhang N, Luxenhofer R, Jordan R (2012) Thermoresponsive Poly(2-oxazoline) Molecular Brushes by Living Ionic Polymerization: Kinetic Investigations of Pendant Chain Grafting and Cloud Point Modulation by Backbone and Side Chain Length Variation. Macromolecular Chemistry and Physics 213: 973–981. Available: http://dx.doi.org/10.1002/macp.201200015.en
dc.identifier.issn1022-1352en
dc.identifier.doi10.1002/macp.201200015en
dc.identifier.urihttp://hdl.handle.net/10754/600004en
dc.description.abstractMolecular brushes of poly(2-oxazoline)s were prepared by living anionic polymerization of 2-iso-propenyl-2-oxazoline to form the backbone and subsequent living cationic ring-opening polymerization of 2-n- or 2-iso-propyl-2-oxazoline for pendant chain grafting. In situ kinetic studies indicate that the initiation efficiency and polymerization rates are independent from the number of initiator functions per initiator molecule. This was attributed to the high efficiency of oxazolinium salt and the stretched conformation of the backbone, which is caused by the electrostatic repulsion of the oxazolinium moieties along the macroinitiator. The resulting molecular brushes showed thermoresponsive properties, that is, having a defined cloud point (CP). The dependence of the CP as a function of backbone and side chain length as well as concentration was studied. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.en
dc.description.sponsorshipThis work was supported by the Elitenetzwerk Bayern in the frame of the international graduate school CompInt ("Materials Science of Complex Interfaces") as part of the IGSSE ("International Graduate School for Science and Engineering") at the Technische Universitat Munchen. R.J. thanks for additional support by the Cluster of excellence "Center for Regenerative Therapies Dresden" (CRTD). R. L. was supported by a postdoctoral stipend from the King Abdullah University of Science and Technology (KAUST).en
dc.publisherWiley-Blackwellen
dc.subjectgrafting kineticsen
dc.subjectLCSTen
dc.subjectmolecular brushen
dc.subjectoxazolinium salten
dc.subjectpolyoxazolineen
dc.subjectside chainsen
dc.titleThermoresponsive Poly(2-oxazoline) Molecular Brushes by Living Ionic Polymerization: Kinetic Investigations of Pendant Chain Grafting and Cloud Point Modulation by Backbone and Side Chain Length Variationen
dc.typeArticleen
dc.identifier.journalMacromolecular Chemistry and Physicsen
dc.contributor.institutionTechnische Universitat Munchen, Munich, Germanyen
dc.contributor.institutionTechnische Universitat Dresden, Dresden, Germanyen
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