Thermoresponsive Poly(2-Oxazoline) Molecular Brushes by Living Ionic Polymerization: Modulation of the Cloud Point by Random and Block Copolymer Pendant Chains

Handle URI:
http://hdl.handle.net/10754/600005
Title:
Thermoresponsive Poly(2-Oxazoline) Molecular Brushes by Living Ionic Polymerization: Modulation of the Cloud Point by Random and Block Copolymer Pendant Chains
Authors:
Zhang, Ning; Luxenhofer, Robert; Jordan, Rainer
Abstract:
Molecular brushes (MBs) of poly(2-oxazoline)s were prepared by living anionic polymerization of 2-isopropenyl-2-oxazoline to form the backbone and living cationic ring-opening polymerization of 2-n-propyl-2-oxazoline and 2-methyl-2-oxazoline to form random and block copolymers. Their aqueous solutions displayed a distinct thermoresponsive behavior as a function of the side-chain composition and sequence. The cloud point (CP) of MBs with random copolymer side chains is a linear function of the hydrophilic monomer content and can be modulated in a wide range. For MBs with block copolymer side chains, it was found that the block sequence had a strong and surprising effect on the CP. While MBs with a distal hydrophobic block had a CP at 70 °C, MBs with hydrophilic outer blocks already precipitated at 32 °C. Copyright © 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: Modulation of the Cloud Point by Random and Block Copolymer Pendant Chains. Macromolecular Chemistry and Physics 213: 1963–1969. Available: http://dx.doi.org/10.1002/macp.201200261.
Publisher:
Wiley-Blackwell
Journal:
Macromolecular Chemistry and Physics
Issue Date:
10-Aug-2012
DOI:
10.1002/macp.201200261
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.accessioned2016-02-28T06:34:12Zen
dc.date.available2016-02-28T06:34:12Zen
dc.date.issued2012-08-10en
dc.identifier.citationZhang N, Luxenhofer R, Jordan R (2012) Thermoresponsive Poly(2-Oxazoline) Molecular Brushes by Living Ionic Polymerization: Modulation of the Cloud Point by Random and Block Copolymer Pendant Chains. Macromolecular Chemistry and Physics 213: 1963–1969. Available: http://dx.doi.org/10.1002/macp.201200261.en
dc.identifier.issn1022-1352en
dc.identifier.doi10.1002/macp.201200261en
dc.identifier.urihttp://hdl.handle.net/10754/600005en
dc.description.abstractMolecular brushes (MBs) of poly(2-oxazoline)s were prepared by living anionic polymerization of 2-isopropenyl-2-oxazoline to form the backbone and living cationic ring-opening polymerization of 2-n-propyl-2-oxazoline and 2-methyl-2-oxazoline to form random and block copolymers. Their aqueous solutions displayed a distinct thermoresponsive behavior as a function of the side-chain composition and sequence. The cloud point (CP) of MBs with random copolymer side chains is a linear function of the hydrophilic monomer content and can be modulated in a wide range. For MBs with block copolymer side chains, it was found that the block sequence had a strong and surprising effect on the CP. While MBs with a distal hydrophobic block had a CP at 70 °C, MBs with hydrophilic outer blocks already precipitated at 32 °C. Copyright © 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.subjectcloud pointen
dc.subjectliving cationic ring-opening polymerizationen
dc.subjectmolecular brushen
dc.subjectpoly(2-oxazoline)en
dc.subjectthermoresponsiveen
dc.titleThermoresponsive Poly(2-Oxazoline) Molecular Brushes by Living Ionic Polymerization: Modulation of the Cloud Point by Random and Block Copolymer Pendant Chainsen
dc.typeArticleen
dc.identifier.journalMacromolecular Chemistry and Physicsen
dc.contributor.institutionTechnische Universitat Munchen, Munich, Germanyen
dc.contributor.institutionTechnische Universitat Dresden, Dresden, Germanyen
dc.contributor.institutionCenter for Regenerative Therapies Dresden, Dresden, Germanyen
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