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A perfect match: Fast and truly random copolymerization of glycidyl ether monomers to thermoresponsive copolymers

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  • Freie Universität Berlin (FU Berlin)

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Original languageEnglish
Pages (from-to)44-53
Number of pages10
JournalMacromolecules
Volume50
Issue number1
Early online date23 Dec 2016
Publication statusPublished - 10 Jan 2017
Externally publishedYes

Abstract

Thermoresponsive and highly biocompatible poly(glycidyl ether) copolymers of glycidyl methyl ether (GME) and ethyl glycidyl ether (EGE) with adjustable molecular weight and defined end groups are synthesized by a monomer-activated anionic ring-opening polymerization with NOct4Br as initiator and i-Bu3Al as activator. In contrast to a conventional oxyanionic (nonactivated) copolymerization, higher molecular weights and a truly random incorporation of the monomers are accomplished. The monomer reactivity ratios were determined by the Kelen-Tüdõs approach to be rGME = 0.98 and rEGE = 0.95. The thermoresponsive properties of these copolymers with varying molecular weight were characterized by UV-vis transmittance and dynamic light scattering. Conformational changes of the copolymer during the phase transition on the molecular level were studied by 1H and 13C NMR spectroscopy in D2O and revealed only a partial dehydration during the collapse of the copolymer affecting both side chains and polymer backbone.

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Cite this

A perfect match: Fast and truly random copolymerization of glycidyl ether monomers to thermoresponsive copolymers. / Heinen, Silke; Rackow, Simon; Schäfer, Andreas et al.
In: Macromolecules, Vol. 50, No. 1, 10.01.2017, p. 44-53.

Research output: Contribution to journalArticleResearchpeer review

Heinen S, Rackow S, Schäfer A, Weinhart M. A perfect match: Fast and truly random copolymerization of glycidyl ether monomers to thermoresponsive copolymers. Macromolecules. 2017 Jan 10;50(1):44-53. Epub 2016 Dec 23. doi: 10.1021/acs.macromol.6b01904
Heinen, Silke ; Rackow, Simon ; Schäfer, Andreas et al. / A perfect match : Fast and truly random copolymerization of glycidyl ether monomers to thermoresponsive copolymers. In: Macromolecules. 2017 ; Vol. 50, No. 1. pp. 44-53.
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abstract = "Thermoresponsive and highly biocompatible poly(glycidyl ether) copolymers of glycidyl methyl ether (GME) and ethyl glycidyl ether (EGE) with adjustable molecular weight and defined end groups are synthesized by a monomer-activated anionic ring-opening polymerization with NOct4Br as initiator and i-Bu3Al as activator. In contrast to a conventional oxyanionic (nonactivated) copolymerization, higher molecular weights and a truly random incorporation of the monomers are accomplished. The monomer reactivity ratios were determined by the Kelen-T{\"u}d{\~o}s approach to be rGME = 0.98 and rEGE = 0.95. The thermoresponsive properties of these copolymers with varying molecular weight were characterized by UV-vis transmittance and dynamic light scattering. Conformational changes of the copolymer during the phase transition on the molecular level were studied by 1H and 13C NMR spectroscopy in D2O and revealed only a partial dehydration during the collapse of the copolymer affecting both side chains and polymer backbone.",
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Download

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AU - Heinen, Silke

AU - Rackow, Simon

AU - Schäfer, Andreas

AU - Weinhart, Marie

N1 - Publisher Copyright: © 2016 American Chemical Society.

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N2 - Thermoresponsive and highly biocompatible poly(glycidyl ether) copolymers of glycidyl methyl ether (GME) and ethyl glycidyl ether (EGE) with adjustable molecular weight and defined end groups are synthesized by a monomer-activated anionic ring-opening polymerization with NOct4Br as initiator and i-Bu3Al as activator. In contrast to a conventional oxyanionic (nonactivated) copolymerization, higher molecular weights and a truly random incorporation of the monomers are accomplished. The monomer reactivity ratios were determined by the Kelen-Tüdõs approach to be rGME = 0.98 and rEGE = 0.95. The thermoresponsive properties of these copolymers with varying molecular weight were characterized by UV-vis transmittance and dynamic light scattering. Conformational changes of the copolymer during the phase transition on the molecular level were studied by 1H and 13C NMR spectroscopy in D2O and revealed only a partial dehydration during the collapse of the copolymer affecting both side chains and polymer backbone.

AB - Thermoresponsive and highly biocompatible poly(glycidyl ether) copolymers of glycidyl methyl ether (GME) and ethyl glycidyl ether (EGE) with adjustable molecular weight and defined end groups are synthesized by a monomer-activated anionic ring-opening polymerization with NOct4Br as initiator and i-Bu3Al as activator. In contrast to a conventional oxyanionic (nonactivated) copolymerization, higher molecular weights and a truly random incorporation of the monomers are accomplished. The monomer reactivity ratios were determined by the Kelen-Tüdõs approach to be rGME = 0.98 and rEGE = 0.95. The thermoresponsive properties of these copolymers with varying molecular weight were characterized by UV-vis transmittance and dynamic light scattering. Conformational changes of the copolymer during the phase transition on the molecular level were studied by 1H and 13C NMR spectroscopy in D2O and revealed only a partial dehydration during the collapse of the copolymer affecting both side chains and polymer backbone.

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