Synthesis and arm dissociation in molecular stars with a spoked wheel core and bottlebrush arms.
Identifieur interne : 001059 ( Main/Exploration ); précédent : 001058; suivant : 001060Synthesis and arm dissociation in molecular stars with a spoked wheel core and bottlebrush arms.
Auteurs : Joanna Burdy Ska [États-Unis] ; Yuanchao Li ; Anant Vikas Aggarwal ; Sigurd Höger ; Sergei S. Sheiko ; Krzysztof MatyjaszewskiSource :
- Journal of the American Chemical Society [ 1520-5126 ] ; 2014.
Abstract
Unique star-like polymeric architectures composed of bottlebrush arms and a molecular spoked wheel (MSW) core were prepared by atom transfer radical polymerization (ATRP). A hexahydroxy-functionalized MSW (MSW(6-OH)) was synthesized and converted into a six-fold ATRP initiator (MSW(6-Br)). Linear chain arms were grafted from MSW(6-Br) and subsequently functionalized with ATRP moieties to form six-arm macroinitiators. Grafting of side chains from the macroinitiators yielded four different star-shaped bottlebrushes with varying lengths of arms and side chains, i.e., (450-g-20)6, (450-g-40)6, (300-g-60)6, and (300-g-150)6. Gel permeation chromatography analysis and molecular imaging by atomic force microscopy confirmed the formation of well-defined macromolecules with narrow molecular weight distributions. Upon adsorption to an aqueous substrate, the bottlebrush arms underwent prompt dissociation from the MSW core, followed by scission of covalent bonds in the bottlebrush backbones. The preferential cleavage of the arms is attributed to strong steric repulsion between bottlebrushes at the MSW branching center. Star-shaped macroinitiators may undergo aggregation which can be prevented by sonication.
DOI: 10.1021/ja506780y
PubMed: 25133316
Affiliations:
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Sheiko</name></author><author><name sortKey="Matyjaszewski, Krzysztof" sort="Matyjaszewski, Krzysztof" uniqKey="Matyjaszewski K" first="Krzysztof" last="Matyjaszewski">Krzysztof Matyjaszewski</name></author></analytic><series><title level="j">Journal of the American Chemical Society</title><idno type="eISSN">1520-5126</idno><imprint><date when="2014" type="published">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Unique star-like polymeric architectures composed of bottlebrush arms and a molecular spoked wheel (MSW) core were prepared by atom transfer radical polymerization (ATRP). A hexahydroxy-functionalized MSW (MSW(6-OH)) was synthesized and converted into a six-fold ATRP initiator (MSW(6-Br)). Linear chain arms were grafted from MSW(6-Br) and subsequently functionalized with ATRP moieties to form six-arm macroinitiators. Grafting of side chains from the macroinitiators yielded four different star-shaped bottlebrushes with varying lengths of arms and side chains, i.e., (450-g-20)6, (450-g-40)6, (300-g-60)6, and (300-g-150)6. Gel permeation chromatography analysis and molecular imaging by atomic force microscopy confirmed the formation of well-defined macromolecules with narrow molecular weight distributions. Upon adsorption to an aqueous substrate, the bottlebrush arms underwent prompt dissociation from the MSW core, followed by scission of covalent bonds in the bottlebrush backbones. The preferential cleavage of the arms is attributed to strong steric repulsion between bottlebrushes at the MSW branching center. Star-shaped macroinitiators may undergo aggregation which can be prevented by sonication.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country></list><tree><noCountry><name sortKey="Aggarwal, Anant Vikas" sort="Aggarwal, Anant Vikas" uniqKey="Aggarwal A" first="Anant Vikas" last="Aggarwal">Anant Vikas Aggarwal</name><name sortKey="Hoger, Sigurd" sort="Hoger, Sigurd" uniqKey="Hoger S" first="Sigurd" last="Höger">Sigurd Höger</name><name sortKey="Li, Yuanchao" sort="Li, Yuanchao" uniqKey="Li Y" first="Yuanchao" last="Li">Yuanchao Li</name><name sortKey="Matyjaszewski, Krzysztof" sort="Matyjaszewski, Krzysztof" uniqKey="Matyjaszewski K" first="Krzysztof" last="Matyjaszewski">Krzysztof Matyjaszewski</name><name sortKey="Sheiko, Sergei S" sort="Sheiko, Sergei S" uniqKey="Sheiko S" first="Sergei S" last="Sheiko">Sergei S. Sheiko</name></noCountry><country name="États-Unis"><noRegion><name sortKey="Burdy Ska, Joanna" sort="Burdy Ska, Joanna" uniqKey="Burdy Ska J" first="Joanna" last="Burdy Ska">Joanna Burdy Ska</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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