Brominated graphene as a versatile precursor for multifunctional grafting

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Title: Brominated graphene as a versatile precursor for multifunctional grafting
Authors: Au, H
Rubio, N
Shaffer, MSP
Item Type: Journal Article
Abstract: A non-destructive and versatile chemical reduction method was used to dissolve and subsequently brominate few-layer graphene sheets (FLGs); the direct covalent attachment of bromine to the graphene framework was demonstrated by X-ray photoelectron spectroscopy (XPS). The brominated few-layer graphenes (FLG-Br) provide a convenient, stable, liquid-phase precursor, suitable for the synthesis of a variety of directly functionalised graphenes. As an example, the FLG-Br species was used to initiate atom transfer radical polymerisation (ATRP), to obtain poly(methyl methacrylate) (PMMA)-grafted graphene (FLG-PMMA), which was six times more dispersible in acetone than controls. In addition, the FLG-Br is active for nucleophilic substitution reactions, as illustrated by the preparation of methoxypolyethylene glycol (mPEG)- and OH-substituted derivatives. The products were characterised by thermogravimetric analysis coupled with mass spectrometry (TGA-MS), XPS and Raman spectroscopy. Grafting ratios (GR) for these polymer-grafted materials varied between 6 and 25%; even at these GRs, all graphene derivatives showed increased solubility in organic solvents.
Issue Date: 7-Jan-2018
Date of Acceptance: 29-Sep-2017
URI: http://hdl.handle.net/10044/1/56800
DOI: https://dx.doi.org/10.1039/c7sc03455e
ISSN: 2041-6520
Publisher: Royal Society of Chemistry
Start Page: 209
End Page: 217
Journal / Book Title: Chemical Science
Volume: 9
Issue: 1
Copyright Statement: This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry
WALLED CARBON NANOTUBES
GRAPHITE-INTERCALATION COMPOUNDS
TRANSFER RADICAL POLYMERIZATION
IN-SITU POLYMERIZATION
RAMAN-SPECTROSCOPY
MOLECULAR-WEIGHT
FUNCTIONALIZATION
COVALENT
CHEMISTRY
OXIDE
Publication Status: Published
Appears in Collections:Chemistry
Faculty of Natural Sciences



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