Systematic Comparison of Single-Walled Carbon Nanotube/ Poly(vinyl Acetate) Graft-to Reactions

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Title: Systematic Comparison of Single-Walled Carbon Nanotube/ Poly(vinyl Acetate) Graft-to Reactions
Authors: Clancy, AJ
Serginson, JM
Greenfield, JL
Shaffer, MSP
Item Type: Journal Article
Abstract: The covalent grafting of polymers to single-walled carbon nanotubes (SWCNTs) is widely used to improve solvent compatibility, as well as composite and functional performance. Here, three different graft-to strategies are directly compared, using azide, diazonium, and bromide terminated polymers, over four different molecular weights (oligomeric to 10 kDa) using specifically synthesized low polydispersity, end-group controlled poly(vinyl acetate) (PVAc) prepared by polymerisation using a bespoke protected-amine RAFT agent. Coupling of the bromo-polymer to reduced SWCNTs led to higher degrees of functionalisation (grafting ratios up to 68.9%) than the azide and diazonium grafting reactions, attributed to better initial dispersion of the pre-grafted SWCNTs. The use of higher molecular weight polymers led to a decrease in the total weight of polymer grafted, as the increase in per-polymer weight is more than offset by steric occlusion on the SWCNT surface. For these graft-to reactions, the dispersibility of grafted SWCNTs was found to depend most strongly on the polymer molecular weight, not total weight of grafted polymer or grafting chemistry, with an intermediate Mn∼5757 PVAc giving the best dispersibilities, at up to 118 mg L−1.
Issue Date: 23-Oct-2017
Date of Acceptance: 21-Oct-2017
ISSN: 0032-3861
Publisher: Elsevier
Start Page: 263
End Page: 271
Journal / Book Title: Polymer
Volume: 133
Copyright Statement: © 2017, Elsevier Ltd. All rights reserved. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: AERO/RB1527
Keywords: 03 Chemical Sciences
09 Engineering
Publication Status: Published
Appears in Collections:Chemistry
Faculty of Natural Sciences

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