Systematic comparison of single-walled carbon nanotube/poly(vinyl acetate) graft-to reactions

POLYMER

卷:133

Article

Clancy, Adam J.¹  Serginson, James M.^1,2  Greenfield, Jake L.^1,2  Shaffer, Milo S. P.^1,2 

[1] Imperial Coll London, Dept Chem, London Ctr Nanotechnol, South Kensington Campus, London SW7 2AZ, England

[2] Imperial Coll London, Dept Mat, London Ctr Nanotechnol, South Kensington Campus, London SW7 2AZ, England

关键词: Nanotube;    Graft;    PVAc;   

DOI  :  10.1016/j.polymer.2017.10.047

来源: Elsevier

【 摘 要 】

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 M-n similar to 5757 PVAc giving the best dispersibilities, at up to 118 mg L-1. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

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