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Ionic-Liquid-Based Polyurethane Dispersions for Stabilizing Graphene in Water

Published online by Cambridge University Press:  19 August 2019

Harshit Gupta
Affiliation:
Coatings Research Institute, School of Engineering, Eastern Michigan University, Ypsilanti, MI 48197, USA
John Texter*
Affiliation:
Coatings Research Institute, School of Engineering, Eastern Michigan University, Ypsilanti, MI 48197, USA
*
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Abstract

Aqueous auto-dispersing polyurethane dispersions (PUDs) have recently been reported to form nanoparticulate dispersions at up to 25% by weight. Their incorporation of an ionic-liquid (IL) monomer, 1-hydroxyundecyl-3-methyl imidazolium bromide (HOC11C1ImBr) as a chain-terminating group appears to account for their auto-dispersing ability, and these PUD nanoparticles bear similarity to IL-based nanolatexes that have provided thermodynamically stable aqueous dispersions of nanocarbons. We demonstrate that these HOC11C1ImBr-based PUDs stabilize aqueous graphene dispersions at 1% by weight graphene in ultrasonicated top-down liquid phase exfoliation. Their formation quantitatively follows an analytical model of exfoliation kinetics of layered materials and a stretched exponential kinetic model. Such dispersions are ideally formulated for making nanocomposites composed of similar or compatible PUDs and other condensation polymers.

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Copyright
Copyright © Materials Research Society 2019 

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Supplementary material: PDF

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