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Poly(tetrabutylphosphonium 4-styrenesulfonate) was found to be a unique poly(ionic liquid) showing tunable lower critical solution temperatures in aqueous solution, depending on concentration and ionic strength. As this polymer also exhibits a very high stabilizing power for carbon nanostructures, one can readily synthesize an environment-sensitive graphene dispersion.
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Men et al. (2012) studied this question.
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