Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 27, Issue 13, Pages 1073-1078Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.200600163
Keywords
block copolymer; dispersions; single-walled carbon nanotubes
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The use of the block copolymers polystyrene-block-poly(ethylene oxide) and poly(methyl methacrylate)block-poly(ethylene oxide) is described to assist the direct solubilization of single-walled carbon nanotubes (SWNTs) into water under ultrasonic irradiation. As compared to surfactants and homopolymers, the block copolymer systems may offer the potential of additional unique morphologies through self-assembly. TEM and AFM analyses of solution-cast samples indicate exfoliation and wetting of the SWNTs by the block copolymer. With increasing duration of ultrasonic irradiation, an increase in solution viscosity is initially found, which suggests that it is a convenient indicator of the progress of exfoliation of the SWNTs. With increasing duration of ultrasonic irradiation, an increase in solution viscosity is initially found, which suggests that it is a convenient indicator of the progress of exfoliation of the SWNTs. With continued intense ultrasonic irradiation, the solution viscosity may decrease apparently because of damage/breakage of the SWNTs.
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