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Functionalization of Single-Walled Carbon Nanotubes with Well-Defined Polymers by Radical Coupling

2005; American Chemical Society; Volume: 38; Issue: 4 Linguagem: Inglês

10.1021/ma048273s

1520-5835

Yuanqin Liu, Zhaoling Yao, Alex Adronov,

Polymer Nanocomposites and Properties

Polystyrene and poly[(tert-butyl acrylate)-b-styrene] with well-defined molecular weights and polydispersities were prepared by nitroxide-mediated free-radical polymerization. The homopolymers and block copolymers were used to functionalize shortened single-walled carbon nanotubes (SWNTs) through a radical coupling reaction involving polymer-centered radicals generated at 125 °C via loss of the stable free-radical nitroxide capping agent. The resulting polymer−SWNT composites were fully characterized and were found to be highly soluble in a variety of organic solvents. This solubility could also be altered through chemical modification of the appended polymers. The tert-butyl groups of appended poly[(tert-butyl acrylate)-b-styrene] could be removed to produce poly[(acrylic acid)-b-styrene]-functionalized carbon nanotubes. The resulting composite was found to form aggregates in a mixture of chloroform/methanol (v/v: 1/1) as determined by dynamic light scattering.