Micelle formation of polystyrene-block-poly(4-tert-butoxystyrene) in hexane |
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Authors: | Eri Yoshida Tomoyuki Ema |
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Affiliation: | (1) Department of Environmental and Life Sciences, Toyohashi University of Technology, 1–1 Hibarigaoka, Tempaku-cho, Toyohashi Aichi, 441-8580, Japan;(2) Department of Materials Science, Toyohashi University of Technology, 1–1 Hibarigaoka, Tempaku-cho, Toyohashi Aichi, 441-8580, Japan |
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Abstract: | A new type of hexane-soluble polymeric surfactant based on poly(4-tert-butoxystyrene) (P t BSt) was prepared by the nitroxide-mediated living radical polymerization, and their self-assemblies in hexane were explored. Polystyrene-block-P t BSt diblock copolymers with six different P t BSt block lengths were obtained by the sequential living radical polymerization of styrene followed by 4-tert-butoxystyrene using 4-methoxy-2,2,6,6-tetramethylpiperidine-1-oxyl as the mediator; Mn(P t BSt block) = 13,500, 21,700, 26,600, 47,500, 91,300, and 108,000 at the constant length of the PSt block (Mn = 12,900). Dynamic light-scattering studies demonstrated that the copolymers self-assembled into monodispersed spherical micelles in hexane. The hydrodynamic diameter of the micelles increased with an increase in the P t BSt block length. The micellar size also increased as the copolymer concentration increased. However, the size decreased as a result of the increasing temperature due to a decrease in the aggregation number. The 1H NMR analysis confirmed that the copolymers formed micelles with PSt cores. |
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