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International Journal of Polymer Science
Volume 2012 (2012), Article ID 592759, 16 pages
http://dx.doi.org/10.1155/2012/592759
Review Article

Nanospheres Prepared by Self-Assembly of Random Copolymers in Supercritical Carbon Dioxide

Department of Environmental and Life Sciences, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan

Received 19 August 2011; Accepted 28 November 2011

Academic Editor: Takashi Kaneko

Copyright © 2012 Eri Yoshida. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The synthesis of spherical particles was attained by the direct self-assembly of poly[2-(perfluorooctyl)ethyl acrylate-random-acrylic acid], P(POA-r-AA), and by the indirect self-assembly poly[POA-random-2-(dimethylamino)ethyl acrylate], P(POA-r-DAA), with dicarboxylic acids in supercritical carbon dioxide (scCO2). The copolymers formed spherical particles with hundreds of nanometer diameters in a heterogeneous state at pressures lower than the cloud point pressure. The formation of spherical particles was also dependent on the temperature. The formation of spherical particles could be optimized through varying the solvent quality by the manipulation of the CO2 pressure and temperature for the different copolymer compositions. The dynamic light scattering and 1H NMR studies demonstrated that the nanospheres had the micellar structures consisting of the CO2-philic POA shells and the CO2-phobic AA or DAA cores including the main chain cores. The nanospheres produced the superhydrophobic surfaces based on the water-proof shells of the POA units.