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Convenient synthesis of microspheres by self-assembly of random copolymers in supercritical carbon dioxide

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Abstract

A novel and convenient synthesis of microspheres was attained by molecular self-assembly of random copolymers in supercritical carbon dioxide. Poly{2-(perfluorooctyl)ethyl acrylate-ran-2-(dimethylamino)ethyl acrylate} random copolymers (P[POA-r-DAA]), with 7:3, 8:2, and 9:1 as the molar ratios of 2-(perfluorooctyl)ethyl acrylate (POA)/2-(dimethylamino)ethyl acrylate (DAA), were soluble in supercritical CO2 and had their cloud points at about 75 bar higher than the critical pressure of CO2. The CO2 density at the cloud points decreased with an increase in temperature. Although the copolymers made a slight difference in the cloud point in the absence of perfluoroazelaic acid (PA), they made a marked difference in the presence of PA. The copolymer with a lower DAA content had a cloud point at lower CO2 density. The scanning electron microscopy observation demonstrated that the copolymers produced microspheres in the presence of PA at 0.5 as PA/DAA in the heterogeneous state below the cloud points. The microspheres were unstable to pressure and changed to unspecific forms as a result of increasing the CO2 pressure, although the microspheres were stable to temperature. The POA/DAA ratio in the copolymer had effect not only on the cloud point but also on the size of the microspheres. The copolymer with a lower DAA content formed smaller microspheres.

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Acknowledgement

We are thankful for the JSPS Grant-in-aid for Science Research #16510086, Amano Engineering and Technology Center, and the grant for young researchers project of the Research Center for Future Technology, Toyohashi University of Technology, for the financial support of this work.

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Authors and Affiliations

  1. Department of Materials Science, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi, 441-8580, Japan

    Eri Yoshida & Akito Nagakubo

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  1. Eri Yoshida
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  2. Akito Nagakubo
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Correspondence to Eri Yoshida.

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Yoshida, E., Nagakubo, A. Convenient synthesis of microspheres by self-assembly of random copolymers in supercritical carbon dioxide. Colloid Polym Sci 285, 441–447 (2007). https://doi.org/10.1007/s00396-006-1602-8

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  • DOI: https://doi.org/10.1007/s00396-006-1602-8

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