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Preparation of light-stable micelles with azo dyes from a nonamphiphilic random block copolymer

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Abstract

Light-stable micelles with azo dyes were prepared by micelle formation of a nonamphiphilic diblock copolymer containing azobenzene and UV absorbent at ca. 1 mol% as the unit ratios. The nonamphiphilic block copolymer consists of two different kinds of random copolymer blocks: poly[4-(phenylazophenoxymethyl)styrene-co-vinylphenol] (P(AS-co-VPh)) and poly[4-(2-hydroxybenzophenoxymethyl)styrene-co-styrene] (P(HBS-co-St)). This random block copolymer, P(AS-co-VPh)-b-P(HBS-co-St) formed the micelles in the presence of 1,4-butanediamine (BDA) through hydrogen bond cross-linking between the VPh units via BDA. The micelles had the azobenzene moieties at the cores and the UV absorbents at the coronas. The micelles showed a small color difference in color fading experiments, in comparison with the unimers and with micelles having no UV absorbent at the coronas. It is significant that the diblock copolymer forms the micelles and has the UV absorbents at the coronas to suppress the color fading. Furthermore, the chain length of α,ω-diamines had no effect on the hydrodynamic radius of the micelles, but affected the aggregation number and the cmc.

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Acknowledgements

We acknowledge the support of Mr. Seiji Sugimori at Ipposha Oil Industries Co., Ltd. for the dye fading and color difference experiments.

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  1. Eri Yoshida

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

Authors and Affiliations

  1. Department of Polymer Science and Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo, Kyoto, 606-8585, Japan

    Eri Yoshida & Masayo Ohta

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  1. Eri Yoshida
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  2. Masayo Ohta
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Correspondence to Eri Yoshida.

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Yoshida, E., Ohta, M. Preparation of light-stable micelles with azo dyes from a nonamphiphilic random block copolymer. Colloid Polym Sci 283, 872–879 (2005). https://doi.org/10.1007/s00396-004-1229-6

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  • DOI: https://doi.org/10.1007/s00396-004-1229-6

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