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Amphiphilic telechelic poly(N-isopropylacrylamide) in water: From micelles to gels⋆

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Abstract.

We report the first study of aqueous solutions (0.025 gL-1 to 46 gL-1) of a telechelic poly(N-isopropylacrylamide) with octadecyl termini (C18-PNIPAM-C18, Mw: 37000, 320 NIPAM units, Mw/ Mn = 1.07) obtained by reversible addition-fragmentation chain transfer (RAFT) free radical polymerization of N-isopropylacrylamide. Static and dynamic light scattering measurements and fluorescence spectroscopy, using 8-anilino-1-naphthalenesulfonic acid (ANS) as probe, yielded the concentration dependence of the size and aggregation number of C18-PNIPAM-C18 micelles in cold ( 20°C) dilute aqueous solutions. Concentrated solutions ( c > 20gL-1) form transient gels exhibiting an oscillatory shear behavior that can be approximated by a single-relaxation Maxwellian model. Aqueous solutions of C18-PNIPAM-C18 undergo a phase transition upon heating to 31.5°C as determined by microcalorimetry. The heat-induced phase separation of dilute (0.025 gL-1) C18-PNIPAM-C18 solutions yields a fluid that is colloidally stable at temperatures higher than 33°C. The overall results are consistent with a model assuming the formation of flowerlike micelles in the dilute regime and a network of micelles connected by telechelic chains in the concentrated regime.

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Authors and Affiliations

  1. Department of Chemistry and Faculty of Pharmacy, University of Montreal, Succursale Centre Ville, CP 6128, H3C 3J7, Montreal, QC, Canada

    P. Kujawa & F. M. Winnik

  2. Institute for Chemical Research, Kyoto University, 611-0011, Uji, Kyoto, Japan

    H. Watanabe

  3. Department of Polymer Chemistry, Kyoto University, 615-8510, Katsura, Nishikyo-ku, Kyoto, Japan

    F. Tanaka

Authors
  1. P. Kujawa
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  2. H. Watanabe
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  3. F. Tanaka
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  4. F. M. Winnik
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Correspondence to F. M. Winnik.

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Kujawa, P., Watanabe, H., Tanaka, F. et al. Amphiphilic telechelic poly(N-isopropylacrylamide) in water: From micelles to gels⋆. Eur. Phys. J. E 17, 129–137 (2005). https://doi.org/10.1140/epje/i2004-10134-9

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