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Effect of inorganic salts on the micellar behaviour of ethylene oxide-propylene oxide block copolymers in aqueous solution

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Abstract

The aggregation behaviour of two ethylene oxide-propylene oxide block copolymers (PEO-PPO-PEO) in aqueous solution has been investigated in the presence of added salts (KCNS, KI, KBr, KCl and KF) by viscosity, cloud point, light scattering, pulse gradient spin echo NMR, and solubilization measurements. The salts have a strong effect on the cloud points of the pluronics. Both P-85 and L-64 form micelles which increase in size and change into elongated shapes when the cloud point is approached. The changes of size and shape of the micelles, revealed by the intrinsic viscosity and rheological properties, seem to occur at the same temperature relative to the cloud point, independent of the nature of the salt. The onset of micelle formation is also shifted in the same direction as the cloud point by the salts, but by a much smaller amount.

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Author notes

  1. P. Bahadur

    Present address: Department of Chemistry, South Gujarat University, 395007, Surat, India

Authors and Affiliations

  1. Department of Chemistry, South Gujarat University, 395007, Surat, India

    K. Pandya

  2. Department of Physical Chemistry, University of Uppsala, Sweden

    M. Almgren

  3. Department of Physical Chemistry, The Royal Institute of Technology, Stockholm, Sweden

    P. Li & P. Stilbs

Authors
  1. P. Bahadur
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  2. K. Pandya
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  3. M. Almgren
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  4. P. Li
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  5. P. Stilbs
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Bahadur, P., Pandya, K., Almgren, M. et al. Effect of inorganic salts on the micellar behaviour of ethylene oxide-propylene oxide block copolymers in aqueous solution. Colloid Polym Sci 271, 657–667 (1993). https://doi.org/10.1007/BF00652828

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  • DOI: https://doi.org/10.1007/BF00652828

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