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Nonionic surfactant phase behavior. The effect of CH3 capping of the terminal OH. Accurate measurements of cloud curves

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Surfactants and Macromolecules: Self-Assembly at Interfaces and in Bulk

Part of the book series: Progress in Colloid & Polymer Science ((PROGCOLLOID,volume 82))

Abstract

Phase diagrams have been determined by optical microscopy for several polyoxyethylene surfactants where the terminal OH group is replaced by OMe (surfactants denoted CnEOmOMe). The derivatives studied were C12EO4OMe, C12EO6OMe, and C12EO8OMe. In addition, a phase diagram is given for the conventional nonionic C12EO2. Changing OH to OMe has a drastic effect on phase behavior at higher temperatures (>50°C), reducing mesophase upper temperature limits and the cloud temperture (T c ) by 20–30°C. Phase transitions that occur below 20°C and the mesophase sequence with increaseing surfactant concentrations are almost unaltered by Me substitution. Accurate cloud-curve measurements are reported for C8EO4, C12EO4, C12EO8, C16EO6, C16EO8, and C22=EO6 (hexaethylene glycol-cis-13-docosenyl ether, erucyl EO6). From these curves, accurate values of the critical surfactant concentration and temperature for the lower consolute boundary are derived. All the data support the hypothesis that two very different processes exist for nonionic surfactant clouding, one due to critical dewetting of EO chains (similar to EO polymer clouding) and the second arising from a rod/disc micelle shape change. Finally, surfactant self-diffusion measurements are reported for the two reversed bicontinuous cubic (V 2) phases of C12EO2. These are similar for both phases and to not allow any structural difference to be determined.

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Author information

Authors and Affiliations

  1. Dept of Physical Chemistry, Universityof Umeå, Sweden

    G. Lindblom

  2. Unilever Research Port Sunlight Laboratory Port Sunslight, L63 35W, Merseyside, United Kingdom

    J. P. Conroy, C. Hall, C. A. Leng, K. Rendall, G. J. T. Tiddy, J. Walsh & G. Lindblom

Authors
  1. J. P. Conroy
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  2. C. Hall
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  3. C. A. Leng
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  4. K. Rendall
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  5. G. J. T. Tiddy
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  6. J. Walsh
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  7. G. Lindblom
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Editor information

B. Lindman J. B. Rosenholm P. Stenius

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© 1990 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG

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Conroy, J.P. et al. (1990). Nonionic surfactant phase behavior. The effect of CH3 capping of the terminal OH. Accurate measurements of cloud curves. In: Lindman, B., Rosenholm, J.B., Stenius, P. (eds) Surfactants and Macromolecules: Self-Assembly at Interfaces and in Bulk. Progress in Colloid & Polymer Science, vol 82. Steinkopff. https://doi.org/10.1007/BFb0118266

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  • DOI: https://doi.org/10.1007/BFb0118266

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  • Publisher Name: Steinkopff

  • Print ISBN: 978-3-7985-0838-5

  • Online ISBN: 978-3-7985-1688-5

  • eBook Packages: Springer Book Archive

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