Abstract
This paper is focused on the influence of added polyampholyte, namely poly(N,N′-diallyl-N,N′-dimethyl-alt-maleamic carboxylate) on the inverse micellar phase range of the pseudo-ternary system consisting of toluene–pentanol (1:1)/SDS/water in dependence on the pH value and the temperature. Investigations on phase behavior have revealed that a greater extension in direction to the water-rich corner can be found at pH 4 compared to pH 9. In order to understand changes in the microstructure, polymer–surfactant interactions in dependence on pH have been examined by means of diffusion-ordered spectroscopy, differential scanning calorimetry, as well as conductivity measurements. The results have proven that the present microemulsion consists of water-in-oil droplets, with the polyampholyte located more in the inner core of the water droplets at pH 9 rather than at the interphase of the surfactant film at pH 4.
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Supplementary Fig. S6
Partial phase diagram of the L2 phase of the quasi ternary system toluene–pentanol (1:1)/SDS/water or 10 wt.% of PalH at pH 4 (a) and pH 9 (b) determined at 25 and 40 °C (GIF 144 kb)
Supplementary Fig. S7
Partial phase diagram of the L2 phase of the quasi ternary system toluene–pentanol (1:1)/SDS/water or 10 wt.% of PalH at pH 4 (a) and pH 9 (b) determined at 25 and 40 °C (GIF 141 kb)
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Fechner, M., Kramer, M., Kleinpeter, E. et al. Polyampholyte-modified ionic microemulsions. Colloid Polym Sci 287, 1145–1153 (2009). https://doi.org/10.1007/s00396-009-2074-4
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DOI: https://doi.org/10.1007/s00396-009-2074-4