Journal
COLLOID AND POLYMER SCIENCE
Volume 287, Issue 10, Pages 1145-1153Publisher
SPRINGER
DOI: 10.1007/s00396-009-2074-4
Keywords
Microemulsions; Polyampholyte; Polyampholyte-surfactant interactions
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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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