Abstract
Static and quasielastic light-scattering measurements of endsulfonated polyisoprene in a water in oil (w/o) microemulsions were used to characterize the structure and diffusion properties of this complex system. The hydrophilic end groups of the polymer stick to the surfactant covered oil/water interface, thus bridging the water droplets. This structure formation decreases the mobility of the aqueous nanodroplets and polymer molecules. At interdroplet distances larger than the end-to-end distance of the ionomer chain a decrease of the osmotic modulus is observed. It can be explained by a depletion force of free ionomer chains acting on the nanodroplets. With increasing polymer concentration structure formation of the microemulsion is observed at nanodroplet concentrations where the ionomer chains just fit the average separation of two nanodroplets.
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Stieber, F., Eicke, H.F. Solution of telechelic ionomers in water/AOT/oil (w/o) microemulsions: a static and dynamic light scattering study. Colloid Polym Sci 274, 826–835 (1996). https://doi.org/10.1007/BF00654740
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DOI: https://doi.org/10.1007/BF00654740