Abstract
The effects of a graft copolymer on a water/AOT/cyclohexane oil−continuous microemulsion has been studied (AOT = sodium bis(2-ethylhexyl) sulfosuccinate). The polymer consists of a hydrophobic poly(dodecyl methacrylate) backbone with hydrophilic poly(ethylene glycol) monomethyl ether side chains. The polymer stabilizes the microemulsion phase slightly with respect to added water, and destabilizes it with respect to added cyclohexane. The average number of water molecules per droplet was determined by the time-resolved fluorescence quenching technique. The graft copolymer affects the microemulsion by increasing the size of the water droplets. The importance of droplet size and side chain-to-droplet stoichiometry for the viscosity has been examined. A maximum in the viscosity was obtained when the droplet concentration was increased progressively and the polymer concentration was kept constant. The largest viscosity enhancement was obtained for the largest droplet sizes.
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