INTERACTION OF ALPHA-HYDRO-OMEGA-HYDROXYPOLY(OXY-1,2-ETHANEDIYL) WITH WATER-IN-OIL MICROEMULSIONS .2. MEDIUM-SIZE POLYMER-CHAIN - CYCLOHEXANE AND TOLUENE MICROEMULSIONS

Water-in-oil microemulsions composed of cyclohexane or toluene, sodium dodecyl sulfate, 1-pentanol, and water have been prepared by choosing compositions close to the demixion line in the pseudoternary phase diagrams. The microemulsions were either in the electric nonpercolating or in the electric percolating domain. Their properties were studied by luminescence probing, quasi-elastic light scattering, and electrical conductivity measurements both in the absence and in the presence of alpha-hydro-omega-hydroxypoly(oxy-1,2-ethanediyl), MW 6000. Cyclohexane and toluene microemulsions behave in a similar manner, with differences only in the absolute values of the observed parameters. In the presence of polymer, the number of droplets decreases, their size increases, the apparent hydrodynamic radius increases, and the electric conductivity decreases. Due to the decrease of the number of droplets, the probability of an immediate encounter between a luminophore and a quencher increases in the presence of polymer. However, the overall quenching efficiency then decreases, due to a partial immobilization of the reactants by the polymer. In other words, the diffusion of the reactants is reduced in the presence of polymer.