THE CHANGE OF ALCOHOL AMOUNT ON THE INTER FACE AND ITS EFFECT ON THE STRUCTURE OF P507(K) ALCOHOL N-HEPTANE WATER MICROEMULSION

The maximum solubilization of water (S-max) at various total amounts o f alcohol (V-a) in P507(K)/alcohol (N-propanol, isopropanol, n-butanol , 2-butanol, n-pentanol, 2-pentanol, n-hexanol, 3-hexanol, sec-octyl a lcohol)/n-heptane/water microemulsions was investigated. Different tre nds of the change of S-max against V-a were found, In the n-pentanol, 2-butanol, 2-pentanol, 3-hexanol and sec-octyl alcohol containing syst ems, S-max firstly increases and then becomes very low rapidly. This p henomenon was interpreted in terms of the formation of molecular solut ions. It was also found that S-max firstly increases with V-a and then remains unchanged in the n-propanol-containing system, while S-max in creases rapidly at first and then increases gradually in the isopropan ol-containing system. It was suggested that R(w), radius of water pool , is unchanged when S-max remains the same value in the former system. In the latter system, R(w) was also supposed to be unchanged when S-m ax begins to increase gradually, however, the detergentless microemuls ion forms at the same time. In the n-hexanol-containing system, there exists a peak in the S-max vs. V-a curve. It shows that there is a max imum value of I, molar ratio of alcohol to surfactant on the interface , in the system.