INFLUENCE OF 1,3-BUTYLENEGLYCOL ON THE FORMATION OF MICROEMULSIONS OAV IN THE SYSTEM WITH WATER, SODIUM DODECYL SULFATE AND PENTANOL

The influence that 1,3-butyleneglycol incorporated as polar cosolvent in the aqueous phase determine on the O/W micromulsion region of the classical system water/sodium dodecyl sulfate/pentanol/heptane, has been studied. Phase diagrams corresponding to aqueous phases made of water/butyleneglycol in ratios 90/10 and 75/25 are compared with the typical system with water. The resulting increase on the O/W microemulsion region for the systems including the glycol, provides a security margin to prepare such compositions with respect to the narrow channel of solubility described for the conventional system. Although the presence of butyleneglycol lead to a shift in the optimal ratio between the aqueous phase and SDS from the 85/15 described for the typical system to higher proportions in surfactant, the simplicity of preparation of such O/W microemulsions could compensate the higher amount of SDS required.