Abstract
AbstractAnionic extended surfactants of the alkyl polypropylene oxide sulfate type are found to obey the linear correlation lnS =kACN for optimum formulation (three‐phase behavior) of ionic surfactant–oil–water systems, with akvalue essentially the same as forn‐alkyl sulfates. The addition ofn‐pentanol produces a shift in optimum formulation without significant change ink. An increase in temperature is found to produce a decrease in surfactant hydrophilicity, which is opposite to the expected behavior of anionic species. This trend, which is typical of nonionic surfactant behavior, is probably due to the partial hydration of the very first propylene oxide units which are located close to the anionic head group.
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