Abstract
Physicochemical interactions between linear alkylbenzene sulfonate (LAS) and various linear alcohol nonionics (NI) have been investigated. The effect of adding nonionic to LAS on critical micelle concentration (cmc), surface tension, water hardness sensitivity and detergency performance depends on both hydrophobe and hydrophile structure. The addition of low levels of a lauryl range-high EO nonionic surfactant significantly lowers cmc and causes the formation of micelles containing predominantly nonionic molecules. These mixed micelles improve hard water performance by acting as a sink for LAS and free calcium. Nonionic surfactant enhances LAS hard water performance by preventing the loss of LAS via Ca(LAS)2 precipitation, not by its own soil removal capabilities. Nonionic surfactant acts as a micelle promotion agent, while LAS remains responsible for surface and interfacial properties.
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Cox, M.F., Borys, N.F. & Matson, T.P. Interactions between LAS and nonionic surfactants. J Am Oil Chem Soc 62, 1139–1143 (1985). https://doi.org/10.1007/BF02542310
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DOI: https://doi.org/10.1007/BF02542310