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M., Kołodziejczyk, A. Redliński, M. Zgoda



Poly(oxyethylene) mono- and polyol series surfactants. Part I. The hydrophilic–lipophilic equilibrium in relation to the surface activity type of oxyethylenated lauryl alcohols and oleyl alkohol derivatives of tire R-[OCH2CH2]n-OH series

Polimery 1998, No 5, 307


DOI: dx.doi.org/10.14314/polimery.1998.307


Summary

Polish non-ionic surfactants of the homologous series of oxyethylenated derivatives of oleyl and lauryl alcohols (Rokanols O, L, LK and DB) were submitted to fundamental physicochemical examination. The Griffin, Davies, Atlas Co. and the 1H-NMR methods were used to study the structural level of the hydrophilic—lipophilic equilibrium. The hydrophile/lipophile segments ratio (H/L) was determined. The molecular structure of the non-ionics was characterized in terms of ΣIC- and ΣSIC-values. Surface activity data were determined for aqueous micellar solutions of Rokanols, viz., the critical micelle concentration (cmc), the free energy of micelle formation (AG°m), Hildebrand's solubility parameter at cmc (δcmc), and the HLB equilibrium in the cmc region (HLBcmc). Brij non-ionics (imported) were submitted to identical examination. The data obtained allowed to distinguish the emulsifying from the solubilizing properties of the non-ionics examined. Up to HLB < 13 (after Griffin), non-ionic surfactants usually exhibit emulsifying properties; at HLB > 13, the solubilizing properties are becoming increasingly intensive. Rokanols, which are Polish counterparts of the Brij surfactants, approximate the latter in the ability to reduce surface tension, to emulsify and to solubilize. They are only slightly toxic (сf. Table 8, column LD50), much less so than are the Brijs. This makes Rokanols promising for applications in drug-form technologies and also in personal care and medical cosmetics.


Keywords: surface-active agents, oxyethylenated derivatives of lauryl and oleyl alcohols, structural level of hydrophilic-lipophilic equilibrium, critical micelle concentration, surface tension


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