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Phase behaviour of alkanolammonium carboxylates
YKI – Ytkemiska institutet.
1992 (English)In: Progress in Colloid and Polymer Science, ISSN 0340-255X, E-ISSN 1437-8027, Vol. 88, 18-22 p.Article in journal (Refereed)
Abstract [en]

Partial binary phase diagrams for thirteen different alkanolammonium carboxylates with water have been determined. The alkanolamines employed were monoethanolamine, triethanolamine and triisopropanol--amine, while the fatty acid has been varied with respect to chain length (C8 - C22) and saturation. The phase diagrams show the features that distinguish them from ordinary soap-water phase diagrams. First, multi-phase regions and miscibility gaps occur at low concentrations of surfactant, in particular for triethanolammonium carboxylates. Secondly, the stability regions of the liquid crystalline phases are different, and in general smaller com--pared to those formed by the corresponding alkali carboxylates. It is suggested that the first feature is due to that alkanolamines are weak bases and thus, that any surfactant aggregate comprises a few percent of unhydrolyzed acid, while the second feature is attributed to the larger size of the counterion compared to alkali ions, which tends to destabilize ordered structures.

Place, publisher, year, edition, pages
1992. Vol. 88, 18-22 p.
Keyword [en]
Alkanolamine, phase diagram, alkanolammonium carboxylate
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27417OAI: oai:DiVA.org:ri-27417DiVA: diva2:1054421
Note
A741Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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