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A Doubly Branched Nonionic Oligooxyethylene V-Amphiphile: Effect of Molecular Geometry on Liquid-Crystalline Phase Behavior, 3

โœ Scribed by Krystyna Kratzat; Claudia Schmidt; Heino Finkelmann

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
621 KB
Volume
163
Category
Article
ISSN
0021-9797

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โœฆ Synopsis

The synthesis of a double-chain nonionic surfactant, 1,3-bis(2-ethylhexyloxy)-2-propoxy-octaoxyethylene monomethyl ether, with a doubly branched lipophilic noicty is described. The lyotropic phase behavior of this surfactant with water is investigated by polarizing microscopy, and (\mathrm{X})-ray diffraction and deuterium NMR spectroscopy on (\mathrm{D}_{2} \mathrm{O})-enriched surfactant/water mixtures. A broad liquid-crystalline regime is found, which consists of two regions of different lamellar structure. Compared to other aqueous oligooxyethylene surfactants of the same hydrophilic-lipophilic balance but different molecular architecture, the phase diagram of the doubly branched amphiphile/water system shows a stabilization of the lamellar phase, confirming the strong influence of molecular geometry on lyotropic phase behavior. A 1994 Academic Press, Inc.

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โœ Krystyna Kratzat; Heino Finkelmann ๐Ÿ“‚ Article ๐Ÿ“… 1996 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 326 KB

on temperature, concentration, and, mainly, the structure of This work describes the synthesis of new branched, nonionic Vthe molecules. The influence of the molecular structure on surfactants, with the general formula C k C n GE 8 M, where C k and the shape of the micelles in the absence of micella