Shape Dependence in the Formation of Condensed Phases Exhibited by Disubstituted Sucrose Esters

✍ Scribed by Valérie Molinier; Paul J. J. Kouwer; Juliette Fitremann; Alain Bouchu; Grahame Mackenzie; Yves Queneau; John W. Goodby

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 701 KB
• Volume: 13
• Category: Article
• ISSN: 0947-6539
• DOI: 10.1002/chem.200600368

✦ Synopsis

Abstract

We report on the self‐organizing properties of sucrose esters that are di‐(1′,6′, 1′,6, and 6,6′)‐substituted with aliphatic chains of identical or different chain lengths and levels of saturation. For the materials possessing two saturated aliphatic chains, the compounds exhibited thermotropic lamellar smectic A phases. A remarkable new phase transition was observed for the di‐octadecanoyl homologue in which one smectic A phase transformed into another with a continuous change in layer spacing, but with a discontinuous change in the correlation length. The incorporation of long cis‐unsaturated chains led to increased cross‐sectional areas of the chains relative to the sucrose head groups and, hence, columnar phases were observed.