Monolayer and multilayer of a liquid crystal copolysiloxane at the air-water interface

Citation
J. Mu et al., Monolayer and multilayer of a liquid crystal copolysiloxane at the air-water interface, COLL SURF A, 172(1-3), 2000, pp. 87-90
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
ISSN journal
0927-7757 → ACNP
Volume
172
Issue
1-3
Year of publication
2000
Pages
87 - 90
Database
ISI
SICI code
0927-7757(20001025)172:1-3<87:MAMOAL>2.0.ZU;2-Y
Abstract
This paper describes the phase transition behavior of a copolysiloxane (1) bearing a 4-cyanophenyl benzoate core at the terminal of the side chain. Wh ile polymer 1 exhibits only a nematic phase in bulk, it easily forms layer structures involving monolayer, trilayer, and complex multilayers at the ai r-water interface. In the monolayer state the cyano groups are anchored on the water surface and the aromatic moieties involving the copolysiloxane ch ain are directed towards the air phase. The trilayer has a partially bilaye r structure on the top of the monolayer, where the layer structure was conf irmed by X-ray diffraction measurement of the LB films, giving the layer sp acing of 1.47 times of the calculated side chain length. Complex multilayer transitions were also observed by a further compression or changing subpha se temperature. (C) 2000 Elsevier Science B.V. All rights reserved.