Langmuir and Langmuir-Blodgett films of fluorine-containing side chain liquid crystal copolysiloxanes

Citation
J. Mu et al., Langmuir and Langmuir-Blodgett films of fluorine-containing side chain liquid crystal copolysiloxanes, THIN SOL FI, 372(1-2), 2000, pp. 240-245
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
THIN SOLID FILMS
ISSN journal
0040-6090 → ACNP
Volume
372
Issue
1-2
Year of publication
2000
Pages
240 - 245
Database
ISI
SICI code
0040-6090(20000822)372:1-2<240:LALFOF>2.0.ZU;2-E
Abstract
The Langmuir film behavior of fluorine-containing side chain liquid crystal copolysiloxanes at the air-water interface has been studied over a tempera ture range of 277.5-310 K. The surface pressure-area isotherms exhibited a transition from an expanded to a condensed phase. In the expanded phases th e main chains of the polymers were anchored at the air-water interface. In the condensed phases the extension or partial exclusion of the main chains at the air-water interface was mainly controlled by the cross-sectional are a of the side chain. The transferred Langmuir-Blodgett (LB) multilayer did not give any X-ray diffraction peak. With heating, a molecular ordering of the LB film was induced so that the film showed the Bragg diffraction peak. (C) 2000 Elsevier Science S.A. All rights reserved.