Effect of magnetic field on phase transitions in solutions of cellulose derivatives / Vshivkov S. A.,Rusinova E. V. // POLYMER SCIENCE SERIES A. - 2008. - V. 50, l. 7. - P. 725-732.

ISSN/EISSN:

0965-545X / нет данных

Type:

Article

Abstract:

LC transitions occurring in mixtures of cyanoethyl cellulose with DMAA or DMF and hydroxypropyl cellulose with ethanol, DMAA, or water in the presence and absence of magnetic field have been studied. With an increase in the polarity of solvent molecules and a decrease in the molecular mass of the polymer, the LC phase develops at higher concentrations and lower temperatures. Under application of magnetic field, the domain structure is formed in solutions and the temperature-concentration region of the LC phase widens. Cyanoethyl cellulose and hydroxypropyl cellulose solutions are found to possess memory: after the magnetic field is switched off, the orientation of macromolecules and the increased temperature of phase transitions are preserved for many hours. As the molecular mass of the polymer is increased, the ability of macromolecules to orient themselves in the magnetic field declines. The threshold mechanism governing the effect of magnetic field on LC transitions in polymer solutions has been discovered. The critical value of magnetic intensity that brings about a shift in boundary curves is consistent with the value of H (cr) necessary for the cholesteric liquid crystal-nematic liquid crystal phase transition.

Author keywords:

HYDROXYPROPYL CELLULOSE; AQUEOUS-SOLUTIONS; MECHANICAL FIELD; WATER; BEHAVIOR; TEMPERATURES; SEPARATION; TRANSPORT; DIAGRAM

DOI:

10.1134/S0965545X08070018

Web of Science ID:

ISI:000258577600001

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUL
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	HYDROXYPROPYL CELLULOSE; AQUEOUS-SOLUTIONS; MECHANICAL FIELD; WATER; BEHAVIOR; TEMPERATURES; SEPARATION; TRANSPORT; DIAGRAM
Research-Areas	Polymer Science
Web-of-Science-Categories	Polymer Science
Author-Email	sergey.vshivkov@usu.ru
Funding-Acknowledgement	Russian Foundation for Basic Research {[}05-03-32888, 0508-17948]; US Civilian Research and Development Foundation (CRDF) {[}PG07-005-02]
Funding-Text	This work was supported by the Russian Foundation for Basic Research (project nos. 05-03-32888 and 0508-17948) and the US Civilian Research and Development Foundation (CRDF) (project no. PG07-005-02).
Number-of-Cited-References	48
Usage-Count-Since-2013	11
Journal-ISO	Polym. Sci. Ser. A
Doc-Delivery-Number	339KX