High frequency dielectric investigation of ferroelectric and melting transitions of vinylidene fluoride copolymers

Author

Johnson, G.E. ; Anderson, E.W. ; Furukawa, T. ; Tajitsu, Y.

Author_Institution

AT&T Bell Labs., Murray Hill, NJ, USA

fYear

1991

fDate

8-12 Jul 1991

Firstpage

782

Abstract

The ferroelectric, paraelectric, and melt regime relaxation behaviors of copolymers of vinylidene fluoride with both trifluoroethylene and tetrafluoroethylene have been studied in the 1 to 1000 MHz range from 25 to 160 °C. The data were fitted to obtain both the transition strength and characteristic relaxation time as a function of temperature. The observed temperature-dependent properties are consistent with a cooperative two-site model. The remnant polarization of the ferroelectric is lost in the paraelectric regime and then cooperatively is lost in the melt with the loss of crystalline order

Keywords

dielectric relaxation; ferroelectric transitions; melting; polymer blends; 1 to 1000 MHz; 25 to 160 degC; characteristic relaxation time; cooperative two-site model; ferroelectric transitions; melting transitions; paraelectric regime; relaxation behaviors; remnant polarization; temperature-dependent properties; tetrafluoroethylene; transition strength; trifluoroethylene; vinylidene fluoride copolymers; Automatic control; Crystallization; Dielectrics; Ferroelectric materials; Frequency; Impedance; Influenza; Liquid crystal displays; Liquid crystal polymers; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on

Conference_Location

Tokyo

Print_ISBN

0-87942-568-7

Type

conf

DOI

10.1109/ICPADM.1991.172183

Filename

172183