Effects of annealing on switching characteristics of VDF/TrFE copolymers

Author

Takahashi, Yoshiyuki ; Kodama, Hidekazu ; Furukawa, Takeo

Author_Institution

Fac. of Sci., Sci. Univ. of Tokyo, Japan

fYear

1994

fDate

7-9 Sep 1994

Firstpage

674

Lastpage

678

Abstract

Dynamical characteristics of the polarization reversal in vinylidene fluoride copolymers strongly depend on thermal and mechanical treatment. If a film quenched from melt is drawn and annealed above the Curie temperature T_c, polarization reversal proceeds over several decades while it is completed within one decade if annealed below T_c. X-ray measurement shows no significant difference in the crystalline structure among samples annealed at various temperatures, while SEM images reveal difference in the shape of lamellae among those samples. Dynamical properties are discussed in relation to the structure

Keywords

X-ray diffraction; annealing; dielectric hysteresis; dielectric polarisation; electrets; ferroelectric Curie temperature; ferroelectric switching; organic insulating materials; polymer blends; polymer films; polymer structure; scanning electron microscopy; Curie temperature; SEM images; VDF/TrFE copolymers; X-ray measurement; annealed; annealing; crystalline structure; drawn; dynamical properties; lamellae shape; mechanical treatment; polarization reversal; quenched from melt; switching characteristics; vinylidene fluoride copolymers; Annealing; Crystallization; Electric variables measurement; Ferroelectric materials; Optical films; Polarization; Scanning electron microscopy; Shape measurement; Temperature; X-ray imaging;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1994. (ISE 8), 8th International Symposium on

Conference_Location

Paris

Print_ISBN

0-7803-1940-0

Type

conf

DOI

10.1109/ISE.1994.514850

Filename

514850