Title :
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
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 Tc, polarization reversal proceeds over several decades while it is completed within one decade if annealed below Tc. 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;
Conference_Titel :
Electrets, 1994. (ISE 8), 8th International Symposium on
Conference_Location :
Paris
Print_ISBN :
0-7803-1940-0
DOI :
10.1109/ISE.1994.514850
