首页
按字顺浏览
期刊浏览
卷期浏览
Temperature dependence of elastic, dielectric, and piezoelectric properties of “s...
|
Temperature dependence of elastic, dielectric, and piezoelectric properties of “single crystalline’’ films of vinylidene fluoride trifluoroethylene copolymer
作者:
Kenji Omote,
Hiroji Ohigashi,
Keiko Koga,
期刊:
Journal of Applied Physics
(AIP Available online 1997)
卷期:
Volume 81,
issue 6
页码: 2760-2769
ISSN:0021-8979
年代: 1997
DOI:10.1063/1.364300
出版商: AIP
数据来源: AIP
摘要:
Elastic, dielectric, and piezoelectric constant matrix elements of a “single crystalline’’ (SC) film of vinylidene fluoride trifluoroethylene copolymer, P(VDF/TrFE), in which the orthorhombic [001] and [110] axes of fully extended chain crystals are preferentially oriented parallel to the stretching axis and normal to the surface, respectively, were measured at temperatures ranging from 10 K to the Curie point (402–404 K) by using a piezoelectric resonance method. All of the electromechanical coupling factors (k31,k32,k33,k24, andk15) are larger than those of conventional lamellar crystalline films. Some of the matrix elements for a P(VDF/TrFE) single crystal are derived from the measured values of constant matrix elements for the SC film. Some features characteristic of the SC film are revealed. The SC film has a large Young’s modulus for the stretching direction (1/s11) (121 GPa at 10 K). The properties related to the molecular motions along the chain axis, such as 1/s11, shear stiffness constantc55, shear piezoelectric constante15, etc., exhibit strong relaxations around 250 K. The origin of these relaxations in the crystalline phase is discussed. ©1997 American Institute of Physics.
点击下载:
PDF
(223KB)
返 回
|
|