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Orientation of crystallites in piezoelectric poly(vinylidene fluoride)

 

作者: Lenn C. Kupferberg,  

 

期刊: Journal of Applied Physics  (AIP Available online 1988)
卷期: Volume 64, issue 5  

页码: 2316-2323

 

ISSN:0021-8979

 

年代: 1988

 

DOI:10.1063/1.341661

 

出版商: AIP

 

数据来源: AIP

 

摘要:

The distribution of the orientation of thebandcaxes of crystallites in the piezoelectric polymer, poly(vinylidene fluoride), is inferred from the distribution (with varying sample orientation) of diffracted x‐ray intensity of the (111) and (001) reflections. Measurements of drawn and poled samples are reported, and results from these measurements as well as those for rolled material are analyzed. Thecaxes of the crystallites are narrowly distributed about the drawing (or rolling) direction. Thebaxes are broadly disturbed in the plane perpendicular to the drawing (rolling) direction. The effects of drawing, rolling, poling, and thermal aging upon the distribution of crystallite orientations are discussed. The distribution of dipole orientations and the resulting net polarizations are calculated, using fast Fourier transforms to deconvolve the diffraction data. A model is proposed, for the distribution of thebaxes, and is found to fit the data well in most cases. The correlation between the alignment of crystallographic axes and the piezoelectric constants is discussed. Possible improvement in the net polarization of the polymer of a factor of 2 is suggested.

 

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