Process for producing polymeric piezoelectric elements and the a

Details Process for producing polymeric piezoelectric elements and the a Process for producing polymeric piezoelectric elements and the a

1974-03-11

1976-01-06

Weiffenbach, Cameron K.

Stock material or miscellaneous articles

Composite

Of fluorinated addition polymer from unsaturated monomers

427 12, 427100, 427124, 427171, 427379, 427380, 427385, 428457, B05D 512, B32B 2700

Patent

active

039314464

ABSTRACT:
A highly piezoelectric polyvinylidene fluoride element is prepared by treating a polyvinylidene fluoride film having an infrared absorbance ratio D.sub.530 /D.sub.510 of not more than 1.2, namely having a major proportion of .beta.-type crystal structure, at a temperature of at least 40.degree.C but below the melting point of the film while applying to the film a direct current voltage of 200 KV/cm to 1,500 KV/cm. The polyvinylidene fluoride film having a major proportion of .beta.-type crystal structure may be obtained by stretching a fabricated article of polyvinylidene fluoride having a major proportion of .alpha.-type crystal structure under specific conditions.

REFERENCES:
patent: 3197538 (1965-07-01), Capron et al.
patent: 3691264 (1972-09-01), Asahina
patent: 3798473 (1974-03-01), Murayama et al.
Kawai, H., Piezoelectricity of Poly(Vinylidene Fluoride), In Chemical Abstracts, 71:81983, 1969.
Nakamura et al., Piezoelectricity, Pyroelectricity, and The Electrostriction Constant of Poly(Vinylidene Fluoride), In Journal of Polymer Science, Part A-2, 9: pp. 161-173, Jan. 1971.

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