Piezoelectric and pyroelectric film

Details Piezoelectric and pyroelectric film Piezoelectric and pyroelectric film

1983-03-14

1985-12-10

Thomas, Alexander S.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264104, 264 9, 15624417, 156380, 156496, 427100, B29D 724

Patent

active

045578800

ABSTRACT:
Film with piezoelectric and pyroelectric properties is obtained by extruding PVDF, stretching the extrudate and applying a corona discharge, preferably at the place where stretching occurs. The PVDF may be homopolymer, but copolymers of at least 50 mole % of vinylidene fluoride with tetrafluoroethylene and/or trifluoroethylene may be used.

REFERENCES:
patent: 3903733 (1975-09-01), Murayama et al.
patent: 3985814 (1976-10-01), Sasaki et al.
patent: 4056742 (1977-11-01), Tibbetts
patent: 4204135 (1980-05-01), Murayama
patent: 4241128 (1980-12-01), Wang
patent: 4340786 (1982-07-01), Tester
patent: 4427609 (1984-01-01), Broussoux et al.
Bloomfield et al, "Piezo- and Pyroelectricity in Poly(Vinylidene Fluoride)", Nav. Res. Rev., vol. 31, #5, May 1978, pp. 1-15.

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