Production of piezoelectric PVDF films

Details Production of piezoelectric PVDF films Production of piezoelectric PVDF films

1979-03-20

1980-12-23

Lowe, James B.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

264 22, 428421, 428910, 526255, B29C 2500, H01L 4122

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active

042411289

ABSTRACT:
A method of producing piezoelectric and pyroelectric polyvinylidene fluoride (PVDF) films is shown. A stretched PVDF film having a predominantly .beta.-type crystal structure is rolled for thickness reduction. The rolling orients a substantial percentage of b axes of .beta. crystals normal to the film surface, as determined by X-ray diffraction patterns. An optional annealing step is shown, wherein the rolled film is heated, optionally while under pressure. Improvement in the piezoelectric constant of 25 percent or more is typical.

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patent: 3878274 (1975-04-01), Murayama
patent: 3931446 (1976-01-01), Murayama
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"Piezoelectricity and Pyroelectricity in Crystalline Polymer", G. T. Davis et al., National Bureau of Standards Internal Report, 76-1186 (1976).
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"Piezoelectricity, Pyroelectricity, and The Electrostriction Constant of Poly (Vinylidene Fluoride)", K. Nakumura et al., J. Polymer Sci., Part A-2, vol. 9, pp. 161-173 (1971).
"Electric-Field-Induced Phase Changer in Poly(Vinylidene Fluoride)", G. T. Davis et al., J. Appl. Phys., 49(10), pp. 4998-5002 (1978).
"Nuclear Magnetic Resonance & X-ray Determination of the Structure of Poly(Vinylidene Fluoride)", J. B. Lando et al., J. Polymer Sci., Part A-1, vol. 4, pp. 941-951 (1966).
"Ferroelectricity in Polyvinylidene Fluoride", R. G. Kepler et al., S. Apply. Phys. 49(3), pp. 1232-1235 (1978).

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