Piezoelectric polymer materials from epoxy resins and polytetram

Details Piezoelectric polymer materials from epoxy resins and polytetram Piezoelectric polymer materials from epoxy resins and polytetram

1988-06-17

1990-05-01

Kight, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528 94, 528361, 528407, 525504, 20415782, 20415788, 252 629, C08G 5942, C08G 5950, C08G 5956

Patent

active

049219286

ABSTRACT:
A piezoelectric polymer material comprising a cured product of a composition comprised of an epoxy resin having at least two epoxy groups in the molecules, a compound having a molecular weight not less than 1200 and containing defined numbers of amino groups, benzene rings, carbonyl groups and methylene groups, and a crosslinking agent. The cured product has dipolarly oriented micro crystals therein. A method for making such a piezoelectric polymer material is also described, in which the resin composition is thermally cured and contacted with an electric field at a high temperature to cause dipolar orientation in the product. The dipoles are frozen by cooling the product while applying the electric field.

REFERENCES:
patent: 3486925 (1969-12-01), Hoffman
patent: 3577386 (1971-05-01), Maier
patent: 3580887 (1971-05-01), Hubin
patent: 4826616 (1989-05-01), Tanino et al.

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