Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1980-10-24
1982-09-14
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264 22, 264235, 26433114, B29C 2500
Patent
active
043495028
ABSTRACT:
Fabrication of unoriented phase I crystalline PVF.sub.2 is described wherein commercially available PVF.sub.2 phase II (crystalline form) is placed in a high pressure cell and its temperature is raised slightly over its melting point. The sample is then subjected to abrupt changes in high pressure and the temperature is dropped thereafter. The pressure is then reduced resulting in a product which contains both phase I and phase II forms of PVF.sub.2. The phase I content of the product varies from a few percent and up depending upon the pressure applied during the quenching step.
REFERENCES:
patent: 2854699 (1958-10-01), Robb
patent: 3691264 (1972-09-01), Asahina
patent: 4241128 (1980-12-01), Wang
"Ferroelectricity in Polyvinylidine Fluoride", R. G. Kepler et al., J. Ap Phys. 49(3), pp. 1232-1235, Mar. 1978.
"Nuclear Magnetic Resonance & X-ray Determination of the Structure of Poly(Vinylidene Fluoride)", J. B. Lando, J. Polymer Sci., vol. 4, part A-1, pp. 941-951 (1966).
"Piezoelectricity, Pyroelectricity, and the Electrostriction Constant of Poly(Vinylidene Fluoride)", K. Nakumura, J. Polymer Sci., Part A-2, vol. 9, pp. 161-173 (1971).
Newman Brian A.
Pae Kook D.
Scheinbeim Jerry I.
Lall P. C.
Pavelko Thomas P.
Sciascia R. S.
The United States of America as represented by the Secretary of
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