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US 6,787,238 B2Granted
Terpolymer systems for electromechanical and dielectric applications
AssigneeThe Penn State Research Foundation
InventorsQiming Zhang, Zhongyang Cheng, Haisheng Xu
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Abstract
There are disclosed new polymer materials having improved electric field induced strain levels, dielectric constants, and elastic energy densities for use in electromechanical and dielectric applications. Methods of manufacture of new polymer materials are also disclosed.
Claims5
A polymer prepared by a polymerizing a mixture of three different monomers comprising:
- (a) at least one monomer of vinylidene-fluoride;
- (b) at least one monomer selected from the group consisting of trifluoroethylene and tetrafluoroethylene;
- and
- (c) at least one monomer selected from the group consisting of tetrafluoroethylene;
- vinyl fluoride;
- perfluoro (methyl vinyl ether);
- bromotrifluoroethylene;
- chlorofluoroethylene;
- chlorotrifluoroethylene;
- and hexafluoropropylene;
- wherein when said polymer is stretched to greater than its original length and thereafter annealed at a temperature below its melting point, it exhibits (1) an electrostrictive strain, at room temperature, of 3% or more when an electric field gradient of 100 megavolts per meter or greater is applied thereacross optionally;
- (2) a dielectric constant, at room temperature, of 40 or higher at 1 kHz;
- and (3) an elastic energy density, at room temperature, of 0.3 joules/cm3 or higher.
10 more elements
A polymer prepared by a polymerizing a mixture of three different monomers comprising:
- (a) at least one monomer of vinylidene-fluoride;
- (b) at least one monomer selected from the group consisting of trifluoroethylene and tetrafluoroethylene;
- and
- (c) at least one monomer selected from the group consisting of tetrafluoroethylene;
- vinyl fluoride;
- perfluoro (methyl vinyl ether);
- bromotrifluoroethylene;
- chlorofluoroethylene;
- chlorotrifluoroethylene;
- and hexafluoropropylene;
- wherein said polymer is stretched to greater than its original length and thereafter annealed at a temperature below its melting point such that it exhibits (1) an electrostrictive strain, at room temperature, of 3% or more when an electric field gradient of 100 megavolts per meter or greater is applied thereacross;
- (2) a dielectric constant, at room temperature, of 40 or higher at 1 kHz;
- (3) an elastic energy density, at room temperature, of 3 joules/cm3 or higher;
- or (4) any combinations thereof.
11 more elements
Dependencies are inferred from the claim text.