Piezoelectric compositions

Patent metadata

Field	Value
Publication number	US-9484524-B2
Application number	US-201414146325-A
Country	US
Kind code	B2
Filing date	Jan 2, 2014
Priority date	Aug 9, 2006
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

Piezoelectric compositions are provided wherein mechanical and piezoelectric properties can be separately modulated. Preferred compositions include resin blends that comprise: (a) a piezoelectrically active polymer and (b) a matrix polymer, methods of making, and use of such resin blends. Advantages of preferred resin blends of the invention can include high piezoelectricity, mechanical strength and flexibility, convenient fabrication process, and high sensitivity at high temperatures.

First claim

What is claimed:

1. A piezoelectric resin blend comprising:
(a) a piezoelectrically active polymer that is a polymer or copolymer selected from poly(γ-benzyl α,L-glutamates) (PBLG), vinyl PBLG, polystyrene, polypropylene, low density polypropylene, polyvinylidene fluoride (PVDF), poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)], poly(oxymethylene), nylon 6, nylon 66, nylon 610, epoxies, polyurethanes, cellulose, foam fluorinated ethylene propylene copolymer (FEP), glass beaded fluorinated ethylene propylene copolymer (FEP), porous polytetrafluoroethylene (PTFE), glass resins, or mixtures thereof;
and

(b) monomers for the formation of a matrix polymer that is poly(methylmethacrylate) (PMMA), polyethylene, polyvinylchloride, poly(l-butene), or a silicone elastomer; and

wherein the piezoelectric polymer comprises from about 5% to about 50% (w/w) of the resin blend.

2. The piezoelectric resin blend of claim 1 wherein the piezoelectrically active polymer is poly(γ-benzyl α,L-glutamate) (PBLG).

3. The piezoelectric resin blend of claim 1 wherein the piezoelectrically active polymer is a polymer or copolymer selected from low density polypropylene, foam copolymer FEP, glass beaded copolymer FEP, porous PTFE, glass resins, and mixture thereof.

4. The piezoelectric resin blend of claim 1 wherein the piezoelectrically active polymer consists of repeat units ranging from about 20 to about 3500.

5. The piezoelectric resin blend of claim 1 wherein the piezoelectrically active polymer is a cross-linked polymer.

6. The piezoelectric resin blend of claim 1 wherein the matrix polymer is a silicone elastomer.

7. The piezoelectric resin blend of claim 1 wherein the blend is thermally stable.

8. A piezoelectric resin blend, comprising
(a) a piezoelectrically active polymer that comprises poly(γ-benzyl α,L-glutamates) (PBLG); and
(b) monomers for the formation of a matrix polymer that is poly(methylmethacrylate) (PMMA); and

wherein said piezoelectrically active polymer is oriented along a poling direction.

Assignees

• Univ Johns Hopkins

Inventors

• Yu Michael
• West James E
• Busch-Vishniac Ilene J
• Farrar Dawnielle

Classifications

• H01L41/193

  Electricity · mapped topic

• H01L41/183 Primary

  Electricity · mapped topic

• H10N30/852 Primary

  Composite materials, e.g. having 1-3 or 2-2 type connectivity · CPC title

• H10N30/857

  Macromolecular compositions · CPC title