Hybrid Electret
This invention discloses a hybrid electret. The hybrid electret comprises at least a first dielectric layer and at least a second dielectric layer, and the first dielectric layer and the second layer are alternatively stacked. The first dielectric layer comprises at least a polymer and the second dielectric layer comprises at least a polymer, and the polymer of the first dielectric layer differs from the polymer of the second dielectric layer.
1 . A hybrid electret comprising at least a first dielectric layer and at least a second dielectric layer, wherein
the first dielectric layer and the second dielectric layer are alternatively stacked;
the first dielectric layer comprises at least a polymer and the second dielectric layer comprising at least a polymer; and
the polymer of the first dielectric layer differs from the polymer of the second dielectric layer.
2 . The hybrid electret of claim 1 , wherein the polymer of the first dielectric layer is not compatible with the polymer of the second dielectric layer.
3 . The hybrid electret of claim 1 , wherein the first dielectric layer and the second dielectric layer are made of materials selected from the group consisting of a crystalline polymer and an amorphous polymer.
4 . The hybrid electret of claim 1 , wherein the polymer of the first dielectric layer is an amorphous polymer and the polymer of the second dielectric layer is a crystalline polymer.
5 . The hybrid electret of claim 1 , wherein the polymer of the first dielectric layer is a polymer blend of an amorphous polymer and a crystalline polymer, and the polymer of the second dielectric layer comprises the crystalline polymer or the amorphous polymer of the polymer blend.
6 . The hybrid electret of claim 1 , wherein the first dielectric layer and the second dielectric layer comprises polymer blends of an amorphous polymer and a crystalline polymer, and wherein the polymer blends of the first dielectric layer and the second dielectric layer have different volume ratio of amorphous polymer and crystalline polymer.
7 . The hybrid electret of claim 3 , wherein the crystalline polymer is selected from the group consisting of polyolefin, nylon and polyester.
8 . The hybrid electret of claim 3 , wherein the amorphous polymer is selected from the group consisting of cyclic olefin copolymer, cycloalkyl olefin copolymer, aromatic olefin copolymer, and polycarbonate.
9 . The hybrid electret of claim 1 , wherein the polymer of the first dielectric layer is selected from the group consisting of a first crystalline polymer and a first amorphous polymer, and the polymer of the second dielectric layer is selected from the group consisting of a second crystalline polymer and a second amorphous polymer.
10 . The hybrid electret of claim 3 , wherein the first dielectric layer or the second dielectric layer further blends with an organic filler or an inorganic filler.
11 . The hybrid electret of claim 1 , wherein the polymer of the first dielectric layer or the second dielectric layer is a copolymer.
12 . The hybrid electret of claim 1 , further comprises a porous structure.
13 . The hybrid electret of claim 1 , wherein the polymer of the first dielectric layer has a first elastic modulus and the polymer of the second dielectric layer has a second elastic modulus, and wherein the ratio value of the first elastic modulus to the second elastic modulus is from 1 to 6.
14 . The hybrid electret of claim 3 , wherein the crystalline polymer has a first elastic modulus and the amorphous polymer has a second elastic modulus, and wherein the ratio value of the first elastic modulus to the second elastic modulus is from 1 to 6.
15 . The hybrid electret of claim 10 , wherein the ratio value of the modulus elasticity of the organic or inorganic filler to that of the crystalline or amorphous polymer ranges from 50 to 600.
16 . The hybrid electret of claim 1 , wherein the first dielectric layer and the second dielectric layer each has a thickness ranges from 10 nm to 500 nm.
17 . The hybrid electret of claim 1 , wherein the first dielectric layer and the second dielectric layer each has a thickness ranges from 10 nm to 200 nm.