CN102956812B - Application and method for preparing electret piezoelectric material from head-head connected hydrogenation P (VDF-TrFE) - Google Patents

Application and method for preparing electret piezoelectric material from head-head connected hydrogenation P (VDF-TrFE) Download PDF

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CN102956812B
CN102956812B CN201210408794.6A CN201210408794A CN102956812B CN 102956812 B CN102956812 B CN 102956812B CN 201210408794 A CN201210408794 A CN 201210408794A CN 102956812 B CN102956812 B CN 102956812B
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CN102956812A (en
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张志成
夏卫民
徐卓
张秋萍
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Shaanxi Detian Licheng New Material Technology Co.,Ltd.
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Xian Jiaotong University
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Abstract

The invention discloses an application and a method for preparing an electret piezoelectric material from head-head connected hydrogenation P (VDF-TrFE). The hydrogenation P (VDF-TrFE) is prepared into a film, an electric field is heated and polarized, a polymer has an unexpected result, namely, the polymer has the advantages of high voltage coefficient and good electromechanical coupling performance and the like; a dipole moment formed by C-F and C-H bonds in a molecular chain is oriented along an electric field direction so that a chain alignment mode similar to TTTT is formed. The head-head connected hydrogenation P (VDF-TrFE) has the characteristics of safe operation, good stability and low raw material noxious property, and the method can greatly reduce the preparation cost of the P (VDF-TrFE); and the hydrogenation P (VDF-TrFE) is utilized to replace the existing PVDF piezoelectricity film and a direct interpolymer P (VDF-TrFE) so as to be used as the electret piezoelectric material, and the preparation cost of the electret piezoelectric material is greatly reduced.

Description

The hydrogenation P (VDF-TrFE) that head-head connects prepares application and the method for electret piezoelectric
Technical field
The invention belongs to piezo-electric electret technical field, the hydrogenation P (VDF-TrFE) relating to head-head connection prepares application and the method for electret piezoelectric.
Background technology
Electret (electret) is a kind of without under extra electric field condition, can standby storage space electric charge and polarization charge there is the dielectric substance of macroscopical electric moment, it has excellent electroacoustic performance and voltage regulation performance, is mainly used in microphone, earphone, loud speaker, transmitter, accelerometer, various transducer, high voltage source, intensitometer etc.20th century 50 and the sixties, Fukada and some other scholar have found polymer electret material [H.Kawai.Jpn.J.Appl.Phys., 1969,8:975], according to the difference of the polarization mode of electret, electret can be divided into charge-injection type and the large class of spontaneous polarization type two.Compared with charge-injection type electret, spontaneous polarization type electret has clear superiority in stability of material, anti-depolarization performance and ferroelectric piezoelectric performance etc., and most representational spontaneous polarization type polymer electret is Kynoar (PVDF) and vinylidene-trifluoro-ethylene copolymer (P (VDF-TrFE)).
1989, the people such as T.Frukawa carry out studying discovery to the P (VDF-TrFE) that VDF content is 50 ~ 80mol%: the introducing of TrFE can make this copolymer be easy to obtain beta crystal, obtain good ferroelectric, piezoelectricity and pyroelectric property, and have obvious Curie point and ferroelectric-paraelectric phase transition (F-P) phenomenon, and the content of TrFE then directly determines the F-P transition temperature of copolymer.The preparation condition of P (VDF-TrFE) is more simple, gentle, and when TrFE content reaches certain value, the methods such as simple solution coating, melt curtain coating all can obtain the film of high β phase content.But it is noted that above studied P (VDF-TrFE) comes from copolymerization process, the method has the deficiency that monomer is difficult to obtain, synthetic technological condition is harsh and cost is high, is therefore difficult to promote the use of.
Existing vinylidene and chlorotrifluoroethylene (P (VDF-CTFE)) hydrogenation report P (VDF-TrFE) [Wang ZM, Zhang ZC, Mike Chung TC.Macromolecules, 2006 of indirectly preparing in recent years; 39:4268], have employed tri-butyl tin hydride in the method and azodiisobutyronitrile is catalyst, in oxolane, carry out hydrogenation, but the use of hypertoxic organo-tin compound makes the product of gained be difficult to purifying.The method proposing again free radical chain transfer recently carries out hydrogenation, the method adopts N-methyl pyrrolidone to be solvent, the complex that lower valency transition metal halide and corresponding containing n-donor ligand are formed is initator, with easily to hydrogen compound for chain-transferring agent, under chlorine protection, synthesize P (VDF-TrFE) (Chinese invention patent CN 101691412 by a step chain transfer reaction; Tan SB, Liu EQ, Zhang QP, Zhang ZC.Chem.Commun.2011; 47:4544).The method has the low feature of handling safety, good stability and material toxicity, and the method significantly can reduce the preparation cost of P (VDF-TrFE), and making it is applied in more wide field provides opportunity.
The P (VDF-TrFE) that method for hydrogenation obtains is essentially different with the P (VDF-TrFE) of direct copolymerization, is mainly direct copolymer kind VDF (-CF 2-CH 2-) and TrFE(-CF 2-CFH-) between connected mode be head-tail connect (--CF 2cH 2-CF 2-CFH--), and in hydrogenated copolymer be head-head connect (--CF 2cH 2-CFH-CF 2--), the difference of two kinds of connected modes causes its heat, crystallization and dielectric property completely different (Zhang ZC, Meng QJ, Chung TCM.Polymer.2009,50,707.).
Summary of the invention
The problem that the present invention solves is that the hydrogenation P (VDF-TrFE) providing head-head to connect prepares application and the method for electret piezoelectric, this polymer has the advantage such as high tension electricity coefficient, good mechanical-electric coupling performance after heating electric field polarization, can be used widely in the fields such as transducer, memory device and energy conversion device.
The present invention is achieved through the following technical solutions:
VDF and TrFE monomer connected mode is that hydrogenation P (VDF-TrFE) bipolymer of head-head mode is preparing the application in electret piezoelectric.
Hydrogenation P (VDF-TrFE) bipolymer is polarized under the electric field, makes the arrangement of dipole moment along direction of an electric field orientation of C-F and c h bond formation in hydrogenation P (VDF-TrFE) bipolymer strand.
In described hydrogenation P (VDF-TrFE) bipolymer, VDF molar fraction is between 90% ~ 60%.
Polymers element; Described smooth substrate is quartz plate, sheet glass or sheet metal;
Described extrusion by melting prepares hydrogenation P (VDF-TrFE) element that thickness is 0.05 ~ 2.0mm;
Described pressure sintering prepares hydrogenation P (VDF-TrFE) element that thickness is 0.1 ~ 2.0mm.
Described step 2) in, hydrogenation P (VDF-TrFE) bipolymer component thickness is 1 ~ 100 μm; In described step 3), described electrode is the various conductive electrode such as Al, Ag, Cr, Au or Pt.
In described step 3), being polarized in described electric field: at 20 ~ 150 DEG C, with the AC power polarization 1 ~ 24h of 10 ~ 400MV/m, electric current 1 ~ 100mA and frequency 0.1 ~ 100Hz, keeps voltage to be cooled to room temperature.
The dipole moment that in described hydrogenation P (VDF-TrFE) bipolymer strand, C-F and c h bond are formed, along direction of an electric field orientation, forms the chain arrangement mode being similar to TTTT.
Compared with prior art, the present invention has following useful technique effect:
In the hydrogenation P (VDF-TrFE) that the present invention relates to, VDF and TrFE monomer connected mode is head-head mode, be different from the head-tail connected mode (see Fig. 1) of traditional copolymerization P (VDF-TrFE), the arrangement of C-F, C-H of connecting with head-tail is easy to be formed compared with the chain arrangement mode of TTTT, hydrogenation P (VDF-TrFE) is due to its head-head connected mode, the arrangement of its C-F, C-H can affect charge placement, is unfavorable for the chain arrangement mode forming TTTT; How and use as piezoelectric and become unpredictable can the difference of this connected mode also make its piezoelectric property.
And hydrogenation P (VDF-TrFE) is prepared into various sizes element by the present invention, then after heating electric field polarization, this polymer is provided with unexpected result: have the advantage such as high tension electricity coefficient, good mechanical-electric coupling performance, the dipole moment that in strand, C-F and c h bond are formed, along direction of an electric field orientation, forms the chain arrangement mode being similar to TTTT; This shows that hydrogenation P (VDF-TrFE) can be used as electret piezoelectric, replace the P (VDF-TrFE) of existing PVDF piezoelectric film and direct copolymerization, make it to be used widely in the fields such as transducer, memory device and energy conversion device.
The hydrogenation P (VDF-TrFE) connected due to head-head has the low feature of handling safety, good stability and material toxicity, and the method significantly can reduce the preparation cost of P (VDF-TrFE), so utilize hydrogenation P (VDF-TrFE) to replace the P (VDF-TrFE) of existing PVDF piezoelectric element and direct copolymerization as electret piezoelectric, will significantly reduce the preparation cost of electret piezoelectric.
Measure hydrogenation P (VDF-TrFE) electret elements after polarization with electric impedance analyzer, measure its piezoelectric modulus (d 33) and electromechanical coupling coefficient (k t), under the frequency of 1 ~ 1GHz, test impedance (Z) and the phase angle (δ) of piezoelectric, and in computational process, introduce electrical quality factor (tan δ e) and mechanical quality factor (tan δ m), the d of P (VDF-TrFE) the thick film electret obtained 33for-25pC/N, electromechanical coupling coefficient (k t) be 0.26, there is the advantage such as high tension electricity coefficient, good mechanical-electric coupling performance.
Accompanying drawing explanation
Fig. 1 is that hydrogenation P (VDF-TrFE) and direct polymerization P (VDF-TrFE) monomer combination compare;
Fig. 2-1 ~ 2-2 to be VDF molar fraction be 20% hydrogenation P (VDF-TrFE) nuclear-magnetism.Fig. 2-1 is 1h NMR, Fig. 2-2 is 19f NMR;
Fig. 3-1 is the arrangement schematic diagram of direct polymerization P (VDF-TrFE) monomer C-F, C-H before polarization
Fig. 3-2 is arrangement schematic diagrames of hydrogenation P (VDF-TrFE) monomer C-F, C-H;
Fig. 4 is Electrostatic potential situation in hydrogenation P (VDF-TrFE) strand after polarization, and blue (upper part) represents " just ", and yellow (lower part) represents " bearing ";
Fig. 5 is P (VDF-TrFE) electret elements polarization environment schematic;
Fig. 6 is P (VDF-TrFE) electret elements impedance spectrum;
Fig. 7 is P (VDF-TrFE) electret elements electric hysteresis loop.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, and the explanation of the invention is not limited.
The hydrogenation P (VDF-TrFE) that head involved in the present invention-head connects) bipolymer piezoelectric, material synthesis processes is shown in Chinese patent CN 101691412A, and in P (VDF-TrFE), the molar fraction of VDF is adjustable between 50 ~ 80% (Figure 2 shows that VDF molar fraction is the hydrogenation P (VDF-TrFE) of 20%
Described its piezoelectric coefficient d of electret piezoelectric 33higher than-20pC/N, d 31higher than 20pC/N, electromechanical coupling factor is greater than 0.20.
The hydrogenation P (VDF-TrFE) that head-head connects prepares a method for electret piezoelectric, comprises the following steps:
1) hydrogenation P (VDF-TrFE) bipolymer that head-head mode connects is made piezoelectric element;
2) on P (VDF-TrFE) piezoelectric element, prepare electrode, be then placed in electric field and polarize, make C-F and c h bond in hydrogenation P (VDF-TrFE) bipolymer strand form directed arrangement.
In described step 1), hydrogenation P (VDF-TrFE) bipolymer film is prepared as solution casting method, extrusion by melting or pressure sintering;
Described solution casting method is:
By hydrogenation P (VDF-TrFE) the bipolymer organic solvent dissolution of head-head mode, obtain hydrogenation P (VDF-TrFE) solution, at 40 ~ 150 DEG C, with the mode of solution casting hydrogenation P (VDF-TrFE) bipolymer solution level even application in smooth substrate, under vacuum, dry 0.1 ~ 100h makes organic solvent fully volatilize; Then at 150 ~ 300 DEG C of heating 0.1 ~ 50h, make the abundant melting of hydrogenation P (VDF-TrFE) bipolymer, then reduce temperature to 50 ~ 150 DEG C, annealing 1 ~ 120h, obtains hydrogenation P (VDF-TrFE) binary copolymerization construction element;
Described extrusion by melting is:
Hydrogenation P (VDF-TrFE) the bipolymer powder of head-head mode or pellet are joined in casting films extrusion equipment, be heated to more than 100 DEG C, after polymer melting, regulate the center square of two pairs of pressure rollers, extrude hydrogenation P (VDF-TrFE) element obtaining desired thickness;
Described pressure sintering is:
Hydrogenation P (VDF-TrFE) the binary copolymerization raw material of head-head mode is joined in hot pressing die, then together with mold heated to more than 100 DEG C, with hydraulic test, hot pressing die is imposed to the pressure of 1MPa ~ 100MPa, make it hot-forming, obtain hydrogenation P (VDF-TrFE) element.
Described solution casting method prepares hydrogenation P (VDF-TrFE) the binary nuclear-magnetism altogether that thickness is 10 ~ 50 μm.Fig. 2-1 1h NMR, Fig. 2-2 is 19f NMR).
See Fig. 1, Fig. 3-1, Fig. 3-2, be different from the head-tail connected mode of traditional copolymerization P (VDF-TrFE), the arrangement of C-F, C-H of connecting with head-tail is easy to be formed compared with the chain arrangement mode of TTTT, hydrogenation P (VDF-TrFE) is due to its head-head connected mode, the arrangement of its C-F, C-H can affect charge placement, is unfavorable for the chain arrangement mode forming TTTT.
But the present invention hydrogenation P (VDF-TrFE) that head-head is connected) bipolymer makes element, then polarization is rear in the electric field finds, the arrangement of its C-F, C-H forms the chain arrangement mode (see Fig. 4) of similar TTTT, electret piezoelectric can be made, and there is the advantage such as high tension electricity coefficient, good dynamo-electric coupling performance.
The hydrogenation P (VDF-TrFE) that head-head connects prepares the method for electret piezoelectric, is prepared into element, then heats electric field polarization, comprise the following steps:
1) hydrogenation P (VDF-TrFE) bipolymer that head-head mode connects is made the piezoelectric element (requirement according to piezoelectric element is determined) of definite shape;
2) do upper suitable electrodes at P (VDF-TrFE) piezoelectric element of definite shape, be then placed in electric field and polarize, make C-F and c h bond in hydrogenation P (VDF-TrFE) bipolymer strand form directed arrangement.
Concrete, the preparation of the piezoelectric element of definite shape can comprise following 3 kinds of methods:
Method one, solution casting method, step is as follows:
1) by hydrogenation P (VDF-TrFE) bipolymer of head-head mode with organic solvent (such as, dimethyl formamide, acetone, dimethylacetylamide, oxolane, dioxane etc.) dissolve, obtain hydrogenation P (VDF-TrFE) the bipolymer solution of certain mass concentration (such as 5 ~ 10g/mL), at 40 ~ 100 DEG C, with the mode of solution casting hydrogenation P (VDF-TrFE) bipolymer solution level even application on carrier (as glass, smooth quartz plate and sheet metal etc.), under vacuum, dry 0.1 ~ 100h makes organic solvent fully volatilize,
2) hydrogenation P (VDF-TrFE) bipolymer is heated 0.1 ~ 50h at 150 ~ 300 DEG C, make the abundant melting of hydrogenation P (VDF-TrFE) bipolymer, then temperature to 50 ~ 150 DEG C are reduced, annealing 1 ~ 120h, obtains hydrogenation P (VDF-TrFE) the binary copolymerization construction element of certain thickness (such as 10 ~ 50 μm);
3) in hydrogenation P (VDF-TrFE) binary copolymerization construction element, conductive electrode is done, then be placed in electric field and carry out polarize (see Fig. 5), at room temperature to 120 DEG C, with the AC power polarization 0 ~ 24h of electric field 10 ~ 400MV/m, electric current 1 ~ 10mA and frequency 0.1 ~ 100Hz, voltage is kept to be cooled to room temperature; Make the arrangement of dipole moment along direction of an electric field orientation of C-F and c h bond formation in hydrogenation P (VDF-TrFE) bipolymer strand.
Method two, extrusion by melting, concrete steps are as follows:
1) hydrogenation P (VDF-TrFE) the binary copolymerization raw material of head-head mode is directly joined in casting films extrusion equipment, be heated to more than 150 DEG C, thing melting to be polymerized, then regulate the center square of extrusion equipment two pairs of pressure rollers, obtain hydrogenation P (VDF-TrFE) element of thickness certain (such as 0.05 ~ 2.0mm);
2) step 3) in repetition methods one.
Method three, pressure sintering, concrete steps are as follows:
1) hydrogenation P (VDF-TrFE) the binary copolymerization raw material of head-head mode is directly joined in hot pressing die, then more than 180 DEG C are heated to together with grinding tool, with hydraulic test, hot pressing die is imposed to the pressure of 1MPa ~ 100MPa, make it hot-forming, obtain hydrogenation P (VDF-TrFE) element.The thickness of hot pressing sheet can regulate according to the difference adding raw material, is such as 0.1 ~ 2.0mm.
2) step 3) in repetition methods one.
Provide a kind of specific embodiment below.
Embodiment 1
1) the anhydrous conical flask of 100mL capacity is got, in bottle, introduce 20.0mL dimethyl formamide, then add 5.0g P (VDF-TrFE), in 2h, make P (VDF-TrFE) fully dissolve with magnetic stirring apparatus, supplement and add 30.0mL dimethyl formamide, constant volume.Get the DMF of 1.0mL P (VDF-TrFE) with pipette, under 70 DEG C of environment with the mode of solution casting above solution all be coated on the smooth quartz plate that lies in a horizontal plane in vacuum drying oven, quartz plate area is 5cm 2, dry 5h under vacuum, makes DMF fully volatilize.
2) quartz glass plate scribbling P (VDF-TrFE) obtained in step 1 is heated 2h under the environment of 200 DEG C, DMF is volatilized completely, and make P (VDF-TrFE) fully melting, then temperature to 140 DEG C is reduced, keep this temperature environment, make P (VDF-TrFE) thick film annealing 12h, obtain P (VDF-TrFE) thick film that thickness is 20 μm.
3) 20 μm of P (VDF-TrFE) the thick film ion sputtering instruments obtained in step 2 are sputtered the Au electrode that thickness are 100nm.
4) P (VDF-TrFE) thick film electroded in step 3 is placed in the silicone oil of 100 DEG C, keeps temperature, with 2kV voltage, 10mA electric current, frequency is that the triangular wave of 1Hz exchanges (AC) power supply polarization 10min, keeps voltage to be cooled to 25 DEG C.
For the performance of hydrogenation P (VDF-TrFE) film after inspection polarization, the detection that it carries out is comprised: hydrogenation P (VDF-TrFE) the thick film electret after measuring polarization with electric impedance analyzer measures its piezoelectric modulus (d 33) and electromechanical coupling coefficient (k t), under the frequency of 1 ~ 1GHz, test piezoelectric impedance (Z) and phase angle (δ) introduce electrical quality factor (tan δ in computational process e) and mechanical quality factor (tan δ m), measure P (VDF-TrFE) thick film electret electric hysteresis loop by ferroelectric testing equipment.
Concrete, the electric hysteresis loop of P (VDF-TrFE) is tested with German aixACCT TF Analyzer2000 Ferroelectric tester, test electric field is 200MV/m, and P (VDF-TrFE) the thick film electret Z-δ obtained and frequency dependence are as shown in Figure 6;
Test the variation relation of impedance-phase angle with frequency of P (VDF-TrFE) with Agilent-4294A LCR, result as shown in Figure 7 for the P obtained (VDF-TrFE) thick film electret electric hysteresis loop (D-E curve);
With Chinese Academy of Sciences acoustic investigation institute ZJ-4A type quasistatic d 33tester tests the d of thick film electret 33; Tan δ in table 1 eand k tcomposition graphs 7 utilizes formula (1) matching to draw, in formula, G is inverse impedance, C 0for clamp capacitance, l tfor thickness of sample, v dfor the velocity of sound; In table 1, other mechanical performance parameter draws according to concerned countries standard detection.
Above-mentioned calculating electrical quality factor and mechanical quality factor formula used (1) are:
G = j 2 πf C 0 ( 1 - j tan δ e ) πf l t v D πf l t v D - k t 2 ( 1 - j tan δ e ) 2 ( 1 - j tan δ m ) 2 tan ( πf l t v D ) Formula (1)
P (VDF-TrFE) the thick film electret parameter obtained is as shown in table 1.
Table 1P (VDF-TrFE) thick film properties parameter
Performance Unit Parameter Remarks
Mechanical strength MPa 60
Young's modulus GPa 2.3
Density kg/m 3 1890
Acoustic impedance Mray1 4.0
Relative dielectric constant (ε r） - 10 1kHz
Piezoelectric constant (d 33） pC/N ≥-23
Piezoelectric constant (d 31） pC/N ≥20
Quality factor (tan δ e） - 0.018
Electromechanical coupling factor (k t） - ～0.26
Insulation resistance Ω 500M
Working temperature ℃ -40～80
Above-mentioned testing result shows, electret piezoelectric prepared by the hydrogenation P (VDF-TrFE) that head-head connects has the advantage such as high tension electricity coefficient, good mechanical-electric coupling performance.

Claims (5)

1. the hydrogenation P (VDF-TrFE) that head-head connects prepares a method for electret piezoelectric, it is characterized in that, comprises the following steps:
1) hydrogenation P (VDF-TrFE) bipolymer that head-head mode connects is made piezoelectric element;
2) on P (VDF-TrFE) piezoelectric element, prepare electrode, be then placed in electric field and polarize, make C-F and c h bond in hydrogenation P (VDF-TrFE) bipolymer strand form directed arrangement;
Described step 1) in hydrogenation P (VDF-TrFE) binary copolymerization construction element be prepared as solution casting method, extrusion by melting or pressure sintering;
Described solution casting method is:
By hydrogenation P (VDF-TrFE) the bipolymer organic solvent dissolution of head-head mode, obtain hydrogenation P (VDF-TrFE) solution, at 40 ~ 150 DEG C, with the mode of solution casting hydrogenation P (VDF-TrFE) bipolymer solution level even application in smooth substrate, under vacuum, dry 0.1 ~ 100h makes organic solvent fully volatilize; Then at 150 ~ 300 DEG C of heating 0.1 ~ 50h, make the abundant melting of hydrogenation P (VDF-TrFE) bipolymer, then reduce temperature to 50 ~ 150 DEG C, annealing 1 ~ 120h, obtains hydrogenation P (VDF-TrFE) binary copolymerization construction element;
Described extrusion by melting is:
Hydrogenation P (VDF-TrFE) the bipolymer powder of head-head mode or pellet are joined in casting films extrusion equipment, be heated to more than 100 DEG C, after polymer melting, regulate the center square of two pairs of pressure rollers, extrude hydrogenation P (VDF-TrFE) element obtaining desired thickness;
Described pressure sintering is:
Hydrogenation P (VDF-TrFE) the binary copolymerization raw material of head-head mode is joined in hot pressing die, then together with mold heated to more than 100 DEG C, with hydraulic test, hot pressing die is imposed to the pressure of 1MPa ~ 100MPa, make it hot-forming, obtain hydrogenation P (VDF-TrFE) element.
2. the hydrogenation P (VDF-TrFE) that head-head as claimed in claim 1 connects prepares the method for electret piezoelectric, it is characterized in that, described solution casting method prepares hydrogenation P (VDF-TrFE) the binary copolymerization construction element that thickness is 10 ~ 50 μm; Described smooth substrate is quartz plate, sheet glass or sheet metal;
Described extrusion by melting prepares hydrogenation P (VDF-TrFE) element that thickness is 0.05 ~ 2.0mm;
Described pressure sintering prepares hydrogenation P (VDF-TrFE) element that thickness is 0.1 ~ 2.0mm.
3. the hydrogenation P (VDF-TrFE) that head-head as claimed in claim 1 connects prepares the method for electret piezoelectric, it is characterized in that, described step 1) in, hydrogenation P (VDF-TrFE) bipolymer component thickness is 1 ~ 100 μm; Described step 2) in, described electrode is Al, Ag, Cr, Au or Pt conductive electrode.
4. the hydrogenation P (VDF-TrFE) that head-head as claimed in claim 1 connects prepares the method for electret piezoelectric, it is characterized in that, described step 2) in, being polarized in described electric field: at 20 ~ 150 DEG C, with the AC power polarization 1 ~ 24h of 10 ~ 400MV/m, electric current 1 ~ 100mA and frequency 0.1 ~ 100Hz, voltage is kept to be cooled to room temperature.
5. the hydrogenation P (VDF-TrFE) that head-head as claimed in claim 1 connects prepares the method for electret piezoelectric, it is characterized in that, the dipole moment that in hydrogenation P (VDF-TrFE) bipolymer strand, C-F and c h bond are formed, along direction of an electric field orientation, forms the chain arrangement mode being similar to TTTT.
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