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Method for producing piezoelectric electret functional films with piezoelectric coefficient d31

A technology of piezoelectric electret and piezoelectric coefficient, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., to achieve a simple and feasible process Effect

Inactive Publication Date: 2012-07-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the laboratory-prepared and commercial piezoelectric electret functional films reported so far have only strong stress-strain coefficients. d 33 , and its piezoelectric coefficient d 31 Very small (usually between 1-3pC / N, so usually negligible), much smaller than the piezoelectric coefficient of PVDF d 31 (about 25pC / N)
On the other hand, in many applications (such as bridge structure detection, intelligent monitoring of cable stays, etc.), piezoelectric materials are required to have a strong piezoelectric coefficient d 31 , the existing piezoelectric electret film cannot meet this requirement

Method used

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  • Method for producing piezoelectric electret functional films with piezoelectric coefficient d31
  • Method for producing piezoelectric electret functional films with piezoelectric coefficient d31
  • Method for producing piezoelectric electret functional films with piezoelectric coefficient d31

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 According to the following steps, the piezoelectric coefficient d 31 FEP composite film piezoelectric electret 1 .

[0022] 1. Carve on a 5cm*5cm metal plate such as figure 1 In the groove structure shown, the groove depth is 1mm, the width is 1mm, and the distance between the two grooves is 0.5mm, forming a mold with the groove structure.

[0023] 2. First, put the grooved side of the mold (mould 1) facing up, and cover the surface of mold 1 with a commercially available FEP film with a thickness of 12.5 um, a rubber film with a thickness of 1mm, and A 3mm thick stainless steel plate, and then place them together on the heating plate of the heat press, at a temperature and pressure of 120 o C and 11MPa, pressurize for 1min, and finally remove the stainless steel plate and the rubber film to obtain the FEP film 1 attached to the surface of the mold 1 and having a groove structure.

[0024] 3. Using the method described in step 2 to obtain the FEP film ...

Embodiment 2

[0034] Example 2 According to the following steps, the piezoelectric coefficient d 31 FEP composite film piezoelectric electret 2 .

[0035] 1. Carve on a 5cm*5cm metal plate such as figure 1 In the groove structure shown, the groove depth is 1mm, the width is 0.5mm, and the distance between the two grooves is 0.25mm, forming a mold with the groove structure.

[0036] 2. First, put the grooved side of the mold (mould 3) upward, and cover a commercially available FEP film with a thickness of 12.5 um, a rubber film with a thickness of 1mm, and a 3mm thick stainless steel plate, and then they are placed together on the heating plate of the heat press, at a temperature and pressure of 100 o C and 11 MPa under pressure for 2 minutes, and finally remove the stainless steel plate and the rubber film to obtain the FEP film 3 attached to the surface of the mold 3 and having a groove structure.

[0037] 3. Use the method described in step 2 to obtain the FEP film 4 attached to the s...

Embodiment 3

[0044] Embodiment 3 According to the following steps, the piezoelectric coefficient d 31 FEP composite film piezoelectret3.

[0045] Steps 1 to 6 in Example 1 were repeated.

[0046] 1. Using a pin-plate corona charging system to corona charge the FEP composite film 1 . The distance between the corona needle and the surface of the FEP composite film 1 is 4cm, the corona voltage is -20kV, the charging time is 5min, and the ambient temperature is 15 o c.

[0047] 2. Vacuum vapor-deposit aluminum electrodes with a thickness of 100 nm on both sides of the FEP composite film.

[0048] The FEP composite film piezoelectric electret 3 is obtained through the above steps.

[0049] A 100Hz sinusoidal force signal is used to excite the FEP composite film piezoelectric electret 3 to obtain d 31 is 50 pC / N.

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Abstract

The invention belongs to the technical field of piezoelectric function materials, and particularly relates to a method for producing piezoelectric electret functional films with piezoelectric coefficient d31. The method comprises the steps that non-polar polymer materials form thin polymer films on the surface of a template having grooves through impressing, spray-coating, lifting or spin-coating, the shape of the thin films is the same with that of the template structure, and the thickness of the thin films is between 1mu m and 200mu m; porous structure composite films on which grooves and dense portions are arranged alternately are obtained through hot-pressing bonding of two polymer films having the same structure; and finally the composite films are polarized via a corona charging process or a contact charging process so as to obtain the piezoelectric electret functional films. The piezoelectric electret having grooves obtained through the method has the high piezoelectric coefficient d31 (or d32). The piezoelectric electret functional films can be applied in the fields such as energy collectors, acoustoelectric sensors, robot skins, intelligent structures, opto-acoustic sensors and the like.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric functional materials, in particular to a d 31 The preparation method of the piezoelectric electret functional film. Background technique [0002] Piezoelectrets (also known as ferroelectrets) are a new class of piezoelectric functional materials with artificial microstructures. There is no inherent electric dipole in piezoelectric electret materials, which is different from traditional inorganic piezoelectric materials (piezoelectric single crystals or piezoelectric ceramics, etc.) and organic piezoelectric polymer films (polyvinylidene fluoride or its Copolymers) are important features. Since Finnish scientists discovered the strong piezoelectric effect in polypropylene porous materials around 1990, piezoelectric electret functional materials have attracted extensive attention from the scientific community and the field of sensor technology at home and abroad. Piezoelectric electret has...

Claims

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Application Information

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IPC IPC(8): H01L41/26H01L41/45
Inventor 张晓青游琼娄可行
Owner TONGJI UNIV
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