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Preparation method of functional film of flexible piezoelectric electret

A piezoelectric electret and scalability technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, etc., can solve the problem of lack of scalability and other problems, and achieve the effect of simple and easy process

Inactive Publication Date: 2013-01-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the piezoelectric electret functional films reported so far have stretchable properties.

Method used

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  • Preparation method of functional film of flexible piezoelectric electret
  • Preparation method of functional film of flexible piezoelectric electret
  • Preparation method of functional film of flexible piezoelectric electret

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 According to the following steps, a cross-linked polypropylene piezoelectric electret 1 with stretchable properties can be obtained.

[0028] 1. First, cut the commercially available 1.5mm thick electron beam cross-linked polypropylene porous structure sheet (ie, foam plastic sheet) into a rectangular sample of 8cm*6cm, and then fix it on a unidirectional stretching machine for stretching and tensioning The stretching area is a 6cm*6cm square area, and the stretching temperature is set at 100 o C. Stop the stretching step when the length of the final stretching zone is 8 cm, and cool the sample to room temperature.

[0029] 2. Place the stretched sample on the hot press for hot pressing. Set the temperature of the press to 70 o C, the hot pressing time is set to 10min, and the pressure of the hot pressing machine is 0.7MPa.

[0030] 3. Perform corona polarization treatment on the above processed samples. The distance between the corona electrode and the sample surf...

Embodiment 2

[0033] Example 2 According to the following steps, a cross-linked polypropylene piezoelectric electret 2 with stretchable properties can be obtained.

[0034] 1. First, cut the commercially available 1.5mm thick electron beam cross-linked polypropylene porous structure sheet (ie, foam plastic sheet) into a rectangular sample of 8cm*6cm, and then fix it on a unidirectional stretching machine for stretching and tensioning The stretching area is a 6cm*6cm square area, and the stretching temperature is set at 100 o C. Stop the stretching step when the length of the final stretching zone is 12 cm, and cool the sample to room temperature.

[0035] 2. Place the stretched sample on the hot press for hot pressing. Set the temperature of the press to 80 o C, the hot pressing time is set to 10min, and the pressure of the hot pressing machine is 0.7MPa.

[0036] 3. Perform corona polarization treatment on the above processed samples. The distance between the corona electrode and the sample sur...

Embodiment 3

[0038] Example 3 According to the following steps, a cross-linked polypropylene piezoelectric electret 3 with stretchable properties can be obtained.

[0039] 1. First, cut the commercially available 1.5mm thick electron beam cross-linked polypropylene porous structure sheet (ie foam plastic sheet) into a rectangular sample of 8cm*6cm, and then place the sample on a hot press for hot pressing. Set the temperature of the press to 70 o C, the hot pressing time is set to 5min, and the pressure of the hot pressing machine is 0.7MPa.

[0040] 2. Fix the stretched sample on a uniaxial stretching machine for stretching. The stretched area is a square area of ​​6cm*6cm, and the stretching temperature is set at 100 o C. Stop the stretching step when the length of the final stretching zone is 9 cm, and cool the sample to room temperature.

[0041] 3. Perform corona polarization treatment on the above processed samples. The distance between the corona electrode and the sample surface is 4cm, t...

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Abstract

The invention belongs to the technical field of a piezoelectric functional material, and particularly relates to a preparation method of a functional film of a flexible cross-linked polypropylene piezoelectric electret, which comprises the specific steps of: using a cross-linked polypropylene porous material, adjusting a micro structure and physical properties of a thin film by a hot drawing or / and hot pressing process, polarizing the thin film by a corona charging or contact charging process, thereby obtaining the required functional film of the piezoelectric electret. The prepared piezoelectric electret not only has strong piezoelectric effects but also has flexible characteristics. The functional film of the piezoelectric electret can be applied to such fields as robot skin, artificial muscles, intelligent clothing, intelligent structures, energy collectors and acoustical-electrical sensors.

Description

Technical field [0001] The invention belongs to the technical field of piezoelectric functional materials, and specifically relates to a method for preparing a stretchable cross-linked polypropylene piezoelectric electret functional film. Background technique [0002] Piezoelectrets (also called ferroelectrets) are a new type of artificial microstructure piezoelectric functional materials. The important difference between piezoelectric electret and traditional inorganic piezoelectric materials (piezoelectric single crystal or piezoelectric ceramics, etc.) and organic piezoelectric polymer film (polyvinylidene fluoride or its copolymer) is that the piezoelectric electret There is no intrinsic electric dipole, that is, the matrix material of the piezoelectric electret is a non-polar polymer. The piezoelectric effect of the piezoelectric electret is the product of the ingenious combination of the electret characteristics of the base material and the special microporous mechanical s...

Claims

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Application Information

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IPC IPC(8): H01L41/45
Inventor 张晓青张欣梧游琼
Owner TONGJI UNIV
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