Method for preparing high-active piezoelectric functional membranes by microwave irradiation

A technology of microwave irradiation and high activity, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problem of difficult process control, high cost, Troublesome problems such as microporous membranes, to achieve the effect of low production cost, easy investment in equipment, and good safety

Inactive Publication Date: 2011-12-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high-pressure gas expansion method requires special high-cost equipment-autoclave, and because various factors (such as temperature, air pressure, gas type, etc.) all affect the modification results of the microporous membrane, so the optimization of the microporous membrane The purpose of the electrical polarization performance and elastic properties is more troublesome, and the process is difficult to control

Method used

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  • Method for preparing high-active piezoelectric functional membranes by microwave irradiation
  • Method for preparing high-active piezoelectric functional membranes by microwave irradiation
  • Method for preparing high-active piezoelectric functional membranes by microwave irradiation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Cut a commercially available polypropylene porous membrane (pp) of model PQ50 into a 3cm×3cm sample as the original membrane soaked in a commercially available reagent grade methylene chloride (CH 2 Cl 2 ) Seal and soak in the solvent container 1 for 20 hours. The original film is composed of the film 3 and the hole 4. After the hole 4 is completely immersed in the solvent, the original film is taken out of the solvent 2 and placed in a petri dish, and placed in the irradiation energy 1.99×10 -25 ~1.99×10 -22 Irradiate under the microwave of J for 50-100s. The temperature of the solvent rises by microwave heating. The solvent in hole 4 is heated to evaporate into gas to achieve the effect of puffing the holes. The irradiated original film is immediately cooled in 0℃ ice water. A piezoelectric functional film with high piezoelectric activity is obtained.

[0026] The volume of the hole 4 of the original film just immersed in the solvent (see figure 1 ) And the volume of hole...

Embodiment 2

[0032] In addition to changing the reagents to reagent grade chloroform (CHCl 3 ) Solvent, except that the immersion time after sealing is 21h, the other processes are the same as in Example 1, that is, a piezoelectric functional film with high piezoelectric activity is obtained.

[0033] By using the same measurement method as in Example 1, the volume change trend of the hole 4 detected by the cross-sectional scanning electron microscope is the same as in Example 1.

[0034] Comparing the thickness of the piezoelectric functional film sample with high piezoelectric activity obtained in the present invention and the original film (unit: μm), it is found that the thickness of the original film is 50 μm, and the thickness of the sample of Example 2 is 66.25 μm (please see Picture 11 ), the thickness of the present invention is 32.5% higher than that of the original film.

[0035] Compare the density of the piezoelectric functional film sample with high piezoelectric activity obtained i...

Embodiment 3

[0038] In addition to replacing the reagents with commercially available reagent grade acetone (CH 3 COCH 3 ) Solvent, other processes are the same as in Example 1, except that the soaking time after sealing is 23h. That is, a piezoelectric functional film with high piezoelectric activity is obtained.

[0039] By using the same measurement method as in Example 1, the volume change trend of the hole 4 detected by the cross-sectional scanning electron microscope is the same as in Example 1.

[0040] Comparing the thickness of the obtained piezoelectric functional film sample with the original film (unit: μm): the thickness of the original film is 50 μm, and the thickness of the sample of Example 3 is 65 μm (see Picture 11 ), the thickness of the present invention is 30% greater than the thickness of the original film.

[0041] Compare the density of the piezoelectric functional film sample with high piezoelectric activity and the original film (unit: g / cm 3 ) It is found that the dens...

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Abstract

The invention discloses a method for preparing high-active piezoelectric functional membranes by microwave irradiation, and relates to a method for preparing high-active piezoelectric functional membranes. The method of the invention comprises the following steps of: soaking polypropylene porous membranes, or COC, PET, FEP, PEN and the like which are available in the market and serve as original membranes into methylenechloride solvent, trichloromethane solvent, acetone solvent, butanone solvent, ethanol solvent and the like which have no response to microwaves for 20 to 30 hours; then takingout from the solvent and irradiating under the microwaves, wherein the irradiation energy is 1.9*10-25-1.99*10-22J, and the irradiation time is 50 to 100 seconds; heating the solvent soaked in membrane pores by using the microwaves to rise the temperature of the solvent and then gasify the solvent in the pores under the action of thermalization so as to achieve the effect of puffing the pores; finally, cooling in ice water at the temperature of 0 zero to obtain the high-active piezoelectric functional membrane which has the pore volume 2 to 3 times that of the original membrane, the thicknessimproved by over 30 percent, and the density reduced by 10 to 20 percent. The method of the invention has the advantages of simple process, low production cost, low-cost and readily available equipment, and high safety; and the obtained high-active piezoelectric electret membranes are suitable to be used as flexible electromechanical conversion materials.

Description

Technical field [0001] A method for preparing a highly active piezoelectric functional film by microwave irradiation relates to a method for manufacturing a highly active piezoelectric functional film, specifically a method for improving the activity of a piezoelectric electret functional film through microwave irradiation, which belongs to flexible piezoelectric functional materials Technical field. technical background [0002] The microporous structure film with non-polar polymer material as the continuous phase has prominent piezoelectric effect and hysteresis loop similar to ferroelectric material after proper electric polarization treatment, and is named as piezoelectric electret or Ferroelectric electret is a new type of electromechanical energy conversion material that has just been developed in the past two decades. It has great application prospects in the fields of sensing, detection, energy harvesting, military and medicine. [0003] According to the theoretical model...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/36C08J9/40C08J7/00C08J7/02C08J3/28H01L41/26H01G7/02H01L41/45
Inventor 张晓青娄可行王学文孙转兰曹功勋夏钟福
Owner TONGJI UNIV
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