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Polyvinylidene fluoride-hexafluoropropylene magnetic porous piezoelectric composite film as well as preparation method and application thereof

A polyvinylidene fluoride, composite film technology, applied in piezoelectric effect/electrostrictive or magnetostrictive motors, application of piezoelectric device property force measurement, electrical components, etc., can solve the problem of seldom considering flexibility. Good copolymers, loss of nano-fillers, reduction of material flexibility, etc., to achieve the effect of improving piezoelectric output performance, increasing compressibility, and huge application potential

Active Publication Date: 2022-02-25
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the existing non-solvent-induced phase separation technology is used to prepare porous polymer composites filled with nanofillers, the nanofillers may lose a large amount of solvent along with the phase separation process, making it difficult for the nanofillers to effectively distribute into the porous matrix and play a heterogeneous role. At the same time, the introduction of rigid nanofillers may reduce the overall flexibility of the material, which is not conducive to the piezoelectric output performance of porous composite materials as piezoelectric materials.
The matrix material involved in the existing piezoelectric material technology usually adopts the homopolymer polyvinylidene fluoride, and rarely considers the more flexible copolymer polyvinylidene fluoride-hexafluoropropylene
In addition, the existing polyvinylidene fluoride piezoelectric materials only have contact piezoelectric output properties, that is, piezoelectric responses under the stress of contact with the material, and rarely have non-contact piezoelectric output properties.

Method used

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  • Polyvinylidene fluoride-hexafluoropropylene magnetic porous piezoelectric composite film as well as preparation method and application thereof
  • Polyvinylidene fluoride-hexafluoropropylene magnetic porous piezoelectric composite film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) 1mg Fe 3 o 4 Nanoparticles were dispersed in 10mL ethanol / deionized water mixed solution, the volume ratio of ethanol to deionized water was 1:1, under argon protection, 0.5mL KH550 was added to the above mixed solution and stirred in an oil bath at 60°C for 8h , cooled to room temperature, the KH550 modified magnetic particles were washed with deionized water until neutral, and then vacuum-dried at 60°C for 24h to obtain modified Fe 3 o 4 nanoparticles;

[0027] (2) 1g PVDF-HFP matrix is ​​completely dissolved in acetone, and the modified Fe obtained in step (1) 3 o 4 The nanoparticles were ultrasonically dispersed in acetone, and then mixed with the matrix solution, in which Fe 3 o 4 The mass ratio to PVDF-HFP is 0.1:100;

[0028] (3) Add 0.5g PEG-800 additive to the above mixed solution, and then stir the mixed solution vigorously for 2 hours to achieve uniform dispersion of filler particles. After cooling to room temperature, depressurize the obtained sol...

Embodiment 2

[0033] (1) 20mg Fe 3 o 4 Nanoparticles were dispersed in 50mL ethanol / deionized water mixed solution, the volume ratio of ethanol to deionized water was 2:1, under argon protection, 10mL KH550 was added to the above mixed solution and stirred in an oil bath at 80°C for 4h, After cooling to room temperature, the KH550-modified magnetic particles were washed with deionized water until neutral, and then vacuum-dried at 80 °C for 12 h to obtain modified Fe 3 o 4 nanoparticles;

[0034] (2) 2g PVDF-HFP matrix is ​​completely dissolved in acetone, and the modified Fe obtained in step (1) 3 o 4 The nanoparticles were ultrasonically dispersed in acetone, and then mixed with the matrix solution, in which Fe 3 o 4 The mass ratio to PVDF-HFP is 1:100;

[0035] (3) Add 2g of PEG-800 additive to the above mixed solution, and then stir the mixed solution vigorously for 3 hours to achieve uniform dispersion of filler particles. The scraper film is cast on the board, and the height of...

Embodiment 3

[0040] (1) 50mg Fe 3 o 4 Nanoparticles were dispersed in 120mL ethanol / deionized water mixed solution, the volume ratio of ethanol to deionized water was 1.5:1, under argon protection, 20mL KH550 was added to the above mixed solution and stirred in 70°C oil bath for 5h, After cooling to room temperature, the KH550 modified magnetic particles were washed with deionized water to neutrality, and then vacuum-dried at 60°C for 24 hours to obtain modified Fe 3 o 4 nanoparticles;

[0041] (2) 1g PVDF-HFP matrix is ​​completely dissolved in acetone, and the modified Fe obtained in step (1) 3 o 4 The nanoparticles were ultrasonically dispersed in acetone, and then mixed with the matrix solution, in which Fe 3 o 4 The mass ratio to PVDF-HFP is 5:100;

[0042] (3) Add the additive 2g PEG-800 to the above mixed solution, and then stir the mixed solution vigorously for 2 hours to realize the uniform dispersion of filler particles. The scraper film is cast on the board, and the heig...

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Abstract

The invention relates to a polyvinylidene fluoride-hexafluoropropylene magnetic porous piezoelectric composite film as well as a preparation method and application thereof. Raw materials of the polyvinylidene fluoride-hexafluoropropylene magnetic porous piezoelectric composite film comprise polyvinylidene fluoride-hexafluoropropylene and ferroferric oxide nanoparticles, the film is prepared through a non-solvent induced phase separation method, Fe3O4 nanoparticles are modified with a surface modifier to enhance the interfacial interaction between the Fe3O4 nanoparticles and a PVDF-HFP matrix, so that the Fe3O4 nano-particles are effectively and uniformly distributed in a PVDF-HFP porous network structure, and cannot cause a massice loss when polyethylene glycol (PEG) is extracted by water / methanol in the phase separation process. The obtained magnetic porous piezoelectric composite film not only can have piezoelectric signals under a contact type condition, but also can have piezoelectric signals under a non-contact type condition, and the film is good in flexibility and has good application prospects in the fields of energy collectors, pressure sensors, wearable electronic devices and the like.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride-hexafluoropropylene magnetic porous piezoelectric composite film and its preparation method and application, which belong to the field of piezoelectric nanogenerators and wearable electronic devices, and are used in biomechanical energy collection, flexible intelligent sensing materials, etc. The field has broad application prospects. Background technique [0002] At present, the rapid development of the Internet of Things and artificial intelligence has increasingly stimulated the demand for self-powered portable electronic products, especially in the context of fossil fuel energy shortage and serious pollution, sustainable and clean energy has become one of the options for commercial portable devices. A promising alternative energy source. Therefore, smart devices that convert the abundant micromechanical motions in the environment (heat, light, sound, human motion, and magnetic field drive, etc.) i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K9/06C08K9/04C08K3/22C08J9/26C08J5/18G01L1/16H02N2/18
CPCC08J9/26C08J9/009C08J5/18G01L1/16H02N2/18C08J2327/16C08J2201/0462C08J2201/0464
Inventor 陆波李慧慧王杰程涛连王威张文轩董斌斌刘春太
Owner ZHENGZHOU UNIV
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