Piezoelectric composite material based on β-phase polyvinylidene fluoride and its preparation method

A piezoelectric composite material, polyvinylidene fluoride technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problem of conductivity affecting polymerization Polarization process, unfavorable standardized production and application, low polyvinylidene fluoride β-phase content, etc., to achieve the effect of simple and convenient preparation method and process, simple and easy-to-operate equipment, and easy-to-obtain raw materials

Active Publication Date: 2021-01-26
SUZHOU UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The polyvinylidene fluoride polymer β-phase can be induced to a certain extent by adding the above-mentioned fillers in polyvinylidene fluoride, but the β-phase content of polyvinylidene fluoride prepared by these methods is low, which is not conducive to standardized production and application
In addition, some fillers are conductive materials, such as carbon nanotubes, graphene, etc. The composite materials produced will have obvious leakage current phenomenon, and the increase in the conductivity of the composite materials will affect the polarization process of the polymer. These shortcomings will affect its widely used

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Piezoelectric composite material based on β-phase polyvinylidene fluoride and its preparation method
  • Piezoelectric composite material based on β-phase polyvinylidene fluoride and its preparation method
  • Piezoelectric composite material based on β-phase polyvinylidene fluoride and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a kind of preparation dabcoHReO 4 salt method. Specifically include the following steps:

[0043] 1) Dissolve 1,4-diazabicyclo[2.2.2]octane (dabco) in ultrapure water at room temperature, and the mass ratio of dabco to ultrapure water is 20:100.

[0044] 2) After complete dissolution, press 1,4-diazabicyclo[2.2.2]octane (dabco) and perrhenic acid (HReO 4 ) molar ratio is 1:1, add perrhenic acid (HReO 4 ) aqueous solution. After acid-base neutralization reaction, dabcoHReO is obtained 4 Salt.

[0045] 3) dabcoHReO at room temperature 4 The salt was dissolved in water again, and after the dissolution was complete, the dabcoHReO 4 Put the saline solution into an ultra-low temperature refrigerator and freeze until it becomes completely solid, take it out, and use a freeze dryer to remove the solid water to obtain dabcoHReO 4 salt solids.

Embodiment 2

[0047] For comparison, this example provides a method for preparing a polyvinylidene fluoride film. Specifically include the following steps:

[0048] 1) Dissolve an appropriate amount of PVDF powder in a mixed solution of DMF / AC (volume ratio = 1:1), heat ultrasonically in an ultrasonic instrument at 50°C for 3 hours to promote the complete dissolution of PVDF powder, and let it stand at room temperature for more than 24 hours. Ensure that the sample is completely dissolved, and prepare a PVDF solution with a mass concentration of 10 wt%.

[0049] 2) Evaporate and crystallize the prepared solution in an oven at 70°C. After the solvent is completely volatilized, a film with uniform thickness is prepared. After 5 hours of heat treatment, the oven is closed, and the PVDF film is obtained after natural cooling to room temperature.

Embodiment 3

[0051] This example provides a method for preparing a high-content β-phase polyvinylidene fluoride composite material, specifically dabcoHReO prepared in Example 1 4 Salt is mixed with PVDF according to a certain mass ratio, and PVDF / dabcoHReO is prepared 4 Composite film. The method effectively increases the polyvinylidene fluoride β-phase content. Specifically include the following steps:

[0052] 1) Dissolve an appropriate amount of PVDF powder in a mixed solution of DMF / AC (volume ratio = 1:1), and heat ultrasonically in an ultrasonic instrument at 50°C for 3 hours to promote complete dissolution of the PVDF powder. Let stand at room temperature for 8 hours.

[0053] 2) will dabcoHReO 4 Mix salt and PVDF according to the mass ratio of 2:98, heat ultrasonically in a 50°C ultrasonic instrument for 3 hours, and let it stand at room temperature for more than 24 hours to ensure that the sample is completely dissolved to obtain a mixed solution. In the mixed solution, dabcoH...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention relates to a piezoelectric composite material based on β-phase polyvinylidene fluoride, including β-phase polyvinylidene fluoride and molecular ferroelectrics with multiple polar axes, and the β-phase polyvinylidene fluoride accounts for 85% of the mass fraction of the piezoelectric composite material %‑96%. The present invention also provides its preparation method: mix and dissolve PVDF and molecular ferroelectrics with multiple polar axes in an organic solvent to obtain a mixed solution, wherein the mass ratio of polyvinylidene fluoride to molecular ferroelectrics is 99:1-4:1; the sum of the mass of polyvinylidene fluoride and molecular ferroelectric accounts for 1%-15% of the mass fraction of the mixed solution; the mixed solution is evaporated and crystallized to obtain a polyvinylidene fluoride based on β phase piezoelectric composites. In the piezoelectric composite material of the invention, the content of β-phase polyvinylidene fluoride is relatively high, the performance is stable, and the piezoelectricity is good, and the preparation method is simple and easy to operate.

Description

technical field [0001] The invention relates to the technical field of piezoelectric material manufacturing, in particular to a piezoelectric composite material based on β-phase polyvinylidene fluoride and a preparation method thereof. Background technique [0002] Piezoelectric materials are a class of dielectrics with piezoelectric properties. Utilizing the piezoelectricity of piezoelectric materials, the conversion between mechanical energy and electrical energy can be realized. Piezoelectric materials can sense various mechanical motions and convert motion signals into electrical signals, etc., so as to realize energy collection and detection. Piezoelectric materials are used in every corner of our daily life, such as piezoelectric sensors, piezoelectric resonators, piezoelectric igniters, etc. Piezoelectric materials are not only widely used in daily life, but also have a large number of military applications, such as military radar and military navigation equipment. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08K5/3462C08K5/55C08J5/18H01L41/193H01L41/45
CPCC08J5/18C08K5/3462C08K5/55C08J2327/16H10N30/857H10N30/098
Inventor 胡志军李青青
Owner SUZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap