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A kind of preparation method of polyvinylidene fluoride film electret

A technology of polyvinylidene fluoride and electret, which is applied in the direction of electret, nanotechnology for materials and surface science, and capacitors that change capacitance in a non-mechanical way, which can solve the problem of electret performance. To achieve the ideal effect, no electrostatic effect, low use temperature and other issues, to achieve unique physical properties, improve storage performance, and easy to peel off

Active Publication Date: 2018-06-12
TAIZHOU HAOTIAN IND FABRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This preparation method can obtain thinner electrets. However, polyvinylidene fluoride, as a traditional polymer piezoelectric material, has the advantages of flexibility and good manufacturability, but due to its lower use temperature and smaller pressure The electric coefficient (generally only 17-21pC / N), and it has no electrostatic effect, the sensitivity is too low in the actual use process, resulting in the performance of the electret not reaching the ideal effect

Method used

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  • A kind of preparation method of polyvinylidene fluoride film electret

Examples

Experimental program
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Embodiment 1

[0029] refer to figure 1 , prepare a single-pass porous anodized aluminum nanotemplate with an aluminum metal substrate 1 and a 10 cm × 10 cm thick glass slide. Among them, the surface of the nano-template is densely distributed with concave holes 3 with pore diameter D=50nm, hole spacing L=50nm, and depth d=100nm. The concave holes 3 and the aluminum metal substrate 1 are separated by a petri dish-shaped barrier layer 2, macroscopically The template is a square of 2cm x 2cm. The glass slides are stacked with obstacles around them to give the effect of a petri dish. After cleaning and drying the nano templates, place the surface up in the center of the glass slides for use.

[0030] Weigh 2g of polyvinylidene fluoride into a beaker, and take 24mL of N,N-dimethylformamide (DMF) with a 25mL graduated cylinder for use. Pour DMF into a beaker and mix it with polyvinylidene fluoride, seal the mouth of the beaker with a film, and then put it into an ultrasonic environment to dissol...

Embodiment 2

[0036] refer to figure 1 , the surface of the nano-template is densely distributed with concave hole diameter D=100nm, hole spacing L=100nm, depth d=100nm, the surface micro-nano structure of the formed polyvinylidene fluoride film electret is slightly different from that of Example 1, and the rest The preparation methods are all the same as in Example 1.

Embodiment 3

[0038] refer to figure 1 , the surface of the nano-template is densely distributed with concave hole diameter D=150nm, hole spacing L=100nm, depth d=100nm, the surface micro-nano structure of the formed polyvinylidene fluoride film electret is slightly different from that of Example 1, and the rest The preparation methods are all the same as in Example 1.

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Abstract

The invention relates to a preparation method for a polyvinylidene fluoride thin film electret. The preparation method comprises the steps of (1) cleaning and drying a nano template, then placing the nano template on a glass sheet, wherein plenty of nanoscale concave holes are formed in the surface of the nano template; and putting the template in a surface-up manner; (2) dissolving polyvinylidene fluoride to form a solution; (3) coating the nano template with the polyvinylidene fluoride solution, baking the nano template in an oven, then drying the nano template in the air naturally to form a polyvinylidene fluoride thin film; (4) enabling the polyvinylidene fluoride thin film to be separated from the nano template; and (5) performing corona poling on the polyvinylidene fluoride thin film at a polarization temperature of 70-200 DEG C for 5-10min. The surface of the thin film electret prepared by the invention has the unique micro-nano structure, so that the thin film electret can be separated from the template easily; and in addition, the electret has an electrostatic effect and a piezoelectric effect at the same time.

Description

technical field [0001] The invention relates to a preparation method of a polymer electret, in particular to a technique for forming a polyvinylidene fluoride thin film electret based on surface micro-nano structure modification and having electrostatic and piezoelectric effects. Background technique [0002] Electrets are a class of functional dielectric materials containing oriented dipoles (frozen or ferroelectric) or quasi-permanent space charges (surface or bulk). Electrets have attracted widespread attention because they can generate a long-lasting and stable electrostatic field, and may have physical effects such as electrostatic, piezoelectric, and pyroelectric effects at the same time. In recent years, with the development of microelectromechanical systems (MEMS), more and more electret materials have been incorporated into MEMS devices. [0003] The micro-size of the electret substrate in MEMS devices is reflected in two aspects: one is the thickness of the film (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G7/02B81C99/00B82Y30/00B82Y40/00
CPCB81C99/008B81C99/0085B82Y30/00B82Y40/00H01G7/023
Inventor 陈钢进许海东王振岳
Owner TAIZHOU HAOTIAN IND FABRIC