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Beta phase polyvinylidene fluoride composite film and preparation method thereof

A technology of polyvinylidene fluoride and composite film, which is applied in the field of β-phase polyvinylidene fluoride composite film and its preparation, to achieve good temperature stability and increase the effect of content

Inactive Publication Date: 2007-10-03
长春中科应化特种材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after PVDF is dissolved in an organic solvent, only α-phase or γ-phase films can be obtained. Although it has been reported that PVDF dissolved in hexamethylphosphoramide (HMPA) solvent and crystallized at room temperature can obtain β-phase PVDF films, the toxicity of HMPA limits the Application of such methods

Method used

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  • Beta phase polyvinylidene fluoride composite film and preparation method thereof
  • Beta phase polyvinylidene fluoride composite film and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Fe(NO 3 ) 3 9H 2 O and PVDF-HFP with a mass percentage concentration of 95% were dissolved in DMF, and a solution with a mass percentage concentration of 20% was prepared. The solution was stirred, mixed evenly, spin-coated on a glass substrate, and crystallized and evaporated at 60 ° C for 24 hours. A β-phase PVDF film was obtained. The test results are shown in Figure 1.

Embodiment 2

[0019] Concentration by mass percentage is 5% Fe(NO 3 ) 3 9H 2 O and PVDF-HFP with a mass percentage concentration of 95% were dissolved in DMF, and a solution with a mass percentage concentration of 20% was prepared. The solution was stirred, mixed evenly, spin-coated on a glass substrate, and crystallized and evaporated at 60 ° C for 24 hours. A β-phase PVDF film was obtained. The results are reported in Figure 1.

Embodiment 3

[0021] Co(NO 3 ) 2 ·6H 2 O and PVDF-HFP with a mass percentage concentration of 95% were dissolved in DMF to prepare a solution with a mass percentage concentration of 20%. On the substrate, crystallize and evaporate at 60°C for 24 hours to obtain a β-phase PVDF film. The results are reported in Figure 1.

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Abstract

This invention relates to a kind of beta phase polyvinylidene difluoride film laminate and its preparation method. The composition and quality ratio: inorganic hydrated salt 1 to 20 percent, polyvinylidene fluoride 80 to 99 percent; the inorganic hydrated salt is: Fe ( NO3) 3. 9H2O, Ni ( NO3) 2. 6H2O, or Co ( NO3) 2. 6H2O; The polyvinylidene fluoride is: polyvinylidene fluoride homopolymer or polyvinylidene fluoride- hexafluoropropylene copolymer. According to certain quality composition, dissolve polyvinylidene fluoride and inorganic hydrated salt in dimethyl formamide solvent, after misce bene, spincoating on glass or silicon chip, evaporate and crystallize for 24 hours at 20 to 100 deg, obtain polyvinylidene fluoride film laminate. This method avoids using of noxious solvent hexametapol.

Description

technical field [0001] The invention belongs to the field of piezoelectric polymer materials, in particular to a β-phase polyvinylidene fluoride composite film and a preparation method thereof. Background technique [0002] Compared with traditional piezoelectric ceramics, polyvinylidene fluoride (PVDF) piezoelectric materials have the advantages of good flexibility, low acoustic impedance, matching with the human body, and can be made into large-area films. They have been used in aerospace, electronics, medical treatment, etc. industry is widely used. [0003] PVDF has four crystalline phases of α, β, γ, and δ, among which the α phase has no piezoelectric activity, and the β phase has the largest piezoelectric activity. However, the commonly used melt crystallization or solution crystallization can only obtain non-piezoelectrically active α-phase or low-voltage electroactive γ-phase PVDF films, so how to obtain β-phase PVDF films becomes the key to the preparation of PVDF ...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L27/16C08K3/28
Inventor 郇彦刘雅言杨一飞于晓明
Owner 长春中科应化特种材料股份有限公司
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