Piezoelectric polyvinylidene fluoride porous membrane and preparation method thereof

A polyvinylidene fluoride and porous membrane technology is applied in the field of materials to achieve the effects of easy operation, wide selection range and simple industrial preparation

Inactive Publication Date: 2013-08-21
EAST CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of ionic liquids to assist in the preparation of piezoelec

Method used

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  • Piezoelectric polyvinylidene fluoride porous membrane and preparation method thereof
  • Piezoelectric polyvinylidene fluoride porous membrane and preparation method thereof
  • Piezoelectric polyvinylidene fluoride porous membrane and preparation method thereof

Examples

Experimental program
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Embodiment 1-8

[0032] Weigh polyvinylidene fluoride, ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate) and N,N-dimethylformamide according to the ratio in Table 1, and the weighed N,N -Dimethylformamide Dissolve polyvinylidene fluoride at 95°C, then add ionic liquid and shake well to defoam. Pour the above solution on a glass plate and use a glass plate to scrape out a liquid film of about 200um, then immerse it in a water bath at 0 and 80°C for 20 minutes to obtain a polyvinylidene fluoride film, and then immerse it in deionized water and alcohol for 24 hours to remove the ionic liquid to obtain Piezoelectric polyvinylidene fluoride porous membrane.

[0033] Among them, in Examples 4 and 8, the performance of the porous membrane is further improved by adding inorganic fillers, which include carbon nanotubes, silicon dioxide and graphene; the added quality of the inorganic fillers is 10% of polyvinylidene fluoride.

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Abstract

The invention discloses a piezoelectric polyvinylidene fluoride porous membrane and a preparation method thereof. The piezoelectric polyvinylidene fluoride porous membrane is characterized by being prepared by dissolving polyvinylidene fluoride into a mixed solution of N,N-dimethyl formamide and an ionic liquid by using an immersion-precipitation method, wherein the w/v concentration of the polyvinylidene fluoride in the mixed solution is 10-20%, the volume ratio of the N,N-dimethyl formamide in the mixed solution is 60-95%, and the volume ratio of the ionic liquid is 5-40%. The piezoelectric polyvinylidene fluoride porous membrane provided by the invention has excellent water flux and meets the requirement for the performance of an industrial separation membrane; and meanwhile, the prepared polyvinylidene fluoride porous membrane is a beta crystal with a piezoelectric effect and can vibrate under a low alternating electric field, so that the antipollution capability of the separation membrane can be further improved, and the separation efficiency of the membrane can be further increased.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a piezoelectric polyvinylidene fluoride porous film assisted by ionic liquid and a method thereof. Background technique [0002] There are three main crystal forms of polyvinylidene fluoride, namely α, β and γ. Alpha crystals are non-polar, while beta and gamma crystals are polar. Among them, β crystals have attracted extensive attention due to their excellent piezoelectricity. Polyvinylidene fluoride porous membranes prepared by immersion precipitation usually form α crystals, and rarely obtain β crystals with piezoelectric effect. The non-polar phase α crystals in the polyvinylidene fluoride porous membrane can be transformed into β crystals with piezoelectric effect through electric polarization (see non-patent literature: Piezoelectric membranes for separation processes: fabrication and piezoelectric properties, J. Membr. Sci. 434 (2013) 184-192). The piezoe...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D67/00
Inventor 那兵
Owner EAST CHINA UNIV OF TECH
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