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Preparation method of polyvinylidene fluoride nano fiber having piezoelectric/ferroelectric characteristic

A technology with polyvinylidene fluoride and ferroelectric properties, applied in fiber processing, filament/wire forming, single-component halogenated hydrocarbon man-made filament, etc. Device application, etc.

Active Publication Date: 2018-09-04
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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Problems solved by technology

However, the relative content of β-crystals (that is, the proportion of β-crystals in the total crystalline composition of PVDF) of PVDF nanofibers prepared by electrospinning reported so far is not high (<90%)), and contains some α-crystals or γ-crystals. Type, affecting the application of PVDF nanofibers in nano energy storage, sensors, and nano power generation devices

Method used

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  • Preparation method of polyvinylidene fluoride nano fiber having piezoelectric/ferroelectric characteristic
  • Preparation method of polyvinylidene fluoride nano fiber having piezoelectric/ferroelectric characteristic
  • Preparation method of polyvinylidene fluoride nano fiber having piezoelectric/ferroelectric characteristic

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[0027] An embodiment of the present invention provides a method for preparing polyvinylidene fluoride (PVDF) nanofibers with piezoelectric properties, comprising the following steps:

[0028] S1: Dissolve polyvinylidene fluoride in dimethyl sulfoxide (DMSO), heat and keep stirring;

[0029] S2: Cool the solution obtained in step S1, add an auxiliary solvent component and continue to stir, and the auxiliary solvent component is selected from at least one of acetone (AC) and tetrahydrofuran (THF);

[0030] S3: Electrospinning the solution obtained in step S2; and

[0031] S4: heat-treating the spun fibers obtained in step S3.

[0032] The preparation method of the above-mentioned PVDF nanofiber simply dissolves polyvinylidene fluoride step by step in dimethyl sulfoxide and AC and / or THF, and prepares nanofibers through electrospinning, and further heat treatment can obtain PVDF nanofibers with high relative content of β crystals. Choose DMSO to cooperate with AC and / or THF to...

Embodiment 1

[0039] Dissolve 1.383g PVDF powder in 6ml DMSO, stir magnetically at 70°C for 24 hours, cool to room temperature, add 4ml AC, stir magnetically for 24h, and prepare a PVDF solution with a mass concentration of 12.5%. Use the solution to carry out electrospinning, the volume of the used syringe is 10ml, the type of needle is 27G (inner diameter is 0.21mm, outer diameter is 0.41mm), spinning temperature is 25 ℃, humidity is 25%, spinning voltage is 18kV, the spinning capacity is 4ml, the propulsion rate is 0.8ml / h, the receiving distance is 15cm, the drum rotation speed is 2000rpm, and the spinning time is 5h. The prepared nanofibers were heat-treated at 120 °C for 6 h.

Embodiment 2

[0041] Example 2 is basically the same as Example 1, except that the prepared nanofibers are heat-treated at 100° C. for 6 hours.

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Abstract

The invention provides a preparation method of a polyvinylidene fluoride nano fiber having a piezoelectric / ferroelectric characteristic. The preparation method comprises the following steps: S1: dissolving polyvinylidene fluoride into dimethyl sulfoxide, and heating and continuously stirring the mixture; S2: cooling the solution obtained in Step S1, adding an auxiliary solvent component, and continuously stirring the solution, wherein the auxiliary solvent component is selected from at least one of acetone and tetrahydrofuran; S3: performing electrostatic spinning on the solution obtained in Step S2; and S4: performing thermal treatment on a spun fiber obtained in Step S3.

Description

technical field [0001] The invention relates to the field of preparation of polymer materials, in particular to a method for preparing polyvinylidene fluoride nanofibers with piezoelectric / ferroelectric properties. Background technique [0002] Piezoelectric materials are smart materials that generate a voltage when the material deforms. The piezoelectric effect and its inverse piezoelectric effect of piezoelectric materials are widely used in energy conversion and storage, sensors, drivers and other devices. With the development of flexible micro-nano systems, the preparation and application of piezoelectric polymer nanomaterials have attracted much attention due to the advantages of low cost, large area preparation and solution processability of piezoelectric polymer materials. Among piezoelectric polymer materials, polyvinylidene fluoride (PVDF) and its copolymers have excellent piezoelectric, ferroelectric and pyroelectric properties, good mechanical and thermal stabili...

Claims

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Application Information

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IPC IPC(8): D01F6/12D01D5/00
CPCD01D5/0046D01F6/12
Inventor 梁永日
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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