Self-driven piezoelectric response to regulate surface hydrophilic and hydrophobic fiber membrane and its preparation method

A self-driven, hydrophilic and hydrophobic technology, applied in textiles and papermaking, coatings, non-woven fabrics, etc., can solve problems such as large voltage thresholds

Active Publication Date: 2021-12-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem in the prior art that the applied voltage needs to be used to control the hydrophilicity and hydrophobicity of the polythiophene coating and the voltage threshold for controlling the transition of the hydrophilicity and hydrophobicity is relatively large, and to provide a fiber membrane with a self-driven piezoelectric response to regulate the surface hydrophilicity and hydrophobicity and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for preparing a self-driven piezoelectric response to regulate the hydrophilic and hydrophobic surface of the fiber membrane, the specific steps are as follows:

[0048] (1) Polyvinylidene fluoride and AgNO 3 Dissolve in acetone, then magnetically stir at 23°C for 2h, then heat in a water bath at 60°C for 3h to obtain an electrospinning solution;

[0049] Wherein the mass fraction of polyvinylidene fluoride in the electrospinning solution is 1wt%, AgNO 3 The mass fraction of is 0.3wt%;

[0050] (2) The electrospinning solution is electrospun to obtain an electrospun fiber film, and the electrospun fiber film is vacuum-dried at a temperature of 40°C, a vacuum degree of 99.99%, and a vacuum drying time of 6 hours to obtain PVDF micro-nano Fiber membrane;

[0051] The process parameters of electrospinning are: rotating speed 500r / min, spinning voltage 22.5kV, receiving distance 17cm, solution injection speed 13mL / h, spinning temperature 65℃, relative humidity 6...

Embodiment 2

[0059] A method for preparing a self-driven piezoelectric response to regulate the hydrophilic and hydrophobic surface of the fiber membrane, the specific steps are as follows:

[0060] (1) Polyvinylidene fluoride and FeCl 3 ·6H 2 O was dissolved in deionized water, and then magnetically stirred at 24°C for 1h, then heated in a water bath at 40°C for 5h to obtain an electrospinning solution;

[0061] Wherein the mass fraction of polyvinylidene fluoride in the electrospinning solution is 20wt%, FeCl 3 ·6H 2 The mass fraction of O is 2wt%;

[0062] (2) The electrospinning solution is electrospun to obtain an electrospun fiber film, and the electrospun fiber film is vacuum-dried at a temperature of 60°C, a vacuum degree of 99.99%, and a vacuum drying time of 10 hours to obtain PVDF micro-nano Fiber membrane;

[0063] The process parameters of electrospinning are: rotating speed 300r / min, spinning voltage 13kV, receiving distance 15cm, solution injection speed 3mL / h, spinning...

Embodiment 3

[0071] A method for preparing a self-driven piezoelectric response to regulate the hydrophilic and hydrophobic surface of the fiber membrane, the specific steps are as follows:

[0072] (1) Dissolving polyvinylidene fluoride and nano-graphene in tetrahydrofuran, then magnetically stirring at 25°C for 12h, then heating in a water bath at 50°C for 4h to obtain an electrospinning solution;

[0073] Wherein the massfraction of polyvinylidene fluoride in the electrospinning solution is 3wt%, and the massfraction of nano-graphene is 0.6wt%;

[0074] (2) The electrospinning solution is electrospun to obtain an electrospun fiber film, and the electrospun fiber film is vacuum-dried at a temperature of 45°C, a vacuum degree of 99.99%, and a vacuum drying time of 15 hours to obtain PVDF micro-nano Fiber membrane;

[0075] The process parameters of electrospinning are: rotating speed 200r / min, spinning voltage 10kV, receiving distance 10cm, solution injection speed 0.5mL / h, spinning temp...

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Abstract

The invention relates to a self-driven piezoelectric response regulating surface hydrophilic and hydrophobic fiber membrane and a preparation method thereof. The PVDF base membrane with piezoelectric effect is prepared by electrostatic spinning method, and the polythiophene microsphere coating is sprayed on the base by electrostatic spraying technology. Membrane to obtain a self-driven piezoelectric response to regulate the surface hydrophilic and hydrophobic fiber membrane; the prepared self-driven piezoelectric response to regulate the surface hydrophilic and hydrophobic fiber membrane includes a basement membrane and a polythiophene microsphere coating containing an anionic dopant, the basement membrane For doping AgNO 3 , FeCl 3 ·6H 2 O or nano-graphene PVDF micro-nano fiber membrane, the anion dopant is anhydrous aluminum perchlorate, sodium dodecylbenzenesulfonate or sodium p-benzenesulfonate, polythiophene microspheres coated with anion dopant The porosity of the layer is 80-90%, the peak voltage of the piezoelectric signal of the basement membrane is 0.5-3V, and the threshold value of the surface wettability transition of the self-driven piezoelectric response to regulate the surface of the hydrophilic-hydrophobic fiber membrane is 0.05-0.5V. By applying pressure to the fiber membrane prepared in the present invention, a voltage is generated, so as to realize the wettability transformation of the fiber membrane surface.

Description

technical field [0001] The invention belongs to the technical field of biomaterials, and relates to a self-driven piezoelectric response-regulated surface hydrophilic and hydrophobic fiber membrane and a preparation method thereof. Background technique [0002] The piezoelectric effect refers to a phenomenon in which some dielectrics are polarized inside the material after being deformed by an external force along a certain direction of itself, and the opposite electric charge will be generated on the surface corresponding to this direction. [0003] Polythiophene (Polythiophene) is an intrinsically conductive polymer, which relies on the conjugated bonds of macromolecular bonds to provide conductive carriers to achieve electrical conductivity. in the presence of 0.2M LiClO 4 / CAN electrolyte, when the polythiophene film is doped with a constant potential of 1.2V, in order to balance the charge, the dopant anion ClO 4- was introduced into positively charged polythiophene f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/728D06N3/00
CPCD04H1/728D06N3/0002D06N3/009D06N2203/06D06N2209/142D10B2401/021D10B2401/022
Inventor 王富军卞旻玥曾心怡刘力梦陈旻李超婧王璐
Owner DONGHUA UNIV
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