Electrostatic spinning polyimide uniform small-aperture nanofiber membrane as well as preparation method and application thereof

A nanofiber membrane, polyimide technology, applied in fiber processing, chemical instruments and methods, membrane technology, etc., can solve the problems of no interaction, poor mechanical properties of nanofiber membrane, etc., achieve uniform distribution and simple preparation method The effect of easy, good shape recovery

Active Publication Date: 2022-04-05
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previous electrospun polyimide nanofiber membranes have two disadvantages: first, the average pore size of the polyimide nanofiber membrane prepared by the existing electrospinning process is relatively large, and the average pore diameter exceeds 1 μm; secondly, the previous The electrospun polyimide membrane nanofibers overlap each other without interaction, resulting in poor mechanical properties of the nanofiber membrane

Method used

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  • Electrostatic spinning polyimide uniform small-aperture nanofiber membrane as well as preparation method and application thereof
  • Electrostatic spinning polyimide uniform small-aperture nanofiber membrane as well as preparation method and application thereof
  • Electrostatic spinning polyimide uniform small-aperture nanofiber membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Preparation of Electrospun Polyimide Uniform Small Pore Nanofiber Membrane

[0035] (1) Use a balance to weigh 8.00g of 4,4'-diaminodiphenyl ether into a three-necked flask, and then add 94.76g of N,N-dimethylacetamide. At the same time, the stirring motor was turned on for stirring and nitrogen gas was kept flowing in, so that the reaction system was in a nitrogen atmosphere. After completely dissolving, add 8.72 g of pyromellitic dianhydride in four batches. Stirring is continued at low temperature until a light yellow, uniform and viscous polyamic acid spinning solution precursor is obtained.

[0036] (2) Weigh 8.36g of polystyrene into a blue bottle, add 47.37g of N,N-dimethylacetamide, control the solid content to 15%, and use magnetic stirring to completely dissolve the polystyrene.

[0037] (3) Weigh 10.00 g and 5.00 g of the solutions obtained in step (1) and step (2), respectively, add them into a sample bottle, stir them evenly with a magnet to ob...

Embodiment 2

[0040] Example 2: Preparation of Electrospun Polyimide Uniform Small Pore Nanofiber Membrane

[0041] (1) Use a balance to weigh 8.00g of 4,4'-diaminodiphenyl ether into a three-necked flask, and then add 94.76g of N,N-dimethylacetamide. At the same time, the stirring motor was turned on for stirring and nitrogen gas was kept flowing in, so that the reaction system was in a nitrogen atmosphere. After completely dissolving, add 8.72 g of pyromellitic dianhydride in four batches. Stirring is continued at low temperature until a pale yellow uniform viscous polyamic acid spinning precursor is obtained.

[0042] (2) Weigh 8.36g of polystyrene into a blue bottle, add 47.37g of N,N-dimethylacetamide, control the solid content to 15%, and use magnetic stirring to completely dissolve the polystyrene.

[0043] (3) Weigh 10.00 g and 2.00 g of the solutions obtained in step (1) and step (2), respectively, add them into a sample bottle, stir them evenly with a magnet to obtain a mixed so...

Embodiment 3

[0046] Example 3: Preparation of Electrospun Polyimide Uniform Small Pore Nanofiber Membrane

[0047](1) Use a balance to weigh 8.00g of 4,4'-diaminodiphenyl ether into a three-necked flask, and then add 94.76g of N,N-dimethylacetamide. At the same time, the stirring motor was turned on for stirring and nitrogen gas was kept flowing in, so that the reaction system was in a nitrogen atmosphere. After completely dissolving, add 8.72 g of pyromellitic dianhydride in four batches. Stirring is continued at low temperature until a light yellow, uniform and viscous polyamic acid spinning solution precursor is obtained.

[0048] (2) Weigh 8.36g of polystyrene into a blue bottle, add 47.37g of N,N-dimethylacetamide, control the solid content to 15%, and use magnetic stirring to completely dissolve the polystyrene.

[0049] (3) Weigh 10.00 g and 10.00 g of the solutions obtained in step (1) and step (2), respectively, add them into a sample bottle, stir them evenly with a magnet to ob...

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Abstract

The invention provides an electrostatic spinning polyimide uniform small-aperture nanofiber membrane as well as a preparation method and application thereof, and belongs to the technical field of electrostatic spinning nanofiber membrane materials. The preparation method comprises the following steps: firstly, mixing polyamic acid and polystyrene, carrying out electrostatic spinning, then removing the polystyrene component in the obtained polyamic acid / polystyrene composite nanofiber membrane through heat treatment, and finally obtaining the electrostatic spinning polyimide uniform small-aperture nanofiber membrane. Compared with the conventional electrostatic spinning polyimide nanofiber membrane, the electrostatic spinning polyimide uniform small-aperture nanofiber membrane prepared by the method has the advantages of smaller aperture, more uniform aperture distribution and better mechanical property. The preparation process is simple and easy to operate, and the prepared nanofiber membrane is high in yield, good in comprehensive performance and extremely wide in application range.

Description

technical field [0001] The invention belongs to the technical field of electrospun nanofiber membrane materials, and in particular relates to an electrospun polyimide nanofiber membrane with uniform small aperture and a preparation method and application thereof. Background technique [0002] Polyimide is a special engineering plastic with good molding performance, high mechanical strength, and good thermal stability. It is widely used in various fields of the national economy, such as aerospace, electrical insulation, and environmental industries. [0003] Electrospun nanofiber membrane is a membrane with a three-dimensional porous network structure formed by combining multiple nanofibers. It has the advantages of high porosity, large specific surface area, low density, good air permeability, and simple processing methods. It has broad prospects in various fields such as smart wear, membrane separation, aerospace, petrochemical industry, and automobile industry. The previo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/4382D01D5/00D06C7/00B01D69/08B01D71/64B01D67/00
Inventor 张龙生王阳郭旻皓晁国杰刘天西
Owner JIANGNAN UNIV
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