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Method for preparing polyimide micron fibers by electrospinning

A polyimide, micro-fiber technology, applied in fiber processing, fiber chemical characteristics, textiles and papermaking, etc., can solve problems such as difficulties, and achieve the effect of environmental protection, life and health, and high modulus.

Active Publication Date: 2019-04-05
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diameter of ultrafine microfibers is 1-5 microns, and it will be very difficult to prepare such ultrafine polyimide microfibers using electrospinning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] (2) Preparation of polyamic acid salt (PAAS): slowly add a certain amount of triethylamine dropwise to the PAA solution (the amount of the substance is 1.5 times that of -COOH in the solution), and mechanically stir for 5 hours at -5°C, Preparation of polyamic acid salts (PAAS). The viscosity measured by Ubbelohde's viscometer is 2.3dL g -1 .

[0042] Among the present invention, polyamic acid ammonium salt dissolves and forms the solution with high concentration in water, and polyamic acid ammonium salt solution is semi-gel state, then dilutes the high polyamic acid ammonium salt solution with alcohol, further reduces viscosity, but Keep relatively high concentration simultaneously, can promote electrospinning like this and be the quick volatilization of solvent in jet, jet solidifies rapidly, forms the thick polyamic acid ammonium salt fiber that diameter is 1-5 micron; Described alcohol is dehydrated alcohol, as In a preferred embodiment of the present invention, t...

Embodiment 1

[0051] The polyamic acid ammonium salt that takes 30g is dissolved in deionized water and stirs, and the mass concentration that obtains polyamic acid ammonium salt is the polyamic acid ammonium salt solution of 45wt%; To polyamic acid ammonium salt solution, add methanol and dilute, stir , the mass concentration that obtains polyamic acid ammonium salt is the polyamic acid ammonium salt spinning stock solution of 15wt%; When polyamic acid ammonium salt spinning stock solution is prepared polyamic acid ammonium salt fiber by electrospinning, voltage, collecting distance and The flow rates are 13kV, 20cm and 0.002mm / s respectively; the polyamic acid ammonium salt fibers are collected with a steel mesh (90 mesh) as a support, placed in a vacuum oven, baked at 70°C for 6h, and then thermal sub After amination treatment, polyimide micron fibers can be obtained. The polyimide micron fiber has a diameter of 1-2 microns, a breaking strength of 3.55GPa, a modulus of 150.3GPa, and a br...

Embodiment 2

[0053] The polyamic acid ammonium salt that takes 30g is dissolved in deionized water and stirs, and the mass concentration that obtains polyamic acid ammonium salt is the polyamic acid ammonium salt solution of 45wt%; To polyamic acid ammonium salt solution, add methanol and dilute, stir , the polyamic acid ammonium salt spinning stock solution that the mass concentration that obtains polyamic acid ammonium salt is 10wt%; When polyamic acid ammonium salt spinning stock solution is prepared polyamic acid ammonium salt fiber by electrospinning, voltage, collecting distance and The flow rates are 13kV, 20cm and 0.002mm / s respectively; the polyamic acid ammonium salt fibers are collected with a steel mesh (90 mesh) as a support, placed in a vacuum oven, baked at 70°C for 6h, and then thermal sub After amination treatment, polyimide micron fibers can be obtained. The polyimide micron fiber has a diameter of 2.5-3 microns, a breaking strength of 3.7GPa, a modulus of 165.5GPa, and a...

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Abstract

The invention relates to the preparation of a polymer electrospinning fiber, more specifically, the invention relates to a method for preparing polyimide micron fibers by electrospinning, which belongs to the technical field of polymer materials. The method for preparing polyimide micron fibers by electrospinning comprises the following steps: dissolving polyamic acid ammonium salt in water to obtain polyamic acid ammonium salt solution; mixing alcohol with polyamic acid ammonium salt solution to obtain polyamic acid ammonium salt The ammonium salt spinning stock solution; the polyamic acid ammonium salt spinning stock solution is spun to obtain polyamic acid ammonium salt fiber; the polyamic acid ammonium salt fiber is thermally imidized to obtain polyimide micron fiber. The polyimide microfibers have a diameter of 1‑5 microns and are characterized by high strength and high modulus.

Description

technical field [0001] The invention relates to the preparation of polymer electrospinning nanofibers, more specifically, the invention relates to a method for preparing polyimide microfibers by electrospinning, which belongs to the technical field of polymer materials. Background technique [0002] There are a large number of nitrogen-containing five-membered heterocyclic rings, benzene rings, ether bonds, carbonyl bonds and amide bonds in the main chain of polyimide macromolecules. Among them, the amide bond is particularly important, and the carbon and oxygen in the aromatic ring are connected by double bonds and The conjugation effect of aromatic heterocycles effectively enhances the binding energy. When radiation is most used in polyimide fibers, the radiation absorbed by molecules is far from enough to open the covalent bonds between atoms in the molecular chain. The existence of this molecular structure makes polyimide fiber resistant to high radiation, high temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/74D01D5/00
CPCD01D5/0069D01D5/0092D01F6/74
Inventor 侯豪情徐海波李永红
Owner JIANGXI NORMAL UNIV
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