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Method for preparing polyacrylonitrile nano-fiber by electrolyte solution circulation high-pressure electrostatic spinning

A high-voltage electrospinning, electrolyte solution technology, applied in fiber processing, rayon manufacturing, fiber chemical characteristics, etc., can solve the problems of poor quality of polymer nanofibers, easy clogging of spinning heads, etc. The effect of small diameter and simple preparation process

Inactive Publication Date: 2012-07-11
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention discloses a method for preparing polyacrylonitrile nanofibers by high-voltage electrospinning with electrolyte solution circulation, which can overcome the existing problems in the prior art that the spinning head is easily blocked, the spinning process is interrupted, and the quality of the produced polymer nanofibers is poor. disadvantages

Method used

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  • Method for preparing polyacrylonitrile nano-fiber by electrolyte solution circulation high-pressure electrostatic spinning
  • Method for preparing polyacrylonitrile nano-fiber by electrolyte solution circulation high-pressure electrostatic spinning
  • Method for preparing polyacrylonitrile nano-fiber by electrolyte solution circulation high-pressure electrostatic spinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Single spinning of 14% polyacrylonitrile (PAN)

[0023] A flattened stainless steel injection needle (inner diameter 0.3 mm) was used as the capillary for jetting fine flow, connected to a high-voltage generator (ZGF2000, Shanghai Sute Electric Co., Ltd.), and the flow of spinning solution was controlled by a micro-injection pump (USA). company) control, the fiber receiving plate 4 adopts the aluminum foil plate to receive nanofibers.

[0024] Disperse 14.0g of PAN powder in 100ml of N,N-dimethylacetamide (DMAc) at room temperature, then shake overnight in a constant temperature shaker at 50°C to prepare a yellow translucent spinning solution, which is released in the atmosphere High-voltage electrospinning was performed to prepare nanofibrous membranes. Other process parameters are as follows: the flow rate is 1.0 mL / h, the distance between the receiving plate and the spinneret is 15 cm, and the voltage is 12 kV. The ambient temperature is (23±1)°C, and t...

Embodiment 2

[0026] Example 2: Preparation of PAN fibers by 4% w / w lithium chloride DMAc solution circulation high voltage electrospinning

[0027] With 4% w / v lithium chloride N, N-dimethylacetamide solution as the sheath liquid, the PAN solution in Example 1 as the core liquid, using a coaxial spinning head, high-voltage electrospinning through the circulation of the electrolyte solution PAN fibers were prepared and the flow ratio was controlled by two single-channel axial-flow syringe pumps.

[0028] The specific process parameters are as follows: the sheath / core liquid flow ratio is 0.4 / 2mL / h, the distance between the receiving plate and the spinneret is 15cm, and the voltage is 12kV. The ambient temperature is (23±1)°C, and the ambient humidity is 62±4%.

Embodiment 3

[0030] Example 3: Preparation of PAN fibers by circulating high-voltage electrospinning with 1% w / w lithium chloride DMAc solution

[0031] With 1% w / v lithium chloride N,N-dimethylacetamide solution as the sheath liquid, the PAN solution in Example 1 as the core liquid, using a coaxial spinning head, high-voltage electrospinning through the electrolyte solution circulation PAN fibers were prepared, and the flow ratio was controlled by two single-channel axial-flow syringe pumps, and other conditions were the same as in Example 2.

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Abstract

The invention relates to a method for preparing polyacrylonitrile nano-fiber by electrolyte solution circulation high-pressure electrostatic spinning, wherein the method is carried out on the basis of the invention of 'electrospinning coaxial spinning head device'. The method for preparing polyacrylonitrile nano-fiber by electrolyte solution circulation high-pressure electrostatic spinning is characterized in that the electrospinning is carried out by a coaxial spinning head; coaxial electrospinning outer sheath fluid is of mixed liquid comprising an electrolyte solution with high conductivity and an N,N-dimethyl acetamide solution; core fluid is acrylonitrile; the flow of the circulation electrolyte solution and the flow of the polyacrylonitrile spinning solution are respectively regulated by two single-channel axial flow injection pumps; and the nano-fiber is received by an aluminium foil flat plate. The electrolyte comprises inorganic salts dissolved into the N,N-dimethyl acetamide solution, such as lithium chloride, calcium chloride and sodium chloride. The content of the electrolyte is 1-6% by massic volume ratio in the N,N-dimethyl acetamide solution. The method disclosed by the invention has a simple preparation technology, and the prepared polyacrylonitrile nano-fiber has the advantages of small diameter, even distribution, low diameter dispersion and smooth fiber surface.

Description

technical field [0001] The invention relates to a method for preparing polyacrylonitrile nanofibers by high-voltage electrospinning with circulating electrolyte solution, and belongs to the technical field of polymer ultrafine fiber preparation. Background technique [0002] Polyacrylonitrile (PAN) nanofibers have a wide range of applications in biomedicine, superabsorbent resins, catalyst supports, ion exchange resins, pollution control, antibacterial and deodorizing, solid polymers, electrolytes, and filtration and separation. And using polyacrylonitrile PAN precursor as raw material, PAN-based carbon fiber can be obtained after oxidation stabilization, carbonization, graphitization and post-treatment. Because of its carbon content of more than 90% and its structural characteristics similar to microcrystalline polycyclic aromatics, it has become a high-performance composite material with good heat resistance, light weight, high tensile strength and high Young's modulus. F...

Claims

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Application Information

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IPC IPC(8): D01F6/18D01F1/00D01D5/00
Inventor 余灯广杨俊和王霞杨光智秦宏敏
Owner UNIV OF SHANGHAI FOR SCI & TECH
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