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Method for preparing nano-fibers with special structures by using electrostatic spinning

A nanofiber, electrospinning technology, applied in fiber processing, fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of difficult operation, high cost, complicated post-processing process, etc., and achieve simple experimental equipment, easy operation and wide range of The effect of suitability

Inactive Publication Date: 2012-07-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the post-treatment process is more complicated, the operation is more difficult, and the cost is higher [Lin Jinyou, Ding Bin. Industrial Textiles. 2009, 11: 1-5]
The above methods are not controllable by the structure of the hole.

Method used

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  • Method for preparing nano-fibers with special structures by using electrostatic spinning
  • Method for preparing nano-fibers with special structures by using electrostatic spinning
  • Method for preparing nano-fibers with special structures by using electrostatic spinning

Examples

Experimental program
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Effect test

preparation example Construction

[0026] 1. Preparation of electrospinning precursor solution: configure polymer (PVP (polyvinylpyrrolidone), PMMA (polymethyl methacrylate), PAN (polyacrylonitrile), etc.) with a mass fraction of 1-20% solution, static Spinning is carried out after removing air bubbles.

[0027] 2. Electrospinning steps: Put the precursor solution configured in the above steps into the syringe, adjust the voltage of the high voltage generator to 5-50kV, set the receiving distance (the distance between the nozzle and the receiver) to 5-25 cm, and then start spinning Silk, and finally collected ultrafine nanofibers.

[0028] The ultrafine nanofibers prepared in the above steps are put into a separation kettle of a supercritical extraction device, and the nanofibers are foamed by a supercritical carbon dioxide rapid depressurization method. The foaming pressure is set at 4-20Mpa, the temperature is set at 50-100°C, and the soaking time is set at 5-60min. In the nanofiber, the supersaturated carb...

Embodiment 1

[0030] (1) Dissolve PMMA (polymethyl methacrylate) in ethyl acetate, stir for 4 hours to form a polymer solution with a mass fraction of 7%, and let stand to remove air bubbles.

[0031] (2) Add the polymer solution prepared in step 1 into the syringe, adjust the voltage to 18kV, set the receiving distance to 10cm, and set the flow rate of the syringe pump to 0.02mL / min. Turn on the spinning device to spin and collect PMMA (polymethyl methacrylate) ultrafine nanofibers.

[0032] (3) Put the ultra-fine nanofibers prepared in the above steps into the separation kettle of the supercritical extraction device, and use supercritical carbon dioxide to quickly reduce the pressure under the conditions of a pressure of 8Mpa, a temperature of 80°C, and a soaking time of 10min. By foaming the nanofibers, PMMA (polymethyl methacrylate) ultrafine nanofibers with a wrinkled structure can be obtained.

Embodiment 2

[0034] (1) Dissolve PMMA (polymethyl methacrylate) in ethyl acetate, stir for 4 hours to form a polymer solution with a mass fraction of 7%, and let stand to remove air bubbles.

[0035] (2) Add the polymer solution prepared in step 1 into the syringe, adjust the voltage to 20kV, set the receiving distance to 15cm, and set the flow rate of the syringe pump to 0.02mL / min. Turn on the spinning device to spin and collect PMMA (polymethyl methacrylate) ultrafine nanofibers.

[0036] (3) Put the ultra-fine nanofibers prepared in the above steps into the separation kettle of the supercritical extraction device, and use supercritical carbon dioxide to quickly reduce the pressure under the conditions of 6Mpa pressure, 80°C temperature and 10min soaking time By foaming the nanofibers, PMMA (polymethyl methacrylate) ultrafine nanofibers with a wrinkled structure can be obtained.

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Abstract

The invention discloses a method for preparing nano-fibers with special structures by using electrostatic spinning. The method comprises the following steps of: (1) preparing high molecule nano-fibers by using an electrostatic spinning technology; and (2) forming the special structures of fluffs and wrinkles on the surfaces of the nano-fibers by using a supercritical carbon dioxide quick depressurization method. The method has the advantages that: (1) the nano-fibers are prepared by the electrostatic spinning technology, an experimental device is simple and easy to operate, and the diameters of the prepared nano-fibers are controllable and adjustable; (2) a supercritical carbon dioxide microcellular foaming technology is adopted, so that the special structures of the fluffs and the wrinkles on the surfaces of the nano-fibers, such as the depths, widths and the like of the wrinkles, can be regulated by regulating foaming time, foaming pressure and foaming temperature; and (3) the method is applied to various high molecular polymers, and has a wide application range.

Description

Technical field: [0001] The invention belongs to the field of macromolecular materials, and relates to a method for preparing nanofibers with special structures by using electrospinning technology. Background technique: [0002] Electrospinning technology is a simple, efficient, and versatile method that can obtain fibers with diameters ranging from tens to hundreds of nanometers. In recent years, it has received extensive attention from researchers. Nanofibers prepared by electrospinning technology have the advantages of large specific surface area and uniform fiber diameter. At present, nanofibers prepared by electrospinning have been applied in various fields such as filter membranes, ultra-high sensitivity biosensors, catalyst carriers, tissue engineering, dye-sensitized solar cells [Lu Ping, Ding Bin.Recent Pat Nanotechnol, 2008, 2(3 ): 169-182]. Electrospinning technology is that the polymer solution is charged with static electricity in an electrostatic field, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/16D01F6/20D01F6/18D06M11/76
Inventor 方涛李璐李若松
Owner XI AN JIAOTONG UNIV
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