Method for preparing ordered coaxial structural micro and nano fibers

A technology of micro-nano fibers and ordered arrangement is applied in the field of preparation of micro-nano fibers of ordered coaxial structure, which can solve the problems of low proportion of conductive polymers, limiting the application of composite fibers, reducing the electrical conductivity of fiber membranes, and the like. Achieve the effect of eliminating secondary pollution, avoiding excessive contact, and having a high degree of orderly arrangement of fibers

Inactive Publication Date: 2012-05-09
QINGDAO UNIV
4 Cites 22 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Conductive polymer (such as PANI and PPY) composite fibers can be prepared by traditional electrospinning technology, but in order to be able to spin fibers, a large amount of non-conductive polymer components (such as polyethylene oxide PEO) must be added to the spinning solution to adjust Therefore, the conductive polymer composite fiber prepared by this pr...
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Method used

The rotary disc type electrospinning device (belonging to the inventor's invention patent) that the present embodiment uses comprises injector 1, spinning solution 2, electrospinning nozzle 3, rotating disc 4, high voltage power supply 5, motor 6 And the plastic substrate (or disk collector) 7 that is pasted with rectangular slit groove; When its rotating disk type electrospinning device prepares the PMMA fiber that arranges orderly, carry out electrospinning precursor polymethacrylate first Preparation of ester (PMMA) solution: 1.5 g of PMMA was dissolved in N, N dimethylformamide (DMF, 4 g) and tetrahydrofuran (THF, 4 g) solvent with a mass ratio of 1: 1, magnetically stirred at room temperature for 3 hours Obtain the DMF/THF solution of PMMA as the el...
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Abstract

The invention belongs to the technical field of micro and nano fibers prepared by electrostatic spinning, and relates to a method for preparing a conductive polymer micro and nano fiber array of an ordered coaxial structure by adopting a rotary disk collecting electrostatic spinning technology, in particular to a method for preparing ordered coaxial structural micro and nano fibers. The method comprises the following steps of: covering a flexible plastic substrate with a rectangular slit shape on a collector of a rotary disk type electrostatic spinning device, and obtaining ordered micro and nano fibers by using transverse relative motion of the collector and high-speed moving electro-spun fibers; and treating the ordered micro and nano fibers serving as a template by a chemical wet method, wrapping a layer of conductive polymer on the surface of the fiber template by in-situ polymerization, and thus obtaining the conductive polymer micro and nano composite fibers of the ordered coaxial structure. The method is high in ordered arrangement degree of the fibers, simple in process, reliable in principle and easy to operate; and the fibers have high electric conductivity and wide application range.

Application Domain

Technology Topic

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  • Method for preparing ordered coaxial structural micro and nano fibers
  • Method for preparing ordered coaxial structural micro and nano fibers
  • Method for preparing ordered coaxial structural micro and nano fibers

Examples

  • Experimental program(1)

Example Embodiment

[0011] Examples:
[0012] The rotating disc electrospinning device (belonging to the inventor’s invention patent) used in this embodiment includes a syringe 1, a spinning solution 2, an electrospinning nozzle 3, a rotating disc 4, a high-voltage power supply 5, a motor 6 and a sticker with Rectangular slit grooved plastic substrate (or disc collector) 7; when the rotating disc electrospinning device prepares ordered PMMA fibers, the electrospinning precursor polymethylmethacrylate (PMMA ) Solution preparation: Dissolve 1.5 g of PMMA in the solvent of N, N dimethylformamide (DMF, 4 g) and tetrahydrofuran (THF, 4 g) with a mass ratio of 1:1, and magnetically stir at room temperature for 3 hours to obtain PMMA DMF/THF solution is used as the precursor of electrospinning; the spinning device adopts a rotating disc type electrospinning device, and the height of the electrospinning nozzle 3 relative to the rotating disc 4 is continuously adjustable in the range of 0.5 to 10 cm. The spinning nozzle 3 is at a static position, with a spinning height of 8 cm, a spinning voltage of 6 kV, and a rotating disk with a radius of 23 cm. The surface of a rotating disc 4 cut from plexiglass is covered with annular metal aluminum foil as an electrode. The inner and outer radii are respectively For 10 cm and 20 cm, the driving motor 6 drives the rotating disc 4 at a speed between 360 rpm and 540 rpm. When the high-speed electrostatic drive jet and the landing turntable linear velocity are synchronized or nearly synchronized, the fibers are arranged in order The collection plate of the rotating disc 4 is covered with a layer of flexible plastic substrate 7 with rectangular slit-like 4 mm grooves. Due to the existence of the flexible plastic substrate 7, it is convenient for ordered fiber transfer and cutting selection.
[0013] In this embodiment, when the conductive polymer composite micro-nano fibers with an orderly arranged coaxial structure are prepared by in-situ polymerization and wrapping, PMMA fibers prepared by a rotating disc type electrospinning device are used as templates, and they are wrapped by surface adsorption and in-situ polymerization. A layer of conductive polymerized aniline forms a coaxial structure. The polyaniline dopant used in the in-situ polymerization process is weak sulfosalicylic acid. The specific steps include:
[0014] In the first step, the plastic substrate that collects PMMA fibers in an orderly arrangement is peeled off from the rotating disk collector;
[0015] The second step is to fix the ordered fibers on the plastic substrate 7 with conductive carbon glue where there are no rectangular slits.
[0016] In the third step, the plastic substrate 7 is immersed in the just prepared aniline polymerization reaction tank. The specific sequence is: pour the aniline monomer and sulfosalicylic acid solution into the reaction tank, and then immerse the plastic substrate with fibers. Finally, an aqueous solution of ammonium persulfate is added; the composition of the polymerization reaction solution is: 0.93 g of aniline, 4.56 g of ammonium persulfate, 1.28 g of sulfosalicylic acid, 70 ml of distilled water, and the temperature of the reaction tank is maintained at 0-4 degrees Celsius;
[0017] In the fourth step, after the polymerization reaction for 1 hour, the plastic substrate is taken out of the reaction tank, rinsed with distilled water, and dried under vacuum at room temperature to obtain PANI/PMMA composite micro-nano fibers with an ordered coaxial structure.
[0018] The PANI/PMMA composite micro/nano fiber prepared in this example has been tested and its room temperature conductivity is 10 -1 -10 0 S/cm, higher than the conductivity of the conductive polyaniline composite fiber prepared by traditional electrospinning. It can be seen from the scanning electron microscope (SEM) photo that there are many polyaniline nanopillars or nanorods, nanoparticles and nanometers on the surface of the fiber. Whiskers, this surface structure increases the specific surface area of ​​the fiber, enhances the fiber's ability to adsorb particles in the air, and improves the sensitivity of the sensor; in addition, the orderly arranged coaxial structure of the micro-nano fibers on the plastic substrate 7 also It can be transferred to other substrates such as glass or silicon wafers. The PMMA component in the coaxial fiber can be removed by organic solvents or by heat treatment to obtain pure polyaniline micro-nanotubes.
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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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