Electrostatic spinning method for preparing micro-nano fibers in directional alignment

Abstract

The invention relates to an electrostatic spinning method for preparing micro-nano fibers in directional alignment. The method comprises the following steps: a spinning device is provided, wherein thespinning device comprises an injection assembly, a high-voltage power supply connected with the injection assembly and a receiving assembly arranged on one side of the injection assembly; the receiving assembly comprises an insulation part and at least two parallel bulging parts which bulges outwards from the surface of the insulation part and are distributed at intervals, and a power-on electrode is arranged on each bulging part; the receiving assembly further comprises a connection part for electrically connecting the power-on electrodes; a polymer is dissolved in an organic solvent to prepare an electrostatic spinning solution, and the electrostatic spinning solution is poured in the injection assembly; the high-voltage power supply is switched on for electrostatic spinning, an electric potential field is formed between the receiving assembly and the injection assembly, the electrostatic spinning solution is stretched under the effect of the electric potential field to form fibers,fibers are dragged to the receiving assembly under the effect of the electric potential field, and then the fibers rotate under the force of the power-on electrodes to form the fibers which are in directional alignment and perpendicular to the power-on electrodes. The steps are simple, and the operation is convenient.

Description

technical field [0001] The invention relates to an electrospinning method for preparing aligned micro-nano fibers, and belongs to the technical field of electrospinning. Background technique [0002] Electrospinning is that the spinnable solution overcomes the surface tension of the solution under the action of electrostatic attraction, and is pulled out from the tip of the "Taylor" cone formed by the spinning head to become a charged jet stream, which moves in the electric field. The jet stream solidifies with the volatilization of the solvent to form micro-nano fibrous substances, and finally gathers on the conductive receiving screen to form a fibrous film. [0003] In the process of electrospinning, randomly oriented micro-nanofibers are usually obtained on a conductive flat receiving screen. However, in applications in the fields of biomedicine, optics, electricity, and mechanical manufacturing, micro-nano fibers are often required to have good regularity and orientati...

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Problems solved by technology

[0004] However, when the parallel electrode method is used alone, due to the limitation of the distance between the two parallel electrodes in the receiving device, the length of the generally prepared aligned fibers does not exceed 5 mm.

However, when the rotary pumping method is used alone, it is difficult to obtain the ideal orientation effect for the ordered fibers generally prepared because the control effect on the spinning process is not obvious.

At the same time, when using conventional electrospinning methods to prepare ordered micro-nano fibers, usually the prepared fibers are directly adhered to the surface of the receiving device, often due to incomplete volatilization of the jet flow solvent, etc., it is difficult for the fibers to be released from the receiving plate. Take it down, which will limit the research and application of subsequent micro-nanofibers

[0005] At present, in the existing electrospinning method for preparing aligned micro-nano fibers, it has not yet been possible to prepare aligned micro-nano fibers that satisfy the requirements of good orientation effect, large output, and long length.

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