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Preparation method of hollow fiber in coaxial electrostatic spinning

A coaxial electrospinning and fiber technology, which is applied in fiber processing, rayon manufacturing, hollow filament manufacturing, etc., can solve the problems of complex operation steps, influence of hollow fiber performance, and incomplete removal of core layer materials, etc., to achieve Low cost, mild reaction conditions, and easy operation

Inactive Publication Date: 2013-05-08
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although this method can prepare hollow fibers, the operation steps are relatively complicated. Two different solutions need to be prepared as shell solution and core solution respectively. After coaxial electrospinning, subsequent washing, extraction and calcination are required. and other steps to remove the core layer material to obtain a hollow fiber
At the same time, the material of the core layer cannot be completely removed sometimes, and the residual core layer material may affect the performance of the hollow fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Dissolve polycaprolactone with a molecular weight of 150,000 in a mixed solvent of dichloromethane and DMF with a volume ratio of 4:1 to prepare a solution with a mass fraction of 8%;

[0028] (2) The solution prepared in the above step (1) is used as the outer tube spinning solution, injected into the outer tube of the coaxial spinneret, and air is passed into the inner tube, and the coaxial electrospinning is carried out at room temperature. The spinning parameters are: the flow rate of air in the inner tube is 0.2 mL / h, the flow rate of solution in the outer tube is 1 mL / h, the voltage is 15 kV, and the receiving distance is 15 cm.

[0029] In this embodiment, the inner / outer diameters of the inner tube of the coaxial spinneret are 0.5 / 0.7 mm, and the inner / outer diameters of the outer tube are 1.2 / 2 mm, respectively.

[0030] The obtained polycaprolactone nanofiber with a fiber diameter of 130-370nm has a hollow structure.

Embodiment 2

[0032] (1) Dissolve PLGA (50 / 50) with a molecular weight of 70,000 in tetrahydrofuran / N,N-dimethylformamide mixed solvent with a volume ratio of 3:1 to prepare a solution with a mass fraction of 18%;

[0033] (2) The solution prepared in the above step (1) is used as the outer tube spinning solution, injected into the outer tube of the coaxial spinneret, and air is passed into the inner tube, and the coaxial electrospinning is carried out at room temperature. The spinning parameters are: the flow rate of air in the inner tube is 0.2 mL / h, the flow rate of solution in the outer tube is 0.8 mL / h, the voltage is 15 kV, and the receiving distance is 15 cm.

[0034] In this embodiment, the inner / outer diameters of the inner tube of the coaxial spinneret are 0.5 / 0.7 mm, and the inner / outer diameters of the outer tube are 1.2 / 2 mm, respectively.

[0035] The prepared PLGA nanofiber with a fiber diameter of 150-225nm has a hollow structure.

Embodiment 3

[0037] (1) Dissolve polyvinylpyrrolidone with a molecular weight of 300,000 in ethanol solvent to prepare a solution with a mass fraction of 10%;

[0038] (2) The solution prepared in the above step (1) is used as the outer tube spinning solution, injected into the outer tube of the coaxial spinneret, and air is passed into the inner tube, and the coaxial electrospinning is carried out at room temperature. The spinning parameters are: the flow rate of air in the inner tube is 0.4 mL / h, the flow rate of solution in the outer tube is 1 mL / h, the voltage is 15 kV, and the receiving distance is 10 cm.

[0039] In this embodiment, the inner / outer diameters of the inner tube of the coaxial spinneret are 0.5 / 0.7 mm, and the inner / outer diameters of the outer tube are 1.2 / 2 mm, respectively.

[0040] The obtained polyvinylpyrrolidone micron fiber with a fiber diameter of 2000-3000nm has a hollow structure.

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Abstract

The invention discloses a preparation method of hollow fiber in coaxial electrostatic spinning. The method includes a first step of selecting synthetic macromolecule and enabling the synthetic macromolecule to be solved in solution and stirred until the synthetic macromolecule is completely solved according to prepared final fiber, and a second step of using the solution obtained in the first step as outer pipe spinning liquid which is injected into an outer pipe of a coaxial spinning nozzle, ventilating air into an inner pipe and conducting the coaxial electrostatic spinning under the condition of room temperature. The prepared fiber is in an obvious hollow structure and can be applied to the medical field of drug carriers, artificial dialysis and the like. The preparation method of the hollow fiber in the coaxial electrostatic spinning has the advantages of being simple and convenient to operate, temperate in reaction condition, low in cost, and capable of being completed just by one step without need of using inner layer materials and subsequent processing, greatly saving time and material cost, meanwhile avoiding influences of the remained inner layer materials on the hollow fiber and having good application prospect.

Description

technical field [0001] The invention relates to a preparation method in the field of hollow fibers, in particular to a method for preparing hollow fibers by coaxial electrospinning. Background technique [0002] Electrospinning technology can prepare fibers with a diameter ranging from tens of nanometers to several microns. The fiber diameter is controllable, has a large specific surface area, and exhibits good functional properties. Due to its simple experimental device, low cost, The advantages of higher yield and easy control have aroused great interest of researchers over the years. [0003] Compared with solid fibers with a single structure, one-dimensional fibers with hollow structures have unique advantages in many aspects, such as targeted drug release, catalysis, separation, sensing, and microfluidic channels. Therefore, the preparation of hollow fibers is of great significance. Previous researchers used electrospinning to prepare hollow fibers mainly through the ...

Claims

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Application Information

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IPC IPC(8): D01D5/00D01D5/24
Inventor 施丽君周涓余震何丹农
Owner SHANGHAI JIAO TONG UNIV
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