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Preparation method of polymer nanometer fiber bunch under independent state

A nanofiber and polymer technology, which is applied in the field of preparation of polymer nanofibers, can solve the problems of unreported PLLA nanofiber bundled porous materials and the like, and achieve the effect of simple process

Inactive Publication Date: 2015-04-29
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no reports of nanofiber bundles of PLLA and other polymers and porous materials composed of them.

Method used

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  • Preparation method of polymer nanometer fiber bunch under independent state
  • Preparation method of polymer nanometer fiber bunch under independent state
  • Preparation method of polymer nanometer fiber bunch under independent state

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Add 5 grams of PLLA into a round-bottomed flask filled with 100ml of tetrahydrofuran, and stir magnetically at 50°C for 2 hours to fully dissolve it to obtain a transparent and clear solution with a mass concentration of 5%, and then age it at 20°C for 1.5 hours.

[0023] 2. Transfer the solution to a low-temperature freezer at –20°C, and quench for 60 minutes to form a frozen liquid.

[0024] 3. Afterwards, add fresh distilled water to the freezing solution and transfer it to the refrigerator at 5°C. Change the fresh distilled water every 8 hours for 8 times, and remove the solvent tetrahydrofuran in the freezing solution by leaching.

[0025] 4. Pour out the distilled water, freeze the sample at –23°C for 2 hours, then freeze-dry at –50°C to obtain PLLA bundled nanofibers, as shown in the attached figure 1 shown. The porous material composed of nanofiber bundles is shown in the attached figure 2 shown.

[0026] The nanofibers prepared in this example are presen...

Embodiment 2

[0028] 1. Add 2 grams of PLLA into a round-bottomed flask containing 100ml of dimethylformamide, stir at 65°C for 3 hours to fully dissolve it, and prepare a PLLA / dimethylformamide solution with a mass fraction of 5%. The solution was then aged at 10 °C for 2 h.

[0029] 2. Quench the aged PLLA / dimethylformamide solution at –40°C for 180 min to form a frozen liquid.

[0030] 3. After that, add fresh distilled water to the freezing solution and transfer it to the refrigerator at 8°C. Change the fresh distilled water every 8 hours, and change the water 6 times, and remove the dimethylformamide in the freezing solution by leaching.

[0031] 4. Finally, pour out the distilled water, freeze at -23°C for 2 hours, and freeze-dry at -50°C to obtain PLLA nanofiber bundled porous materials, as shown in the attached image 3 shown.

[0032] The nanofibers prepared in this embodiment are in the form of bundles, the thickness of the fibers is 280 nanometers, the length is 41-48 microns, ...

Embodiment 3

[0034] 1. Add 5 grams of nylon 6 into a round-bottomed flask containing 100 ml of m-cresol, stir at 45 °C for 2.5 h to fully dissolve, and prepare a nylon 6 / m-cresol solution with a mass fraction of 5%.

[0035] 2. Aging the nylon 6 / m-cresol solution at 30°C for 120 minutes, and then quenching at 5°C for 5 minutes to form a frozen liquid.

[0036] 3. Afterwards, add fresh distilled water to the freezing solution and transfer it to the refrigerator at 8°C. Change the fresh distilled water every 8 hours, and change the water 7 times, and completely remove m-cresol by leaching.

[0037] 4. Finally, pour out the distilled water, freeze at -23°C for 2 hours, and freeze-dry at -50°C to obtain bundles of nylon 6 nanofibers. as attached Figure 4 shown.

[0038] The nanofibers prepared in this embodiment are in the form of bundles, the thickness of the fibers is 150-280 nanometers, the length is 5-10 microns, and the bundles have an arc of 30-50°.

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Abstract

The invention relates to a preparation method of polymer nanometer fiber, in particular to a preparation method of a polymer nanometer fiber bunch under an independent state. The preparation method comprises the following steps: dissolving a crystallized polymer in a solvent under a heating condition, so as to obtain a transparent solution with 1 to 5% based on mass percentage; and ageing for 30 minutes to 2 hours at 10 to 30 DEG C; transferring the solution in a low temperature refrigerating box under -40 to 5 DEG C; quenching the solution for 5 to 180 minutes to obtain a refrigerating liquid; then removing the solvent in a sample through a digestion method; freezing and drying to obtain the nanometer fiber bunch under the independent state. The porous material formed via the nanometer fiber bunch has a highly communicated porous structure, and the aperture is ranged from some microns to dozens of microns; the porosity is high, the specific surface area is large; and the preparation method is in sight of organizing the engineering support and absorbing or filtering the material.

Description

technical field [0001] The invention relates to a method for preparing polymer nanofibers, in particular to a method for preparing bundles of polymer nanofibers with independent shapes. Background technique [0002] Nanofibers and their materials have ultra-fine diameter, high specific surface area, interconnected pores and high porosity, which make them widely used in the fields of tissue engineering scaffolds, filtration, adsorption and other materials. It has attracted the attention of industrial application scientists. The preparation methods of polymer nanofibers include solution phase separation, thermal phase separation and electrospinning, etc., but the nanofibers obtained by these methods are basically randomly arranged to form porous materials, and a small amount of them are one-dimensional or two-dimensional aligned. porous material. Due to the limitation of process technology, bundled polymer nanofiber materials have not been reported yet. [0003] The bundle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/247D01F6/62D01F6/60D01F11/08
Inventor 刘海清李凯娜刘瑞来刘敏
Owner FUJIAN NORMAL UNIV
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