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Preparation method for bio-based degradable polymer superfine fibers

A technology for degrading polymers and ultrafine fibers, which is applied in the field of materials, can solve problems such as unstable preparation process, poor fiber continuity, and complicated production process, and achieve the effects of simple and controllable preparation method, realizing carbon cycle, and improving mechanical properties

Active Publication Date: 2020-05-29
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of preparation method of bio-based degradable polymer microfibers in order to overcome the defects of complex production process, poor fiber continuity, low yield and unstable preparation process in the above-mentioned prior art; especially A kind of preparation method of superfine fiber with core-shell structure

Method used

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  • Preparation method for bio-based degradable polymer superfine fibers
  • Preparation method for bio-based degradable polymer superfine fibers
  • Preparation method for bio-based degradable polymer superfine fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh a certain amount of poly(L-lactic acid) (viscosity average molecular weight 30000) and polybutyrolactam (viscosity average molecular weight 13000) according to the mass ratio of 5 / 5, dissolve in hexafluoroisopropanol, seal and stir at room temperature More than 12 hours, until the solution is uniform and transparent, let it stand for 1 hour to remove air bubbles, and prepare a uniform spinning stock solution with a concentration of 2wt%. Electrospinning was carried out under the conditions of voltage 30kV, flow rate 1.5mL / h, and distance between spinneret and collecting plate 12cm. The obtained fibers had an average diameter of 0.65 µm. The tensile stress-strain curve of the fiber membrane is as figure 1 shown. The tensile strength of the fiber membrane is 10.4MPa, and the elongation at break is 45%.

[0035] For the convenience of comparison, pure poly(L-lactic acid) fibers were prepared under the same conditions. Compared with pure poly(L-lactic acid) fibers,...

Embodiment 2

[0037] The preparation method is the same as in Example 1, except that the mass ratio of poly(L-lactic acid) to polybutyrolactam is 7 / 3, the solution concentration is 5wt%, the solution flow rate is 1mL / h, the spinneret and the collecting device The distance is 20cm. The obtained fibers had an average diameter of 0.69 µm. The tensile strength of the fiber membrane is 4.9MPa, and the elongation at break is 21%. The transmission electron micrographs of the obtained fibers are as follows: figure 2 As shown, it has a clear core-shell structure. Further adopt X-ray Energy Spectroscopy (EDS), such as image 3 As shown, it indicates that the shell layer is polylactic acid.

Embodiment 3

[0039] The preparation method is the same as in Example 1, except that the mass ratio of poly(L-lactic acid) to polybutyrolactam is 3 / 7, and the spinning voltage is 25kV. The obtained fibers had an average diameter of 0.59 µm. The tensile strength of the fiber membrane is 13.8MPa, and the elongation at break is 36%, which are respectively 5.6 times and 2.7 times higher than that of pure poly(L-lactic acid) fibers prepared under the same conditions.

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Abstract

The present invention relates to a preparation method for bio-based degradable polymer superfine fibers. The method comprises the following steps of dissolving a copolymer or a blend of polylactic acid and polybutyrolactam in a solvent, adding electrolyte, performing stirring at the room temperature until a mixed solution is uniform and transparent, and performing standing to remove bubbles to obtain a uniform spinning solution; and performing a solution high-voltage electrostatic spinning method on the spinning solution to obtain the bio-based degradable polymer superfine fibers. Compared with the prior art, the preparation method has the advantages that the preparation method is simple and controllable, and the obtained limiting strength and toughness are high.

Description

technical field [0001] The invention relates to the field of materials, in particular to a preparation method of bio-based degradable polymer ultrafine fibers. Background technique [0002] Polylactic acid is a biodegradable aliphatic polyester, which is biocompatible and completely biodegradable. It is a green and environmentally friendly biobased material. Polylactic acid fibers prepared by electrospinning technology can be used in the fields of sustained drug release, tissue engineering scaffolds, and filter materials. However, problems such as high brittleness, poor hydrophilicity and heat resistance of polylactic acid limit its application in more fields. Copolymerization and blending with other polymers is a common and easy way to improve the mechanical properties of polylactic acid. Polyamide is a widely used engineering plastic. Because of its good toughness, good heat resistance and good chemical stability, it can be used to improve the mechanical properties of po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/14D01F8/12D01F1/10
CPCD01F8/14D01F8/12D01F1/10
Inventor 赵黎明陈涛王乐军钟郭程张媛婷
Owner EAST CHINA UNIV OF SCI & TECH
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