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Method for imparting crimp structure to polymer micro-nano fiber

A micro-nano fiber and micro-nano technology, applied in the direction of fiber type, fiber treatment, fabric elongation, etc., can solve the problems of disappearance of mechanical nonlinearity, instability of mechanical nonlinearity, uncertainty of crimp structure, etc., and increase the degree of orientation Effect

Active Publication Date: 2019-05-28
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to study the curl structure of Tianre collagen, the stress relaxation method is usually used to biomime the curl structure of collagen fibers, but for different materials with similar properties, the curl structure cannot be obtained with certainty by simple plasticizer heat soaking or vacuum heat treatment, Moreover, the mechanical nonlinearity presented by this curly structure is also unstable. With repeated loading and unloading, the mechanical nonlinearity will gradually disappear.

Method used

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  • Method for imparting crimp structure to polymer micro-nano fiber
  • Method for imparting crimp structure to polymer micro-nano fiber
  • Method for imparting crimp structure to polymer micro-nano fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A method for giving L-polylactic acid-polycaprolactone copolymer micro-nano fiber crimped structure, comprising the following steps:

[0046] (1) Dichloromethane (DCM) and dimethylformamide (DMF) are configured into 10ml solution at a ratio of 7:3, and 1g of L-polylactic acid-polycaprolactone copolymerized with an intrinsic viscosity of 3.6dl / g is added to it. Stir until the left-handed polylactic acid-polycaprolactone copolymer is completely dissolved to obtain a spinning solution of the left-handed polylactic acid-polycaprolactone copolymer, and then use the spinning solution of the left-handed polylactic acid-polycaprolactone copolymer The oriented micro-nanofiber film prepared by electrospinning into a planar structure (receive the micro-nanofiber film on the drum, cut it along the axial direction after receiving, and obtain the micro-nanofiber film; the oriented micro-nanofiber film refers to the micro-nanofiber film. The fibers in the film are preferentially arran...

Embodiment 2

[0054] The content of embodiment 2 is basically the same as embodiment 1, and its difference is:

[0055] In step (2): stretching the micro-nanofiber film prepared in step (1) continuously for five times along the fiber orientation direction, the stretching ratio of each stretching is 120%.

[0056] Using the method described in this example, a L-polylactic acid-polycaprolactone copolymer micro-nanofiber film with a stable fiber crimp structure can be prepared, and the curl degree of the fiber crimp structure is 0.389. A uniaxial tensile test was carried out on the L-polylactic acid-polycaprolactone copolymer micro-nanofiber film with a fiber crimp structure prepared in this example, and the measured mechanical nonlinear region was 138%. The L-polylactic acid-polycaprolactone copolymer micro-nanofiber film with a fiber crimp structure prepared in this example also has a larger mechanical nonlinear region.

Embodiment 3

[0058] The content of embodiment 3 is basically the same as embodiment 1, and its difference is:

[0059] In step (2): the micro-nanofiber film prepared in step (1) is stretched once along the fiber orientation direction, and the stretching ratio is 140%.

[0060] The method described in this example can be used to prepare a micro-nano fiber film of L-polylactic acid-polycaprolactone copolymer with a stable fiber crimp structure.

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Abstract

The invention discloses a method for imparting a crimp structure to a polymer micro-nano fiber. The method comprises the following steps that (1) a polymer is prepared into an oriented micro-nano fiber film or an oriented micro-nano fiber tube; (2) the micro-nano fiber film or the micro-nano fiber tube is stretched at least once in the fiber orientation direction to elastically deform the micro-nano fiber film or the micro-nano fiber tube, and then a tensile load is removed; (3) the surface of the micro-nano fiber film or the micro-nano fiber tube processed in the step (2) is uniformly sprayedwith a plasticizer; and (4) the micro-nano fiber film or the micro-nano fiber tube treated by the step (3) is subjected to single-side cooling treatment by gas flow to obtain a micro-nano fiber filmwith a stable fiber crimp structure or a micro-nano fiber tube with the stable fiber crimp structure. The method has a simple process, good reproducibility and high universality, and facilitates large-scale industrial application; and the prepared fiber crimp structure has good stability and can still show good mechanical nonlinearity after multiple times of force action.

Description

technical field [0001] The invention belongs to the field of polymer material processing, and in particular relates to a method for endowing polymer micro-nano fibers with a crimped structure. Background technique [0002] The wavy coiled structure of collagen fibers contributes to the expression of tissue nonlinear mechanical properties, promotes long-distance communication between individual cells, and can also provide excellent elasticity and prevent tissue damage caused by excessive deformation, such as ligaments, blood vessels and Intestines etc. In order to study the curl structure of Tianre collagen, the stress relaxation method is usually used to biomime the curl structure of collagen fibers, but for different materials with similar properties, the curl structure cannot be obtained with certainty by simple plasticizer heat soaking or vacuum heat treatment, Moreover, the mechanical nonlinearity presented by this curly structure is also unstable, and the mechanical no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H3/011D04H3/03D06C3/00D06M13/144D06M101/32D06B1/02D01D5/00
Inventor 王小峰孟鑫李倩牛宗武张博郭欣蒋晶侯建华江永超
Owner ZHENGZHOU UNIV
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