A method for preparing flexible auxetic materials by template electrospinning

An auxetic material and template technology, which is used in textiles and papermaking, filament/thread forming, non-woven fabrics, etc., can solve the problems of large deformation of fabric products, high mesh hardness, insufficient flexibility, etc. The effect of improving production efficiency

Inactive Publication Date: 2019-11-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned auxetic materials use fibers or yarns in the preparation process, and the materials are flexible, but the main process is still based on traditional knitting and weaving processes, and the deformation of the fabric product is too large; although the auxetic mesh is novel, the mesh Higher hardness and insufficient flexibility; in order to expand the application of flexible auxetic materials, the formed auxetic materials must have certain flexibility and stability, that is, a structure with overall order and local disorder

Method used

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  • A method for preparing flexible auxetic materials by template electrospinning
  • A method for preparing flexible auxetic materials by template electrospinning
  • A method for preparing flexible auxetic materials by template electrospinning

Examples

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Effect test

Embodiment 1

[0038] Example 1 Preparation of polyamide 6 tubular flexible auxetic material with a concave hexagonal honeycomb structure braided with conductive threads: (a) using conductive threads to weave a collection template with a concave hexagonal honeycomb structure (such as figure 1 shown); (b) the high polymer polyamide 6 was spun and collected on the collection template prepared in step (a) by means of melt electrospinning; (c) the flexible stretch film collected in step (b) The expansion material is peeled off from the collection template; (d) the flexible auxetic material is subjected to heat treatment to improve the mechanical properties of the flexible auxetic material. Since the material is directly formed into a tube, it can be used as an artificial blood vessel. Due to the auxetic effect, it can prevent blood vessels It explodes when it is blocked, and because it has the same curvature, it will not block the blood flow when it is subjected to bending deformation.

Embodiment 2

[0039] Example 2 Preparation of 3D printed chiral structure polyacrylonitrile flexible auxetic material: (a) 3D printing additive processing method is used to prepare collection template with chiral structure (such as figure 2 shown); (b) the high polymer polyacrylonitrile is spun and collected on the collection template prepared in step (a) by solution electrospinning; (c) the flexible auxetic collected in step (b) The material is peeled off from the collection template; (d) carbonizing the flexible auxetic material can produce carbon fiber with auxetic effect, which can be used in the field of composite materials and aerospace to improve the isotropic curvature of the composite material and improve its Impact resistance, crease resistance.

Embodiment 3

[0040] Example 3 Electron beam etching star structure low molecular weight polyethylene, polyurethane, high molecular weight polyethylene blended flexible auxetic material preparation, post-treatment can be used to heat the low molecular weight polyethylene, the structure is more stable, polyurethane provides greater Elasticity: (a) using electron beam etching technology to prepare a collection template with a star structure; (b) using solution electro-blended spinning to spin high polymer low molecular weight polyethylene, polyurethane, high molecular weight polyethylene and collect On the collection template prepared in step (a); (c) peeling off the flexible auxetic material collected in step (b) from the collection template; (d) carrying out hot-pressing treatment to the flexible auxetic material, low molecular weight polyethylene in Fusion bonding of polyurethane and high molecular weight polyethylene under hot pressing to improve the mechanical properties and structural st...

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Abstract

The invention discloses a method for adopting template electrospinning for preparing a flexible auxetic material. The method comprises the steps of 1, preparing a collection template with a pattern or a concave-convex structure; 2, adopting a high voltage electric field for performing static electricity traction spinning on a polymer solution or a polymer fusion solution and collecting the solution on the collection template prepared in the step 1; 3, stripping the flexible auxetic material collected in the step 2 from the collection template; 4, performing postprocessing on the flexible auxetic material so as to improve the mechanical property of the flexible auxetic material or giving the functions to the flexible auxetic material. The method can be used for continuous or intermittent preparation of the flexible auxetic material, and improving the production efficiency of the flexible auxetic material; the prepared flexible auxetic material can be used for the fields of garments, filtering material, biomedicine, tissue engineering, photoelectric materials, surge guard, sensors, composites and the like.

Description

technical field [0001] The invention relates to a method for preparing a flexible auxetic material with auxetic performance by means of electrospinning, and belongs to the technical field of preparation of auxetic structural materials for textile and clothing. Background technique [0002] Auxetic material refers to the material with negative Poisson's ratio effect, that is, the phenomenon that the material becomes wider perpendicular to the stretching direction when stretched, and the material becomes thicker when compressed. Auxetic materials are known as one of the smart materials in the 21st century, and foam materials, polymer materials and composite materials with auxetic effects are being produced continuously. The auxetic structure is made of flexible materials and can provide a basis for its wide application. At present, a variety of flexible auxetic materials have been prepared by using the auxetic structure, including auxetic fibers, auxetic yarns, and auxetic fab...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): D04H1/728D01D5/00
CPCD01D5/0076D04H1/728D10B2501/00D10B2505/04D10B2509/00
Inventor杜赵群许巧丽何玲娥
OwnerDONGHUA UNIV