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Lignin base skin core structure nanometer/micron fiber and preparation method thereof

A skin-core structure and lignin-based technology, applied in the field of materials, can solve the problems of low electrical conductivity, limited viscoelasticity of lignin solution, and inability to coordinate the relationship between conductivity and solvent volatilization of lignin spinnable solution at the same time, and achieve The effect of mild conditions and simple preparation method

Active Publication Date: 2013-02-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this study is only a flaw in preventing the lignin solution from volatilizing too quickly through coaxial electrospinning technology.
At the same time, due to the relatively low molecular weight of lignin and its non-chain structure, the viscoelasticity of the lignin solution is limited; due to the low conductivity of the solution system, the electric field force on the solution can only stretch the lignin solution. Droplets form fibers by themselves, without being able to add larger loads, making it impossible to form lignin-based sheath-core fibers
[0007] At present, the limiting factor of the existing technology is mainly that the relationship between lignin spinnability, solution conductivity and solvent volatilization cannot be coordinated at the same time, so that it can form nano / micro fibers with skin-core structure

Method used

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  • Lignin base skin core structure nanometer/micron fiber and preparation method thereof
  • Lignin base skin core structure nanometer/micron fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Preparation of the core layer solution: put a mixture of 2.5g lignin and 2.5g polyacrylonitrile into 100g N, N-dimethylacetamide, stir to make it completely dissolve, and become a lignin mixed solution;

[0030] 2. Preparation of cortex solution: put 5g of polylactic acid into 50g of N,N-dimethylformamide, stir to dissolve it completely, and become a polymer solution;

[0031] 3. Coaxial electrospinning: use as figure 1In the coaxial electrospinning device shown, the positive and negative electrodes are connected to the coaxial needle 4 and the collecting plate 7 respectively, and the coaxial needle 4 and the collecting plate 7 are located in the constant temperature and humidity container 5 . The distance between the coaxial needle 4 of the electrospinning device and the grounded collecting plate 7 is 5 cm, the inner inner diameter of the coaxial needle 4 is 0.1 mm, and the outer inner diameter is 0.5 mm (that is, the outer inner diameter of the needle is greater th...

Embodiment 2

[0033] 1. Preparation of the core layer solution: put 3.25g of lignin and 1.75g ​​of polyurethane mixture into 50g of N, N-dimethylformamide, stir to make it completely dissolve, and become a lignin mixed solution;

[0034] 2. Preparation of cortex solution: put 5 g of cellulose into 25 g of lithium chloride / dimethylacetamide with a mass ratio of 7:93, stir to make it completely dissolve, and become a polymer solution;

[0035] 3. Coaxial electrospinning: use as figure 1 In the coaxial electrospinning device shown, the positive and negative electrodes are connected to the coaxial needle 4 and the collecting plate 7 respectively, and the coaxial needle 4 and the collecting plate 7 are located in the constant temperature and humidity container 5 . The distance between the electrospinning device coaxial needle 4 and the grounded collection plate 7 is 25cm, the inner inner diameter of the coaxial needle 4 is 1mm, and the outer inner diameter is 2.5mm (that is, the outer inner diam...

Embodiment 3

[0037] 1. Preparation of the core layer solution: put a mixture of 4.5g lignin and 0.5g polyethylene oxide into 5g acetone, stir to dissolve it completely, and become a polymer solution and a lignin mixed solution;

[0038] 2. Preparation of the cortex solution: put 5g of cellulose acetate into 50g of acetic acid, stir to dissolve it completely, and become a polymer solution;

[0039] 3. Coaxial electrospinning: use as figure 1 In the coaxial electrospinning device shown, the positive and negative electrodes are connected to the coaxial needle 4 and the collecting plate 7 respectively, and the coaxial needle 4 and the collecting plate 7 are located in the constant temperature and humidity container 5 . The distance between the coaxial needle head 4 of the electrospinning device and the grounded collecting plate 7 is 40cm, the inner layer inner diameter of the coaxial needle head 4 is 0.5mm, and the outer layer inner diameter is 1.5mm (that is, the outer layer inner diameter of...

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Abstract

The invention discloses a preparation method of a lignin base skin core structure nanometer / micron fiber. The preparation method comprises the following steps: (1) by mass, adding one part of mixture of lignin and petroleum base macromolecules into 1-20 parts of organic solvents, and obtaining a lignin mixing solution after evenly mixing and fully dissolving the mixture; adding 1 part of natural or synthetic macromolecules into 4-25 parts of solvents, and obtaining a macromolecule solution after evenly mixing and fully dissolving the natural or synthetic macromolecules; and (2)performing coaxial electric spinning, leading the lignin mixing solution and the macromolecule solution respectively into two layers of a coaxial needle head, and obtaining the lignin base skin core structure nanometer / micron fiber under the effects of 5-100kV high-voltage electrostatic field when the solutions are stably extruded out of the coaxial needle head. The preparation method is simple and moderate in conditions, reduces degree of diffusion of the lignin towards a skin layer simultaneously, and improves continuity and evenness of a core layer material in the fiber.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a lignin-based skin-core structure nano / micron fiber and a preparation method thereof. Background technique [0002] Skin-core structure nano / micron fiber is a nano / micron material, because the core layer and the skin layer are composed of different materials, compared with the traditional nano / micron fiber, it not only has the characteristics of small scale, large specific surface area and excellent physical properties. At the same time, the advantage of compounding two or more different components in a skin-core structure expands the application field and improves the material performance. The field has very broad application prospects. Nano / micro fiber with skin-core structure can be prepared by uniaxial electrospinning and coaxial electrospinning. Among them, uniaxial electrospinning is a process in which the electrospinning solution is sprayed through a uniaxial needle, and under ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/08D01F8/18D01F8/14D01F8/16D01F8/02D01F8/10D01D1/02D01D5/00D01D5/34
Inventor 敖日格勒游翔宇谌凡更
Owner SOUTH CHINA UNIV OF TECH
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