Carbon nanotube-enhanced carboxymethyl xylan/polyacrylic acid composite hydrogel and preparation method thereof

A technology of composite hydrogel and carboxymethyl wood is applied in the field of carbon nanotube reinforced carboxymethyl xylan/polyacrylic acid composite hydrogel and its preparation, and can solve the problem of low strength, low strength of biomass-based hydrogel, Restricted applications, carbon nanotubes cannot react, etc., to achieve the effect of easy industrialization, excellent mechanical properties, and enhanced strength

Active Publication Date: 2021-07-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common problem is that carbon nanotubes cannot react well with other substances, which limits their application.
However, the strength of biomass-based hydrogels is generally not high

Method used

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  • Carbon nanotube-enhanced carboxymethyl xylan/polyacrylic acid composite hydrogel and preparation method thereof
  • Carbon nanotube-enhanced carboxymethyl xylan/polyacrylic acid composite hydrogel and preparation method thereof
  • Carbon nanotube-enhanced carboxymethyl xylan/polyacrylic acid composite hydrogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this example, a carbon nanotube reinforced carboxymethyl group / polyacrylic acid composite hydrogel, the specific preparation steps are as follows:

[0033] (1) Add a sodium hydroxide solution (sodium hydroxide and xylose unit in xylan in xylosaccharide), 0.8: 1), alkalized 10min, sodium chloroacetate (chloroacetic acid) The molar ratio of the xylose unit in sodium and xylose is 1: 1), placed in a microwave reactor, 300W heating to 70 ° C, reaction 10min, fell to room temperature after completion, and 2x volumes of 80 % Ethanol precipitation, filtration, then remove unreacted reagents with ethanol, the obtained precipitate is dissolved, lyophilized, to obtain carboxymethylbacteria;

[0034] (2) Among the acrylic solutions of the mass fraction of 10%, 8 wt% (acrylic) carboxymethylbacterosans, 0.5 wt% (acrylic) carbon nanotubes, 0.5 wt% (based on acrylic acid) FECL 3 , 0.5 wt% (based on acrylic acid) crosslinking agent N, N'-methylene bispacrylamide, nitrogen gas bubbles ...

Embodiment 2

[0037] In this example, a carbon nanotube reinforced carboxymethyl group / polyacrylic acid composite hydrogel, the specific preparation steps are as follows:

[0038] (1) Add a sodium hydroxide solution (sodium hydroxide and xylose unit in xylose unit in xylose), 1: 1 of sodium hydroxose unit), alkalized 20min, sodium chloroacetate (chloroacetic acid) The molar ratio of the xylose unit in sodium and xylosaccharide is 2: 1), placed in a microwave reactor, 400W heating to 80 ° C, reaction for 20 min, and fell to room temperature after completion, 3 times volume of 80 of the reaction liquid % Ethanol precipitation, filtration, then remove unreacted reagents with ethanol, the obtained precipitate is dissolved, lyophilized, to obtain carboxymethylbacteria;

[0039] (2) In an acrylic solution of 15%, 10% by weight (acrylic) carboxymethylbin, 2 wt% (based on acrylic) carbon nanotubes, 2 wt% (based on acrylic acid) FECL. 3 , 0.75 wt% (acrylic) crosslinking agent N, N'-methylene bis acryl...

Embodiment 3

[0042] In this example, a carbon nanotube reinforced carboxymethyl group / polyacrylic acid composite hydrogel, the specific preparation steps are as follows:

[0043](1) Add a sodium hydroxide solution (sodium hydroxide with xylose unit in xylan) to 4 wt% of xylosan solution (sodium hydrolyzate), alkalized 30min, sodium chloroacetate (chloroacetic acid) The molar ratio of the xylose unit in sodium and xylosaccharide is 3: 1), placed in a microwave reactor, 550W heating to 90 ° C, reactive 30 min, and fell to room temperature after the reaction is completed, 80 of the reaction liquid % Ethanol precipitation, filtration, then remove unreacted reagents with ethanol, the obtained precipitate is dissolved, lyophilized, to obtain carboxymethylbacteria;

[0044] (2) Among the acrylic solutions of mass fraction of 20%, 12 wt% (acrylic) based carboxymethylbin, 4 wt% (acrylic acid) carbon nanotubes, 2.5 wt% (based on acrylic acid) FECL 3 1 wt% (acrylic acid) crosslinking agent N, N'-methyl...

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Abstract

The invention belongs to the field of composite hydrogel materials, and discloses a carbon nanotube reinforced carboxymethyl xylan / polyacrylic acid composite hydrogel and a preparation method thereof. Dissolve acrylic acid in deionized water, then add carboxymethyl xylan, ferric chloride, carbon nanotubes and cross-linking agent to mix evenly, pass nitrogen to remove oxygen, add initiator to initiate reaction, and then add cross-linking accelerator The cross-linking reaction is carried out at a temperature of 50-70 DEG C, and the reaction product is washed and dried to obtain a carbon nanotube reinforced carboxymethyl xylan / polyacrylic acid composite hydrogel. The present invention adopts biodegradable, biocompatible and special xylan of physical and chemical properties to prepare hydrogel, and introduces acrylic acid and Fe 3+ Perform physical cross-linking and ion cross-linking to enhance the strength of xylan-based hydrogel. The invention expands the industrial application of the xylan type hemicellulose, and provides an important and effective way for the high-value utilization of the hemicellulose.

Description

Technical field [0001] The present invention belongs to the field of composite hydrogel materials, and more particularly to a carbon nanotube reinforced carboxymethyltrogan / polyacrylate composite hydrogel and a preparation method thereof. Background technique [0002] The activated hydroxyl group on the xylan molecular chain provides various possible opportunities for chemical modification of hemicellulose, which can improve the reaction activity of xylosans by chemically modified means to impart a specific functional group of xylosan. The effect of carboxymethylene half cellulose in pharmaceutically acceptable carboxylated derivatives of other natural polysaccharides, using this characteristic, carboxymethyltrogan can be used as chemicals in different areas, including food or medicine. [0003] Carbon nanotubes serve as one-dimensional nanomaterials, light weight, perfect, with many abnormal mechanics, electrical and chemical properties. Carbon nanotubes mainly consist of seve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08J3/24C08L33/02C08L5/00C08K3/04C08F220/06C08F222/38
CPCC08F220/06C08J3/075C08J3/246C08J2333/02C08J2405/00C08K2201/011C08K3/041C08F222/385
Inventor 任俊莉刘昕昕常敏敏何贝
Owner SOUTH CHINA UNIV OF TECH
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