TEMPO oxidized nanocellulose-based composite hydrogel and preparation method thereof

A technology of nanocellulose and composite hydrogel, which is applied in the field of polymer materials, can solve problems such as poor mechanical properties and usability, hinder development, and single function, and achieve improved mechanical properties and usability, improved mechanical strength, and good adhesion. Adjunctive effect

Active Publication Date: 2022-02-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, natural polymer hydrogels have defects such as poor stability, easy degradation, poor mechanical properties and usability, which hinder their further development.
In addition, most of the existing hydrogels have a uniform structure, which often leads to a single function, which limits its application range to a certain extent.

Method used

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  • TEMPO oxidized nanocellulose-based composite hydrogel and preparation method thereof
  • TEMPO oxidized nanocellulose-based composite hydrogel and preparation method thereof
  • TEMPO oxidized nanocellulose-based composite hydrogel and preparation method thereof

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preparation example Construction

[0036] The present invention is a preparation method of polyvinyl alcohol / chitosan / TEMPO oxidized nanocellulose-polyvinyl alcohol composite hydrogel with a double-layer structure, and its main raw material is the nanocellulose in TEMPO oxidized nanocellulose as a reserve on the earth The most abundant natural polymer cellulose derivative, with the advantages of renewable, wide source, good biocompatibility and degradability, is considered to be the most attractive sustainable green material in the 21st century; it consists of deacetylation unit (D-glucosamine) and chitosan composed of acetylated units (N-acetyl-D-glucosamine), a large number of hydrophilic groups such as amino and hydroxyl groups on the main chain can be used as cross-linking sites. An ideal hydrogel raw material; polyvinyl alcohol, abbreviated as PVA, is a water-soluble polymer material, and the abundant hydroxyl groups on the main chain make it have a large number of hydrogen bond interactions in the molecule...

Embodiment 1

[0046]Step 1, join 0.2g chitosan and 0.8g polyvinyl alcohol in the 1% (v / v) acetic acid solution of 7g, make the mass fraction of chitosan be 2.5%, the mass fraction of polyvinyl alcohol be 10 %, stirred at 85°C for 4h to dissolve completely, and cooled to room temperature to prepare polyvinyl alcohol / chitosan mixed solution;

[0047] Step 2, adding 7g of TEMPO oxidized nanocellulose solution with a mass fraction of 5wt% to the mixed solution prepared in step 1, stirring at room temperature for 1h, to obtain polyvinyl alcohol / chitosan / TEMPO oxidized nanocellulose with a single network structure Cellulose hybrid hydrogel;

[0048] Step 3, the mixed hydrogel obtained in step 2 was placed at -20°C, frozen for 1 hour, poured 5 g of polyvinyl alcohol solution with a mass fraction of 10 wt % on its surface, and placed at -20°C to continue freezing for 12 hours. After 12 hours, it was placed at room temperature to thaw naturally, and a polyvinyl alcohol / chitosan / TEMPO oxidized nanoc...

Embodiment 2

[0050] Step 1, join 0.03g chitosan and 0.48g polyvinyl alcohol in the 0.1% (v / v) acetic acid solution of 5.49g, make the massfraction of chitosan be 0.5%, the massfraction of polyvinyl alcohol is 8%, stirred at 85°C for 5h to dissolve completely, cooled to room temperature to prepare polyvinyl alcohol / chitosan mixed solution;

[0051] Step 2, adding 9g of TEMPO oxidized nanocellulose solution with a mass fraction of 4.5wt% to the mixed solution prepared in step 1, stirring at room temperature for 0.5h, to obtain polyvinyl alcohol / chitosan / TEMPO with a single network structure Oxidized nanocellulose hybrid hydrogel;

[0052] Step 3, the mixed hydrogel obtained in step 2 was placed at -25°C, frozen for 1.5h, poured 6g of polyvinyl alcohol solution with a mass fraction of 10wt% on its surface, and placed at -25°C to continue freezing for 14h. After 14 hours, it was placed at room temperature to thaw naturally, and a polyvinyl alcohol / chitosan / TEMPO oxidized nanocellulose-polyvin...

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Abstract

The invention provides TEMPO oxidized nano-cellulose-based composite hydrogel and a preparation method thereof. The method comprises the following steps: 1, dissolving chitosan, polyvinyl alcohol and TEMPO oxidized nano-cellulose in an acetic acid solution, wherein the mass ratio of chitosan to polyvinyl alcohol to TEMPO oxidized nano-cellulose is (0.03-0.35): (0.14-0.8): (0.01-0.405); performing stirring to obtain a mixed system, freezing the mixed system, and obtaining a gel-like mixture; 2, pouring a polyvinyl alcohol solution on the surface of the gelatinous mixture, freezing the obtained mixture at the temperature of 30 DEG C below zero to 10 DEG C below zero, and then performing unfreezing to obtain the TEMPO oxidized nanocellulose-based composite hydrogel, so that the mechanical property and functionality of the hydrogel are improved by utilizing a double-crosslinking network and a double-layer asymmetric structure.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a TEMPO oxidized nanocellulose-based composite hydrogel and a preparation method thereof. Background technique [0002] As the most widely sourced natural polymer in nature, cellulose has the advantages of environmental protection, low price, biodegradability, high mechanical strength and water absorption. Cellulose-based natural polymer hydrogels with a three-dimensional network structure have better biocompatibility and environmental sensitivity than synthetic polymer hydrogels, and have become a research hotspot in recent years. [0003] However, natural polymer hydrogels have defects such as poor stability, easy degradation, poor mechanical properties and usability, which hinder their further development. In addition, most of the existing hydrogels have a uniform structure, which often leads to a single function, which limits its application range to a certain exte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L1/04C08L5/08C08L29/04
CPCC08J3/075C08J2429/04C08J2405/08C08J2301/04
Inventor 戴磊李紫秀贺瓶王晓婉王建倪永浩
Owner SHAANXI UNIV OF SCI & TECH
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