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Nanocellulose compound temperature-sensitive type hydrogel and preparation method thereof

A nano-cellulose and temperature-sensitive technology, which is applied in the field of nano-cellulose composite temperature-sensitive hydrogel and its preparation, can solve the problems of uneven crosslink density, poor toughness, and low mechanical strength of the gel, and achieve Improved elasticity and gel strength and rupture strength, good biocompatibility, increased stiffness and elasticity

Active Publication Date: 2017-10-20
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional hydrogels are generally formed by chemical cross-linking. The hydrogel network structure has defects such as uneven cross-linking density, resulting in low mechanical strength and poor toughness of the gel, making it difficult to apply in fields that require high mechanical strength of materials.

Method used

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  • Nanocellulose compound temperature-sensitive type hydrogel and preparation method thereof
  • Nanocellulose compound temperature-sensitive type hydrogel and preparation method thereof
  • Nanocellulose compound temperature-sensitive type hydrogel and preparation method thereof

Examples

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Embodiment 1

[0030] An embodiment of the nanocellulose composite temperature-sensitive hydrogel and a preparation method thereof of the present invention. The preparation method of the nanocellulose composite temperature-sensitive hydrogel comprises the following steps:

[0031] Step 1: Take 5g of lignocellulose that has been de-lignified, add 100g of concentrated sulfuric acid with a mass fraction of 48%, and hydrolyze it in a water bath at 45°C for 2 hours, while stirring with a mechanical stirring paddle at 200rpm. After the hydrolysis, add a large amount of ultra-pure Water terminates the reaction to obtain a sulfuric acid-modified cellulose mixed solution.

[0032] Step 2: Place the cellulose mixed solution modified by sulfuric acid in a high-speed centrifuge for 5 minutes, the speed of the centrifuge is 8000rpm, remove the supernatant after centrifugation, and repeatedly wash the centrifuged precipitate with ultrapure water to The pH of the supernatant was 6.5, and the cellulose pre...

Embodiment 2

[0037] An embodiment of the nanocellulose composite temperature-sensitive hydrogel and a preparation method thereof of the present invention. The preparation method of the nanocellulose composite temperature-sensitive hydrogel comprises the following steps:

[0038]Step 1: Take 5g of lignocellulose that has been de-lignified, add 100g of concentrated sulfuric acid with a mass fraction of 48%, and hydrolyze it in a water bath at 45°C for 2 hours, while stirring with a mechanical stirring paddle at 200rpm. After the hydrolysis, add a large amount of ultra-pure Water terminates the reaction to obtain a sulfuric acid-modified cellulose mixed solution.

[0039] Step 2: Place the cellulose mixed solution modified by sulfuric acid in a high-speed centrifuge for 5 minutes, the speed of the centrifuge is 8000rpm, remove the supernatant after centrifugation, and repeatedly wash the centrifuged precipitate with ultrapure water to The pH of the supernatant was 6.5, and the cellulose prec...

Embodiment 3

[0044] An embodiment of the nanocellulose composite temperature-sensitive hydrogel and a preparation method thereof of the present invention. The preparation method of the nanocellulose composite temperature-sensitive hydrogel comprises the following steps:

[0045] Step 1: Take 5g of lignocellulose that has been de-lignified, add 100g of concentrated sulfuric acid with a mass fraction of 48%, and hydrolyze it in a water bath at 45°C for 2 hours, while stirring with a mechanical stirring paddle at 200rpm. After the hydrolysis, add a large amount of ultra-pure Water terminates the reaction to obtain a sulfuric acid-modified cellulose mixed solution.

[0046] Step 2: Place the cellulose mixed solution modified by sulfuric acid in a high-speed centrifuge for 5 minutes, the speed of the centrifuge is 8000rpm, remove the supernatant after centrifugation, and repeatedly wash the centrifuged precipitate with ultrapure water to The pH of the supernatant was 6.5, and the cellulose pre...

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Abstract

The invention discloses nanocellulose compound temperature-sensitive type hydrogel and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing cellulose nano-fibril gel, 2-methyl-2-propenoic acid-2-(2-methoxyethoxy)ethyl ester and methoxy polyethylene glycol methacrylate to obtained mixed liquid A; carrying out degassing treatment and ultrasonic dispersion treatment on the mixed liquid A to obtain mixed liquid B; after introducing nitrogen gas into the mixed liquid B, adding an initiator; uniformly stirring in a water bath to obtain the nanocellulose compound temperature-sensitive type hydrogel. The nanocellulose compound temperature-sensitive type hydrogel prepared by the preparation method has relatively great rigidity, good elasticity and good biocompatibility and has relatively high gel strength and rupture strength; the temperature-sensitive performance of the nanocellulose compound temperature-sensitive type hydrogel is not influenced by the adding amount of cellulose nano-fibrils; the nanocellulose compound temperature-sensitive type hydrogel has a good application prospect in the fields including intelligent temperature sensing, medicine controlled release, artificial muscle and the like.

Description

technical field [0001] The invention relates to the field of polymer composite materials, in particular to a nano-cellulose composite temperature-sensitive hydrogel and a preparation method thereof. Background technique [0002] Thermosensitive hydrogel is a kind of smart material that can respond to the corresponding volume of temperature changes. Due to the difference in thermodynamic properties, the hydrophilic groups and hydrophobic groups on the molecular chains present different conformations at different temperatures, causing the gel network to change. contraction and relaxation. Based on the characteristics of volume phase transition, temperature-sensitive hydrogels can realize the adsorption and desorption of solvents, and are widely used in drug sustained-release systems, flexible actuators, tissue engineering and other fields, and have become a research hotspot in the field of smart materials. Traditional hydrogels are generally formed by chemical cross-linking. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F291/06C08F291/08C08F220/28
CPCC08F251/02C08F283/065C08F220/282
Inventor 卿彦刘柳吴义强罗莎李蕾田翠花颜宁
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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