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Preparation method of high-strength high-swelling nanocellulose and polyving akohol composite hydrogel

A technology of nano-cellulose and composite hydrogel, which is applied in the field of bioengineering, can solve the problems of limiting the application of gel, producing toxicity, and polluting the environment, and achieves simple preparation process, improved aspect ratio and specific surface area, and improved strength The effect of the degree of swelling

Inactive Publication Date: 2015-12-16
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no report on the use of nanocellulose to prepare high-strength, high-swellable nanocellulose / polyvinyl alcohol hydrogels in a dimethyl sulfoxide / water solvent system
[0006] CN102786642A discloses a preparation method of nanocellulose / polyvinyl alcohol gel composite material, adding potassium persulfate (KPS), sodium bisulfite (SBS) and acrylic acid (AA), crosslinking agent (NMBA) to promote nanofiber However, the gel prepared by this method uses a large number of chemical reagents for cross-linking, which not only has high cost, but also pollutes the environment and produces toxicity during use. These shortcomings greatly limit the application of the gel. Applications in Bioengineering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Nanocellulose preparation process steps:

[0034] A. Sieve the bamboo powder raw material of 40-60 meshes, dry it, accurately weigh 10g with an electronic balance, wrap it with filter paper and put it into a Soxhlet extractor to prepare 450ml of benzene alcohol extract, and extract it at 90°C Extract for 6 hours, filter and wash until neutral, including 300ml of benzene and 150ml of ethanol in the benzene alcohol extract;

[0035] B. Put the washed and filtered raw materials into a beaker, add 400ml of deionized water, and treat it with 1-1.25wt% sodium chlorite under acidic conditions, add the same amount of sodium chlorite again after 1h, and also under acidic conditions Under treatment, repeat adding 5 to 7 times to remove most of the lignin and obtain comprehensive cellulose;

[0036] C, prepare 2~3wt% potassium hydroxide solution, process the hemicellulose obtained in the first step at 90° C. for 2~3 hours, to remove most of the hemicellulose therein;

[0037] D....

Embodiment 2

[0041] The preparation method of the high-strength and high-swellability nanocellulose / polyvinyl alcohol composite hydrogel comprises the following steps:

[0042] (1) Take 5g of the nanocellulose suspension, drop a certain amount of deionized water to keep the water content in the suspension at 20g, add 80g of dimethyl sulfoxide solution, and magnetically stir to prepare a mixed dispersion;

[0043] (2) Weigh 7.5 g of polyvinyl alcohol, add it to the dispersion in step (1), and stir magnetically at 95° C. for 3 h;

[0044] (3) The dispersion liquid in step (2) was left to stand at a constant temperature for 30 minutes at a temperature of 60° C. to obtain a mixed dispersion of nanocellulose and polyvinyl alcohol;

[0045] (4) Pour the dispersion obtained in step (3) into the mould, and let it stand for 10 minutes;

[0046](5) Freeze the mixed dispersion obtained in step (4) at a low temperature for 12 hours at -20°C, take it out and place it at a constant temperature for 4 ho...

Embodiment 3

[0050] The preparation method of the high-strength and high-swellability nanocellulose / polyvinyl alcohol composite hydrogel comprises the following steps:

[0051] (1) Take by weighing 10g of the nanocellulose suspension, add a certain amount of deionized water dropwise to keep the water content in the suspension at 20g, add in 80g of dimethyl sulfoxide solution, and magnetically stir to prepare a mixed dispersion;

[0052] (2) Weigh 7.5 g of polyvinyl alcohol, add it to the dispersion in step (1), and stir magnetically at 95° C. for 3 h;

[0053] (3) The dispersion liquid in step (2) was left to stand at a constant temperature for 30 minutes at a temperature of 60° C. to obtain a mixed dispersion of nanocellulose and polyvinyl alcohol;

[0054] (4) Pour the dispersion obtained in step (3) into the mould, and let it stand for 10 minutes;

[0055] (5) Freeze the mixed dispersion obtained in step (4) at a low temperature for 12 hours at -20°C, take it out and place it at a cons...

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Abstract

The invention discloses a preparation method of high-strength high-swelling nanocellulose and polyving akohol composite hydrogel. The method comprises the following steps that nanocellulose suspension is added in dimethyl sulfoxide solvent, and magnetic stirring is conducted to prepare mixed dispersion liquid; polyving akohol is added, and magnetic stirring is conducted for 3 h on the condition that the temperature is 95 DEG C; standing is conducted for 30 min at the constant temperature of 60 DEG C, the dispersion liquid is placed at the constant temperature after being frozen at low temperature, and freezing and thawing circulation is conducted for 5-8 times; obtained hydrogel is put in deionized water to swap out the dimethyl sulfoxide solvent in the gel, and the nanocellulose and polyving akohol composite gel is obtained. According to the preparation method of the high-strength high-swelling nanocellulose and polyving akohol composite hydrogel, reactions are physical reactions, and pollution to the environment in the preparation process is extremely low; by means of a mixed solvent system of dimethyl sulfoxide and water, formation of a uniform network structure of the nanocellulose and polyving akohol gel can be effectively facilitated, the formed three-dimensional interpenetrating network structure can effectively improve the strength and the swelling degree of the gel, the dimethyl sulfoxide can be directly swapped out from the gel after the reaction is completed, and the obtained biomass gel is free of toxicity and pollution.

Description

technical field [0001] The invention relates to a preparation method of high-strength and high-swellability nano-cellulose / polyvinyl alcohol composite hydrogel, belonging to the field of bioengineering. Background technique [0002] Hydrogels, as ideal materials for biomedical applications, have attracted increasing research interest. Polyvinyl alcohol (PVA) is a water-soluble polymeric polymer material, and it has very good biocompatibility and low toxicity. The application of PVA hydrogel in the field of biomedicine has attracted more and more attention. Dimethyl sulfoxide is a good aprotic solvent. Using it as a solvent system mixed with water can make polyvinyl alcohol gel form a uniformly dispersed cross-linked network structure, so that it can form in the process of gel formation. Uniform pore size. Therefore, the gel prepared by using the mixed solvent system of dimethyl sulfoxide and water has better mechanical strength than the polyvinyl alcohol gel prepared by p...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/24C08L1/02C08L29/04
Inventor 徐朝阳李健昱
Owner NANJING FORESTRY UNIV
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