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Method for preparing nanocellulose/polyvinyl alcohol hydrogel membrane with high ionic conductivity

A technology of nano-cellulose and ionic conductivity, which is applied in the field of preparation of hydrogel membranes, can solve the problems of unmentioned ionic conductivity performance of composite materials, difficulty in controlling the preparation process, and not being environmentally friendly enough, so as to improve ion conductivity , large free volume, and the effect of improving ionic conductivity

Active Publication Date: 2018-10-12
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art CN102786642A, a nanocellulose / polyvinyl alcohol gel composite material is disclosed. In the preparation process of this material, more chemical reagents such as crosslinking agents and initiators are used. The preparation process is difficult to control and is not environmentally friendly. And the ionic conductivity of the final composite material is not mentioned

Method used

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  • Method for preparing nanocellulose/polyvinyl alcohol hydrogel membrane with high ionic conductivity

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Embodiment 1

[0031] A preparation method of high ion conductivity nanocellulose / polyvinyl alcohol hydrogel film, comprising the following steps:

[0032] (1) Weigh 5g of lignin-removed lignocellulose, add 100g of concentrated sulfuric acid with a mass fraction of 48%, and hydrolyze it for 2.5h under water bath conditions at 45°C, and stir at 200rpm with a mechanical stirring paddle at the same time. After the hydrolysis, add a large amount of Ultrapure water stops the reaction to obtain a mixed solution of cellulose hydrolyzed by sulfuric acid;

[0033] (2) The cellulose mixed solution obtained in step (1) through sulfuric acid hydrolysis is placed in a high-speed centrifuge and centrifuged for 10min, the rotating speed of the centrifuge is 8000rpm, remove the supernatant after centrifugation, and wash repeatedly with ultrapure water The precipitate after centrifugation until the pH of the supernatant is 6.5, and the cellulose precipitate after sulfuric acid modification and washing is obt...

Embodiment 2

[0045] A preparation method of high ion conductivity nanocellulose / polyvinyl alcohol hydrogel film, comprising the following steps:

[0046] (1) Weigh 5 g of lignin-removed lignocellulose, add 100 g of concentrated sulfuric acid with a mass fraction of 48%, and hydrolyze it for 2.5 hours at 45° C. in a water bath, while stirring at 250 rpm with a mechanical stirring paddle. After the hydrolysis, add a large amount of Ultrapure water stops the reaction to obtain a mixed solution of cellulose hydrolyzed by sulfuric acid;

[0047] (2) The cellulose mixed solution obtained in step (1) through sulfuric acid hydrolysis is placed in a high-speed centrifuge and centrifuged for 7min, the rotating speed of the centrifuge is 9000rpm, remove the supernatant after centrifugation, and wash repeatedly with ultrapure water The precipitate after centrifugation until the pH of the supernatant is 6.5, and the cellulose precipitate after sulfuric acid modification and washing is obtained;

[004...

Embodiment 3

[0054] A preparation method of high ion conductivity nanocellulose / polyvinyl alcohol hydrogel film, comprising the following steps:

[0055] (1) Weigh 5g of lignocellulose that has been de-lignified, add 100g of concentrated sulfuric acid with a mass fraction of 48%, and hydrolyze it for 1.5h under the condition of a water bath at 50°C, while stirring at 300rpm with a mechanical stirring paddle, and add a large amount of Ultrapure water stops the reaction to obtain a mixed solution of cellulose hydrolyzed by sulfuric acid;

[0056] (2) The cellulose mixed solution obtained in step (1) through sulfuric acid hydrolysis is placed in a high-speed centrifuge and centrifuged for 5min, the speed of the centrifuge is 10000rpm, remove the supernatant after centrifugation, and wash repeatedly with ultrapure water The precipitate after centrifugation until the pH of the supernatant is 6.5, and the cellulose precipitate after sulfuric acid modification and washing is obtained;

[0057] (...

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Abstract

The invention relates to a method for preparing a nanocellulose / polyvinyl alcohol hydrogel membrane with high ionic conductivity. The method includes the following steps of 1, preparing nanocelluloseand dispersing the nanocellulose in an aqueous solution to obtain a nanocellulose solution; 2, adding polyvinyl alcohol into the nanocellulose solution obtained in step 1 and uniformly dispersing polyvinyl alcohol to obtain a nanocellulose / polyvinyl alcohol mixture; 3, adding isopropanol into the nanocellulose / polyethylene mixture obtained in step 2, uniformly stirring the mixture above, pouring the mixture into a culture dish for freezing-thawing cycle, and then obtaining the nanocellulose / polyvinyl alcohol hydrogel membrane with high ionic conductivity. According to the nanocellulose / polyvinyl alcohol hydrogel membrane, the free volume among gel molecular chains is large, there are many pore structures, and the ionic conductivity is high.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and in particular relates to a preparation method of a hydrogel film. Background technique [0002] Hydrogel is a kind of hydrophilic and water-retaining material with three-dimensional network structure. Polyvinyl alcohol (PVA) hydrogel is a non-toxic, high mechanical strength, and excellent biocompatibility material, which is widely used in biomedicine, food, agriculture and other fields. In recent years, the use of PVA composite hydrogels as solid electrolyte separators in supercapacitors has become a research hotspot. [0003] Nanocellulose (CNFs) is a fibril with a diameter of nanometers obtained by dismantling natural plant fibers by strong acid, oxidation or mechanical shearing. Due to its large aspect ratio and many surface hydroxyl groups, it entangles with each other in the water system to present a three-dimensional network structure. The composite hydrogel structure prepa...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J5/18C08L1/02C08L29/04
CPCC08J3/075C08J5/18C08J2301/02C08J2429/04
Inventor 乔建政吴义强刘柳卿彦罗莎李贤军李蕾田翠花
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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