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

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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 crosslinki

Method used

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

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[0030] Example 1:

[0031] A preparation method of high ionic conductivity nano cellulose / polyvinyl alcohol hydrogel film includes the following steps:

[0032] (1) Weigh 5g of lignocellulose from which lignin has been removed, add 100g of concentrated sulfuric acid with a mass fraction of 48% and hydrolyze it under 45℃ water bath conditions for 2.5 hours, while stirring with a mechanical stirring blade at 200rpm, add a large amount after hydrolysis is complete The ultrapure water stops the reaction and obtains the cellulose mixed solution treated by sulfuric acid hydrolysis;

[0033] (2) Place the sulfuric acid hydrolyzed cellulose mixed solution obtained in step (1) in a high-speed centrifuge for 10 minutes at a speed of 8000 rpm, remove the supernatant after centrifugation, and repeatedly wash with ultrapure water After centrifugation, the pH of the supernatant liquid was 6.5 to obtain the cellulose precipitate modified by sulfuric acid and washed;

[0034] (3) The washed cellulos...

Example Embodiment

[0044] Example 2:

[0045] A preparation method of high ionic conductivity nano cellulose / polyvinyl alcohol hydrogel film includes the following steps:

[0046] (1) Weigh 5g of lignocellulose from which lignin has been removed, add 100g of concentrated sulfuric acid with a mass fraction of 48% and hydrolyze it under 45℃ water bath conditions for 2.5 hours, while stirring with a mechanical stirring blade at 250rpm, add a large amount after hydrolysis The ultrapure water stops the reaction and obtains the cellulose mixed solution treated by sulfuric acid hydrolysis;

[0047] (2) Put the sulfuric acid hydrolyzed cellulose mixed solution obtained in step (1) in a high-speed centrifuge for 7 minutes at a speed of 9000 rpm, remove the supernatant after centrifugation, and wash repeatedly with ultrapure water After centrifugation, the pH of the supernatant liquid was 6.5 to obtain the cellulose precipitate modified by sulfuric acid and washed;

[0048] (3) The washed cellulose precipitate o...

Example Embodiment

[0053] Example 3:

[0054] A preparation method of high ionic conductivity nano cellulose / polyvinyl alcohol hydrogel film includes the following steps:

[0055] (1) Weigh 5g of lignocellulose from which lignin has been removed, add 100g of concentrated sulfuric acid with a mass fraction of 48% and hydrolyze it in a water bath at 50℃ for 1.5h, while stirring with a mechanical stirring blade at 300rpm, add a large amount after the hydrolysis is complete The ultrapure water stops the reaction and obtains the cellulose mixed solution treated by sulfuric acid hydrolysis;

[0056] (2) Put the sulfuric acid hydrolyzed cellulose mixed solution obtained in step (1) into a high-speed centrifuge for 5 minutes at a speed of 10000 rpm, remove the supernatant after centrifugation, and repeatedly wash with ultrapure water After centrifugation, the pH of the supernatant liquid was 6.5 to obtain the cellulose precipitate modified by sulfuric acid and washed;

[0057] (3) The washed cellulose precipit...

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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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