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
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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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