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Method for enhancing anti-freeze and tensile properties of cellulose ion hydrogel, anti-freeze stretchable cellulose ion hydrogel and application

A technology of tensile properties and cellulose, applied in the field of antifreeze stretchable cellulose ion hydrogel, cellulose ion hydrogel enhanced antifreeze and tensile properties, can solve hydrogel tensile and electrical properties Problems such as instability, limiting the application of cellulose ion hydrogel, loss of tensile and electrical conductivity, etc., to achieve the effect of improving frost resistance, good mechanical properties and electrical properties, and enhancing freeze resistance and tensile properties

Active Publication Date: 2019-07-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cellulose ionic hydrogels usually lack mechanical properties, resulting in unstable hydrogel stretching and electrical properties.
In addition, cellulose ion hydrogels will inevitably lose their tensile and conductive properties at low temperatures, which severely limits the application of cellulose ion hydrogels in the field of electronic devices.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0050] In a preferred embodiment of the present invention, the preparation method of cellulose ion hydrogel comprises the steps:

[0051] Allyl glycidyl ether is added into the cellulose solution for reaction to obtain allyl cellulose, and then the allyl cellulose is crosslinked to obtain cellulose ion hydrogel.

[0052] In the preferred embodiment provided by the present invention, the raw materials of the preparation method of cellulose ion hydrogel are easy to obtain, the process is simple, and easy to control, which is conducive to the preparation of large-scale cellulose ion hydrogel.

[0053] In a preferred embodiment of the present invention, the molar ratio of allyl glycidyl ether to anhydroglucose units in cellulose is (7.5-8.5):1.

[0054] By controlling the molar ratio of allyl glycidyl ether to the anhydroglucose unit in cellulose to (7.5-8.5):1, so that allyl glycidyl ether can react with the anhydroglucose unit in cellulose to obtain high allyl base content, cel...

Embodiment 1

[0075] This embodiment provides a kind of antifreeze stretchable cellulose ion hydrogel, which is prepared according to the following steps:

[0076] (1) Add 5.1g of cellulose to 80g of aqueous solution of sodium hydroxide and urea, dissolve it in a constant temperature reaction tank at -12.5°C, stir vigorously, and obtain a completely dissolved and transparent cellulose solution with a mass concentration of 6wt%. , wherein, in the aqueous solution that is dissolved with sodium hydroxide and urea, the mass concentration of sodium hydroxide is 7wt%, and the mass concentration of urea is 12wt%;

[0077] (2) Add 28.74 g of allyl glycidyl ether dropwise into the cellulose solution, and react for 24 hours at 30°C under nitrogen protection, wherein, the allyl glycidyl ether and the cellulose in the cellulose solution are The molar ratio of anhydroglucose units is 8;

[0078] (3) washing the product obtained in step (2) with 500 mL of ether, and vacuum-drying at 30° C. to remove the...

Embodiment 2

[0083] This example provides a kind of antifreeze stretchable cellulose ion hydrogel. The difference between the preparation method of the antifreeze stretchable cellulose ion hydrogel provided in this example and the preparation method of Example 1 is that , in step (5), soaking time in sodium chloride solution is 20min.

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Abstract

The invention provides a method for enhancing the anti-freeze and tensile properties of cellulose ion hydrogel, anti-freeze stretchable cellulose ion hydrogel and application, relating to the technical field of ion hydrogel. The method for enhancing the anti-freeze and tensile properties of the cellulose ion hydrogel comprises steps as follows: enabling the cellulose ion hydrogel to be immersed into a chlorinated metal salt solution, and dipping for 10-40min to obtain the anti-freeze stretchable cellulose ion hydrogel. Current cellulose ion hydrogel has the technical problems that the tensileproperty is poor and tensile and wire properties can lose at low temperature as well. According to the method, by enabling the cellulose ion hydrogel to be immersed in the chlorinated metal salt solution, metal ions and chloride ions in chlorinated metal salt enter the cellulose ion hydrogel, so that the anti-freeze property of the cellulose ion hydrogel is effectively improved, and the prepared anti-freeze stretchable cellulose ion hydrogel still has good mechanical property and chemical property at the low temperature.

Description

technical field [0001] The invention relates to the technical field of ionic hydrogels, in particular to a method for enhancing antifreeze and tensile properties of cellulose ionic hydrogels, antifreeze stretchable cellulose ionic hydrogels and applications. Background technique [0002] Natural polymeric ionic hydrogels have attracted extensive attention due to their biodegradable, biocompatible, and nontoxic properties. Cellulose as an abundant and sustainable natural polymer to prepare polysaccharide-based ionic hydrogels is considered an emerging research field. However, cellulose ion hydrogels usually lack mechanical properties, resulting in unstable hydrogel stretching and electrical properties. In addition, cellulose ion hydrogels will inevitably lose their tensile and conductive properties at low temperatures, which severely limits the application of cellulose ion hydrogels in the field of electronic devices. [0003] In view of this, the present invention is propo...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L1/28
CPCC08J3/075C08J2301/28
Inventor 陈广学仝瑞平田君飞何明辉陈奇峰万小芳
Owner SOUTH CHINA UNIV OF TECH