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Conductive hydrogel based on nanocellulose-polyacrylamide-metal ions as well as preparation method and application of conductive hydrogel

A polyacrylamide and nanocellulose technology, applied in the field of sensors, can solve the problems of imperfect influence of hydrogel performance, and achieve the effect of excellent self-healing performance, simple process and easy operation.

Pending Publication Date: 2022-05-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned patents have improved the performance of hydrogels by adding nanocellulose, this type of polymer only utilizes nanocellulose C 6 carboxyl or C 2 、C 3 The research on the synergistic effect of carboxyl and aldehyde groups on the properties of hydrogels is still incomplete.

Method used

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  • Conductive hydrogel based on nanocellulose-polyacrylamide-metal ions as well as preparation method and application of conductive hydrogel
  • Conductive hydrogel based on nanocellulose-polyacrylamide-metal ions as well as preparation method and application of conductive hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of preparation method of the conductive hydrogel based on nanocellulose-polyacrylamide-metal ion (flow process see figure 1 ), including the following steps:

[0042] (1) Preparation of nanocellulose suspension: Take 30g of bleached coniferous wood pulp and add it to 100g of water, use a Valli beater to process it for 6 minutes without hanging heavy objects, and then add 0.48g 2,2 to the cellulose suspension , 6,6-tetramethylpiperidin-1-oxyl group (TEMPO) and 3g NaBr, add sodium hypochlorite solution (the consumption of sodium hypochlorite is added by 13.5mmol / g cellulose, effective in sodium hypochlorite Chlorine content is 194.3g / L), by adding 1M NaOH, the pH value of the reaction is maintained at 10.0, after reacting for 1h, adding 50mL of absolute ethanol to terminate the reaction to obtain a cellulose suspension, and using a high-pressure homogenizer to homogenize under 90bar pressure for 10 TEMPO-nanocellulose (TNFC) containing carboxyl groups was obtained...

Embodiment 2

[0045] A method for preparing a conductive hydrogel based on nanocellulose-polyacrylamide-metal ions, comprising the following steps:

[0046] (1) Preparation of nanocellulose suspension: Take 30g of bleached coniferous wood pulp and add it to 100g of water, use a Valli beater to process it for 6 minutes without hanging heavy objects, and then add 0.48g 2,2 to the cellulose suspension , 6,6-tetramethylpiperidin-1-oxyl group (TEMPO) and 3g NaBr, add sodium hypochlorite solution (the consumption of sodium hypochlorite is added by 13.5mmol / g cellulose, effective in sodium hypochlorite Chlorine content is 194.3g / L), by adding 1M NaOH, the pH value of the reaction is maintained at 10.0, after reacting for 1h, adding 50mL of absolute ethanol to terminate the reaction to obtain a cellulose suspension, and using a high-pressure homogenizer to homogenize under 90bar pressure for 10 TEMPO-nanocellulose (TNFC) containing carboxyl groups was obtained after the second time; 15g of sodium p...

Embodiment 3

[0049] A method for preparing a conductive hydrogel based on nanocellulose-polyacrylamide-metal ions, comprising the following steps:

[0050] (1) Preparation of nanocellulose suspension: Take 30g of bleached coniferous wood pulp and add it to 100g of water, use a Valli beater to process it for 6 minutes without hanging heavy objects, and then add 0.48g 2,2 to the cellulose suspension , 6,6-tetramethylpiperidin-1-oxyl group (TEMPO) and 3g NaBr, add sodium hypochlorite solution (the consumption of sodium hypochlorite is added by 13.5mmol / g cellulose, effective in sodium hypochlorite Chlorine content is 194.3g / L), by adding 1M NaOH, the pH value of the reaction is maintained at 10.0, after reacting for 1h, adding 50mL of absolute ethanol to terminate the reaction to obtain a cellulose suspension, and using a high-pressure homogenizer to homogenize under 90bar pressure for 10 TEMPO-nanocellulose (TNFC) containing carboxyl groups was obtained after the second time; 15g of sodium p...

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Abstract

The invention discloses conductive hydrogel based on nanocellulose-polyacrylamide-metal ions as well as a preparation method and application of the conductive hydrogel. The method comprises the following steps: (1) pretreating sufficiently defibered cellulose slurry by adopting TEMPO oxidation to obtain TEMPO-nano cellulose; then adding sodium periodate into the TEMPO-nano cellulose, and carrying out a reaction in a dark place to obtain DATNFC-TNFC containing carboxyl groups and aldehyde groups; and (2) uniformly mixing the DATNFC-TNFC containing carboxyl and aldehyde group, polyacrylamide and metal ions under heating and stirring conditions, then adding a photoinitiator, carrying out a reaction under ultraviolet irradiation, and after the reaction is finished, carrying out cooling molding to obtain the conductive hydrogel. The conductive hydrogel prepared by the method has excellent self-healing performance, mechanical performance and sensing performance, and can be used for wearable sensor devices.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to a conductive hydrogel based on nanocellulose-polyacrylamide-metal ions and its preparation method and application. Background technique [0002] With the continuous development of smart electronic devices, wearable polymer sensors with excellent degradability, biocompatibility, and sensing performance have attracted extensive attention in the fields of bioelectric interfaces, artificial tissues, and electronic skin. Wearable polymer sensors mainly use the geometric deformation of sensing elements under the action of external force to convert them into electrical signals, and detect physical variables from them. In the study of mechanical sensors, conductive hydrogel is used as the sensing element, and the conductive filler is mixed into the hydrogel matrix to make the sensing element. However, the research on conductive hydrogels with stable structure, excellent sens...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L33/26C08L1/04C08K3/16G01D5/00
CPCC08J3/075G01D5/00C08J2333/26C08J2401/04C08K3/16C08K2201/001
Inventor 李金鹏付浩成王斌陈克复李军
Owner SOUTH CHINA UNIV OF TECH
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