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Preparation method and application method of tempo nano cellulose-polyacrylic acid gel

A polyacrylic acid gel, nanocellulose technology, applied in the field of polymer composite conductive materials

Active Publication Date: 2021-09-10
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, there is no carbon nanotube-TEMPO nanocellulose-polyacrylic acid conductive self-healing gel with good mechanical properties, electrical conductivity and self-healing properties.

Method used

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  • Preparation method and application method of tempo nano cellulose-polyacrylic acid gel
  • Preparation method and application method of tempo nano cellulose-polyacrylic acid gel
  • Preparation method and application method of tempo nano cellulose-polyacrylic acid gel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Step 1, the preparation of TEMPO nano-cellulose suspension, its concrete method step comprises:

[0064] (1) Weigh 0.02g of TEMPO and 0.2g of NaBr into 300mL of deionized water in sequence, and stir the above mixture fully with a magnetic stirrer at 5°C. After TEMPO and NaBr are completely dissolved, add 1 g of pulverized bleached wood pulp fiber powder to the reaction system; (2) stir vigorously until the cellulose is evenly dispersed, then add 20 g of NaClO to the system, and add 0.4 mol L -1 NaOH solution to control the pH of the reaction system at about 9; (3) filter the oxidized cellulose after reacting for 5 hours, and wash with deionized water for 3 to 5 times to obtain oxidized cellulose; (4) use deionized water to filter the oxidized cellulose Supplemented as 1mg ml -1 In an ice-water bath, oxidized cellulose was peeled off into cellulose nanofibers by ultrasonication at 200W power for 4 minutes, and the prepared fiber nanofiber suspension was stored in a refr...

Embodiment 2

[0070] Step 1, the preparation of TEMPO nano-cellulose suspension, its concrete method step comprises:

[0071] (1) Weigh 0.033g of TEMPO, and add 0.33g of NaBr into 400mL of deionized water in turn, and stir the above mixture fully with a magnetic stirrer at 10°C. After TEMPO and NaBr are completely dissolved, add 2 g of pulverized bleached wood pulp fiber powder to the reaction system; (2) stir vigorously until the cellulose is evenly dispersed, then add 20 g of NaClO to the system, and add 0.5 mol L -1 NaOH solution to control the pH of the reaction system at about 10; (3) filter the oxidized cellulose after reacting for 6 hours, and wash with deionized water for 3 to 5 times to obtain oxidized cellulose; (4) use deionized water to filter the oxidized cellulose Supplemented into 2mg ml -1 In an ice-water bath, oxidized cellulose was peeled off into cellulose nanofibers by ultrasonication at 300W power for 5 minutes, and the prepared fiber nanofiber suspension was stored in...

Embodiment 3

[0077] Step 1, the preparation of TEMPO nano-cellulose suspension, its concrete method step comprises:

[0078](1) Weigh 0.033g of TEMPO, and add 0.33g of NaBr into 400mL of deionized water in turn, and stir the above mixture fully with a magnetic stirrer at 10°C. After TEMPO and NaBr are completely dissolved, add 2 g of pulverized bleached wood pulp fiber powder to the reaction system; (2) stir vigorously until the cellulose is evenly dispersed, then add 21 g of NaClO to the system, and add 0.5 mol L -1 NaOH solution to control the pH of the reaction system at about 10; (3) filter the oxidized cellulose after reacting for 6 hours, and wash with deionized water for 3 to 5 times to obtain oxidized cellulose; (4) use deionized water to filter the oxidized cellulose Supplemented into 2mg ml -1 In an ice-water bath, oxidized cellulose was peeled off into cellulose nanofibers by ultrasonication at 300W power for 5 minutes, and the prepared fiber nanofiber suspension was stored in ...

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Abstract

The invention discloses a preparation method and application method of TEMPO nanocellulose-polyacrylic acid gel. The preparation method comprises the following steps: a. preparing TEMPO nanocellulose suspension; b. preparing carbon nanomaterial dispersion; c. TEMPO The nanocellulose suspension is mixed with the carbon nanomaterial dispersion, added to the polyacrylic acid aqueous solution, added with a crosslinking agent, and stirred until a gel is formed to obtain a carbon nanotube-TEMPO nanocellulose-polyacrylic acid gel. The present invention introduces the concept of biology into polymer materials to form an intelligent material with self-healing properties, prolongs the service life of the material, and restores and retains its original characteristics. And in some applications, it can avoid damage caused by the accumulation of cracks and improve the safety of materials.

Description

technical field [0001] The invention belongs to the field of polymer composite conductive materials, and in particular relates to a preparation method and application method of TEMPO nanocellulose-polyacrylic acid gel. Background technique [0002] Polyacrylic acid (PAA) is a water-soluble organic polymer, which is widely used in the preparation of biomedical materials such as hydrogels due to its good mechanical properties and biocompatibility. The series of hydrogels developed with it have been widely used in adsorbents, water-absorbing and water-retaining agents, antipyretic patches, drug release, and compounded into intelligent hydrogels. Among them, the hydrogel prepared by PAA has self-healing properties. In order to improve the mechanical properties, healing ability and expand the application field of PAA hydrogel, PAA hydrogel is often compounded with other materials. PAA hydrogel is added with TEMPO (2,2,6,6-tetramethylpiperidinium oxide) nanocellulose to enhance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08L1/04C08L33/02C08K3/04
Inventor 韩景泉郑春晓陆凯悦岳一莹徐信武梅长彤朱赛玲
Owner NANJING FORESTRY UNIV
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