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A nanofiber composite hydrogel whose electrical conductivity is tuned with temperature, its preparation method and application

A composite hydrogel and nanofiber technology, which is applied in the direction of thermometers, thermometers, and electrical devices that are directly sensitive to heat/magnetic elements, can solve the problem of reducing the mechanical strength, electrical conductivity, and electrical conductivity of smart hydrogels Unable to control, particle precipitation and poor interfacial compatibility, etc., to achieve good electrochemical activity, good biocompatibility, and good mechanical properties

Active Publication Date: 2021-01-26
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unavoidable problems such as particle precipitation and poor interfacial compatibility brought about by this method greatly reduce the mechanical strength and electrical conductivity of this smart hydrogel.
In addition, the traditional conductive hydrogel has the disadvantage that the conductivity cannot be adjusted, and it is difficult to apply it in a smart and changeable system.

Method used

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  • A nanofiber composite hydrogel whose electrical conductivity is tuned with temperature, its preparation method and application
  • A nanofiber composite hydrogel whose electrical conductivity is tuned with temperature, its preparation method and application
  • A nanofiber composite hydrogel whose electrical conductivity is tuned with temperature, its preparation method and application

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Embodiment 1

[0035] The preparation method of the nanofiber composite hydrogel of the present embodiment comprises the following steps:

[0036] (1) Get bleached lignocellulose powder 5g, add 100g concentration and be that the concentrated sulfuric acid of 48wt% is hydrolyzed in 45 ℃ of water baths 2h, stir at 200rpm with mechanical stirring paddle simultaneously, add a large amount of ultrapure waters to terminate reaction after hydrolysis finishes, To obtain nano-cellulose colloid, the cellulose mixed solution obtained after sulfuric acid hydrolysis was left to settle, the upper liquid was removed and the precipitate was washed to neutrality, and the nano-cellulose colloid was obtained by high-pressure homogeneous circulation and shearing for 25 times;

[0037] (2) adjust the mass fraction of nanocellulose in the nanocellulose colloid to be 0.5%, get the nanocellulose colloid obtained after the step (1) of 6g, and 9g 2-methyl-2-acrylic acid-2-(2 -Methoxyethoxy) ethyl ester and 6g methoxy...

Embodiment 2

[0040] The preparation method of the nanofiber composite hydrogel of the present embodiment comprises the following steps:

[0041] (1) Take 5 g of bleached wood cellulose powder, add 100 g of concentrated sulfuric acid with a concentration of 48 wt%, and hydrolyze it in a water bath at 45° C. for 1.5 h, while stirring with a mechanical stirring paddle at 200 rpm. After the hydrolysis, add a large amount of ultrapure water to terminate the reaction , to obtain nano-cellulose colloid, the cellulose mixed solution obtained after sulfuric acid hydrolysis was left to settle, the upper liquid was removed and the precipitate was washed to neutrality, and the nano-cellulose colloid was obtained by high-pressure homogeneous circulation and shearing 15 times;

[0042] (2) adjust the massfraction of nanocellulose in the nanocellulose colloid to be 1%, get the nanocellulose colloid obtained after the step (1) of 6g, and 8g 2-methyl-2-acrylic acid-2-(2 -Methoxyethoxy) ethyl ester and 7g m...

Embodiment 3

[0045] The preparation method of the nanofiber composite hydrogel of the present embodiment comprises the following steps:

[0046] (1) Take 5 g of bleached wood cellulose powder, add 100 g of concentrated sulfuric acid with a concentration of 48 wt%, and hydrolyze it in a water bath at 45° C. for 1.5 h, while stirring with a mechanical stirring paddle at 200 rpm. After the hydrolysis, add a large amount of ultrapure water to terminate the reaction , to obtain nano-cellulose colloid, the cellulose mixed solution obtained after sulfuric acid hydrolysis was left to settle, the upper liquid was removed and the precipitate was washed to neutrality, and the nano-cellulose colloid was obtained by high-pressure homogeneous circulation and shearing 20 times;

[0047] (2) adjusting the mass fraction of nanocellulose in the nanocellulose colloid to be 1.5%, get the nanocellulose colloid obtained after the step (1) of 6g, and 10g 2-methyl-2-acrylic acid-2-(2 -Methoxyethoxy) ethyl ester a...

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Abstract

The invention discloses a nanofiber composite hydrogel whose electrical conductivity is tuned with temperature, which comprises at least 5-10 parts by mass of 2-methyl-2-acrylic acid-2-(2-methoxyethoxy) ethyl ester 5-10 parts by mass of methoxypolyethylene glycol methacrylate and 0.5-8 parts by mass of nano-cellulose colloid are heated and polymerized, and then polymerized with 0.1-2 parts by mass of conductive polymer monomer. The nanofiber composite hydrogel synthesizes a conductive polymer on a nanofiber-reinforced temperature-sensitive hydrogel matrix. It also has sensitive temperature-sensitive properties and excellent electrical conductivity, and its electrical conductivity can change with temperature. Moreover, due to the introduction of nanofibers and rigid conductive polymers, the mechanical strength of the hydrogel is increased; in addition, the variable shape and size of the hydrogel can meet the application requirements of many occasions. In the fields of flexible smart materials, muscle bionics, etc. with broadly application foreground.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and in particular relates to a nanofiber composite hydrogel whose electrical conductivity is tuned with temperature, a preparation method and application thereof. Background technique [0002] Hydrogel has strong water absorption and water retention, and has a wide range of applications in tissue engineering, agricultural production, food preservation, wound dressing and many other aspects. However, due to the poor mechanical strength of traditional hydrogels, their practical applications are limited. In recent years, smart hydrogels with high performance and stimuli responsiveness have gradually attracted the attention of scientists. As a new type of smart material, conductive hydrogel not only has the three-dimensional network structure of traditional hydrogel, but also has excellent electrical properties, and plays a huge role in supercapacitors, electrochemical components, nerve elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08B15/02C08F251/02C08F220/28C08G73/02C08G73/06G01K7/16
CPCG01K7/16C08B15/02C08F251/02C08G73/0266C08G73/0611C08J3/075C08J2351/02C08J2479/02C08J2479/04C08F220/282C08F220/286
Inventor 吴义强卿彦刘柳乔建政罗莎田翠花胡非羽
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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