Nano fiber composite hydrogel with conductivity toned along with temperature and preparation method and application of nano fiber composite hydrogel

A technology of composite hydrogels and nanofibers, which is applied in the directions of thermometers, thermometers, and electrical devices using electrical/magnetic components directly sensitive to heat, can solve the problem of reducing the mechanical strength, electrical conductivity, and electrical conductivity of smart hydrogels. Inability to control, particle precipitation and poor interfacial compatibility, etc., to achieve the effect of good electrochemical activity, good biocompatibility, and good mechanical properties

Active Publication Date: 2018-10-16
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Nano fiber composite hydrogel with conductivity toned along with temperature and preparation method and application of nano fiber composite hydrogel
  • Nano fiber composite hydrogel with conductivity toned along with temperature and preparation method and application of nano fiber composite hydrogel
  • Nano fiber composite hydrogel with conductivity toned along with temperature and preparation method and application of nano fiber composite hydrogel

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Experimental program
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Effect test

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 nano fiber composite hydrogel with conductivity toned along with temperatures. The nano fiber composite hydrogel is prepared by heating and polymerizing at least 5-10 mass parts of 2-methyl-2-acrylic acid-2-(2-methoxy-ethyoxyl) ethyl ester, 5-10 mass parts of methoxy-polyethylene glycol methyl acrylate and 0.5-8 mass parts of nano cellulose colloid and by further polymerizing with 0.1-2 mass parts of conductive macromolecule monomer. According to the nano fiber composite hydrogel, a conductive macromolecule polymer is synthesized on a nano fiber reinforced thermo-sensitive type hydrogel substrate, meanwhile, the nano fiber composite hydrogel has good temperature sensitivity and excellent conductivity, and the conductivity of the nano fiber composite hydrogel can change along with temperature change; in addition, due to the introduction of a nano fiber and rigid conductive macromolecules, the mechanical strength of the hdyrogel can be improved; in addition, because of variable shapes and sizes of the hdyrogel, application requirements of multiple situations can be met, and the hdyrogel has wide application prospects in fields such as flexible intelligent materials and muscle bionics.

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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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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