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A double-layer hydrogel bionic hand and its preparation method

A hydrogel bionic hand and hydrogel technology are applied in the field of biomimetic smart materials, which can solve the problems of low mechanical strength, restricting the application of hydrogel, complicated preparation process, etc., and achieve the effect of excellent mechanical strength.

Active Publication Date: 2018-04-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently reported bilayer hydrogel actuators are generally prepared by first preparing the first layer of hydrogel, and then preparing the second layer of hydrogel on the surface of the first layer of hydrogel to obtain a bilayer hydrogel. (J. Mater. Chem. A, 2014, 2, 15633; ACS Appl. Mater. Interfaces, 2015, 7, 1758), the preparation process is relatively complicated, and the interaction between the two layers is weak
At the same time, due to the large amount of water contained in traditional hydrogels, the mechanical strength is very low, and they cannot withstand large stretching, compression or repeated deformation, which greatly restricts the application of hydrogels in the field of actuators.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Disperse 0.05 g of artificial hectorite in 10 mL of deoxygenated deionized water at room temperature, then add 3 g of acrylic acid monomer, 0.015 g of initiator potassium persulfate, and 0.0003 g of chemical cross-linking agent N , N' - methylenebisacrylamide, stirring to obtain a uniform dispersion, passing argon gas into the dispersion to remove oxygen therein, and finally adding the reaction solution to the mold and sealing it, and reacting for 2 hours in an environment of 50 ° C to obtain The first layer of polyacrylic acid hydrogel has a tensile breaking strength of 70 kPa; the obtained polyacrylic acid hydrogel is soaked in 0.01 mol / L ferric chloride / 0.05 mol / L hydrochloric acid solution for 0.5 hours to obtain the second layer Fe 3+ The cross-linked polyacrylic acid hydrogel has a tensile breaking strength of 1000 kPa; two layers of hydrogel can be pasted together to obtain a tightly bonded double-layer hydrogel, and the bond between the two layers of hydrogel ...

Embodiment 2

[0029] Disperse 0.1 g of artificial hectorite in 10 mL of deoxygenated deionized water at room temperature, then add 4 g of acrylic acid monomer, 0.06 g of initiator potassium persulfate, and 0.002 g of chemical crosslinker N , N' - methylenebisacrylamide, stirring to obtain a uniform dispersion, passing argon gas into the dispersion to remove the oxygen therein, finally adding the reaction solution to the mold and sealing it, and reacting in an environment of 60 °C for 4 hours to obtain The first layer of polyacrylic acid hydrogel has a tensile breaking strength of 120 kPa; the obtained polyacrylic acid hydrogel is soaked in 0.09 mol / L ferric chloride / 0.45 mol / L hydrochloric acid solution for 2 hours to obtain the second layer Fe 3+ The cross-linked polyacrylic acid hydrogel has a tensile breaking strength of 1800 kPa; two layers of hydrogel can be pasted together to obtain a tightly bonded double-layer hydrogel, and the bond between the two layers of hydrogel The strength ...

Embodiment 3

[0031]Disperse 0.2 g of artificial hectorite in 10 mL of deoxygenated deionized water at room temperature, then add 5 g of acrylic acid monomer, 0.05 g of initiator potassium persulfate, and 0.001 g of chemical cross-linking agent N , N' - methylenebisacrylamide, stirring to obtain a uniform dispersion, passing argon into the dispersion to remove the oxygen therein, and finally adding the reaction solution to the mold and sealing it, and placing it in an environment of 70 °C for 6 hours to obtain The first layer of polyacrylic acid hydrogel has a tensile breaking strength of 240 kPa; the obtained polyacrylic acid hydrogel is soaked in 0.02 mol / L ferric chloride / 0.1 mol / L hydrochloric acid solution for 5 hours to obtain the second layer Fe 3+ The cross-linked polyacrylic acid hydrogel has a tensile breaking strength of 4000 kPa; two layers of hydrogel can be pasted together to obtain a tightly bonded double-layer hydrogel, and the bond between the two layers of hydrogel The s...

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Abstract

The invention discloses a double-layer hydrogel bionic hand and a preparation method thereof. The double-layer hydrogel bionic hand is formed by bonding a layer of polyacrylic acid hydrogel with pH responsiveness and viscidity and a layer of Fe<3+> cross-linked polyacrylic acid hydrogel through the viscous effect; the double-layer hydrogel bionic hand can be similar to a human hand to achieve bionic actions of hand closing and opening through a method of changing the pH values and ionic strengths of solutions in the solutions with the different pH values, and the effects of grabbing and releasing objects are achieved.

Description

technical field [0001] The invention relates to the field of bionic intelligent materials of functional polymer-inorganic nanoparticle hybrid materials, in particular to a double-layer hydrogel bionic hand and a preparation method thereof. Background technique [0002] Because hydrogel contains a large amount of water and has the characteristics of soft matter given by its perfect three-dimensional network structure, it has the advantages of weak stimulation-strong response, less addition-big effect, mild driving conditions, etc.; and soft matter drives especially hydrogels. The development of glue actuators in the field of smart devices has received increasing attention. The unique structure and intelligent responsiveness of organisms to external stimuli have important inspiration and guidance for the development and design of new actuator materials. Apply the structure and characteristics of organisms to the design and development of new materials, that is, in a biomimetic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B27/18B32B27/32C08F220/06C08F222/38C08F2/44C08K3/34C08J3/24C08J3/075
CPCB32B27/08B32B27/18B32B27/32B32B2250/02B32B2250/242C08F2/44C08F220/06C08J3/075C08J3/24C08J2333/02C08K3/34C08F222/385
Inventor 王涛赵雷黄家和孙尉翔童真
Owner SOUTH CHINA UNIV OF TECH
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