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Chitosan/poly(acrylamide-acrylic acid)-Al3+ ionized hydrogel as well as preparation method and application thereof

A technology of acrylamide and chitosan, which is applied in application, diagnostic recording/measurement, diagnosis, etc., can solve the problems of insufficient strength, poor self-healing and fatigue resistance, and achieve good fatigue resistance, mechanical performance improvement, fast The effect of fully self-healing properties

Pending Publication Date: 2020-06-12
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hydrogel of the present invention has characteristics such as transparency, high stretchability, high strength, complete self-recovery, fatigue resistance and ultra-sensitivity, so the sensing device prepared by using the ionic hydrogel of the present invention has stretchability, transparency and sensitivity, etc., which solve the technical problems of insufficient strength, poor self-recovery and fatigue resistance of existing ionic hydrogel sensing devices

Method used

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  • Chitosan/poly(acrylamide-acrylic acid)-Al3+ ionized hydrogel as well as preparation method and application thereof
  • Chitosan/poly(acrylamide-acrylic acid)-Al3+ ionized hydrogel as well as preparation method and application thereof
  • Chitosan/poly(acrylamide-acrylic acid)-Al3+ ionized hydrogel as well as preparation method and application thereof

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Experimental program
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Embodiment 1

[0041] Chitosan / poly(acrylamide-acrylic acid)-Al of the present embodiment 3+ (CPA) The preparation method of ionic hydrogel, comprises the steps:

[0042] (1) Add 0.3g chitosan (CS) to 10mL, Al 3+ AlCl with a concentration of 0.075mol / L 3 aqueous solution, and then the resulting mixture was continuously stirred at 90 °C for 90 min to ensure one-step dissolution and crosslinking of CS to form Al 3+ / CS complex solution.

[0043] (2) the Al obtained in step (1) 3+ / CS complex solution was cooled to 60°C, then acrylamide, acrylic acid and 0.04g of 2-hydroxy-2-methylacetophenone were added to the above solution in turn, and stirred at 60°C until all reactants were dissolved to obtain a mixed solution; wherein: the concentration of the acrylamide in the mixed solution is 4mol / L; the concentration of the acrylic acid in the mixed solution is 0.2mol / L.

[0044] (3) Finally, inject the mixed solution obtained in step (2) into a transparent mold, and polymerize for 1 h under an u...

Embodiment 2

[0046] Chitosan / poly(acrylamide-acrylic acid)-Al of the present embodiment 3+ (CPA) The preparation method of ionic hydrogel, comprises the steps:

[0047] (1) Add 0.2g chitosan (CS) to 10mL, Al 3+ AlCl with a concentration of 0.1mol / L 3 aqueous solution, and then the resulting mixture was continuously stirred at 80 °C for 120 min to ensure one-step dissolution and crosslinking of CS to form Al 3+ / CS complex solution.

[0048] (2) the Al obtained in step (1) 3+ / CS complex solution was cooled to 40°C, then acrylamide, acrylic acid and 0.04g of 2-hydroxy-2-methylacetophenone were added to the above solution in turn, and stirred at 40°C until all reactants were dissolved to obtain a mixed solution; wherein: the concentration of the acrylamide in the mixed solution is 3mol / L; the concentration of the acrylic acid in the mixed solution is 0.6mol / L.

[0049] (3) Finally, inject the mixed solution obtained in step (2) into a transparent mold, and polymerize for 1 h under an ul...

Embodiment 3

[0051] Chitosan / poly(acrylamide-acrylic acid)-Al of the present embodiment 3+ (CPA) The preparation method of ionic hydrogel, comprises the steps:

[0052] (1) Add 0.5g chitosan (CS) to 10mL, Al 3+ AlCl with a concentration of 0.125mol / L 3 aqueous solution, and then the resulting mixture was continuously stirred at 100 °C for 180 min to ensure one-step dissolution and crosslinking of CS to form Al 3+ / CS complex solution.

[0053] (2) the Al obtained in step (1) 3+ / CS complex solution was cooled to 40°C, then acrylamide, acrylic acid and 0.06g of 2-hydroxy-2-methylacetophenone were added to the above solution in sequence, and stirred at 40°C until all reactants were dissolved to obtain a mixed solution; wherein: the concentration of the acrylamide in the mixed solution is 3mol / L; the concentration of the acrylic acid in the mixed solution is 0.3mol / L.

[0054] (3) Finally, the mixed solution obtained in step (2) was injected into a transparent mold, and polymerized under...

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Abstract

The invention relates to chitosan / poly(acrylamide-acrylic acid)-Al3+ ion hydrogel which is transparent, highly telescopic, high in strength, completely self-recovery, anti-fatigue and ultra-sensitive,a preparation method of the chitosan / poly(acrylamide-acrylic acid)-Al3+ ion hydrogel and application of the chitosan / poly(acrylamide-acrylic acid)-Al3+ ion hydrogel in strain sensing equipment. According to the preparation method, one-step dissolution and crosslinking of CS are realized by an AlCl3 solution at a high temperature, so that an Al3+-CS complex is formed. Then, the complex is introduced into a poly(acrylamide-acrylic acid) copolymer composite system as a primary cross-linked network, and then another physical cross-linked network is further constructed through ionic bonds formed between carboxyl on a copolymer chain and Al3+, so that the ionized hydrogel is obtained. The prepared ionized water gel has the characteristics of transparency, high scalability, high strength, complete self-recovery, fatigue resistance, ultra-sensitivity and the like, a sensor prepared from the hydrogel integrates required key performances, and the ionized water gel can be used for wearable equipment to effectively monitor the movement of each part of a human body.

Description

technical field [0001] The invention belongs to the technical field of intelligent materials, and in particular relates to a transparent, highly scalable, high-strength, fully self-healing, fatigue-resistant and ultra-sensitive chitosan / poly(acrylamide-acrylic acid)-Al 3+ Ionic hydrogels and their preparation methods and applications in strain sensing devices. Background technique [0002] In the past decades, flexible smart sensing devices have shown an explosive growth trend due to their numerous applications in numerous fields such as medical monitoring, human-machine interface, and soft robotics. At the same time, these huge advances have correspondingly put forward higher requirements for sensor equipment. Ideal next-generation "smart" sensor devices, especially visually interactive sensor devices, are characterized by a combination of transparency, sensitivity, and mechanical properties (e.g., stretchability, strength, self-healing, and fatigue resistance). Therefore...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L5/08C08L33/26C08K3/16C08F220/56C08F220/06C08F2/48A61B5/11
CPCC08J3/075C08F220/56C08F2/48A61B5/1123A61B5/11C08J2305/08C08J2333/26C08F220/06
Inventor 张玉红潘申鑫夏蒙詹园何培新
Owner HUBEI UNIV
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