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Preparation method and application of gradient hydrogel soft drive

A hydrogel and actuator technology, applied in the field of preparation of gradient hydrogel soft actuators, can solve the problems of lack of "smart" response performance, interface defects of double-layer structure hydrogel soft actuators, etc.

Active Publication Date: 2019-12-10
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] One of the purposes of the present invention is to provide a method for preparing a gradient hydrogel soft actuator, which can solve the problem of lack of "smart" response performance in existing conventional hydrogels, and at the same time avoid the problem of interface defects in double-layer structure hydrogel soft actuators

Method used

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  • Preparation method and application of gradient hydrogel soft drive
  • Preparation method and application of gradient hydrogel soft drive
  • Preparation method and application of gradient hydrogel soft drive

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Experimental program
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Effect test

Embodiment 1

[0033] 0.565g NIPAM monomer, 1.468g TCNCs suspension (0.77wt%), 0.5g initiator KPS solution (1.08wt%), 0.25g crosslinker BIS solution (0.75wt%), 3μL Accelerator TEMED is mixed, and deionized water is added until the total mass of the mixed solution is 5 g. The mixture was vortexed for 3 minutes, then ultrasonicated in an ice-water bath for 5 minutes to obtain a uniformly dispersed mixture, and then vacuumed for 5 minutes. Pour the mixed solution into a conductive mold, apply a DC electric field, the electric field strength is 1V / mm, and the induction time is 30min, then place the mold at 20°C to initiate polymerization / crosslinking, take it out after 24h and immerse it in deionized water to remove unreacted of small molecules. The sample is named E 1 T 2 t 30 .

Embodiment 23

[0035] 0.565g NIPAM monomer, 1.468g TCNCs suspension (0.77wt%), 0.5g initiator KPS solution (1.08wt%), 0.25g crosslinker BIS solution (0.75wt%), 3μL Accelerator TEMED is mixed, and deionized water is added until the total mass of the mixed solution is 5 g. The mixture was vortexed for 3 minutes, then ultrasonicated in an ice-water bath for 5 minutes to obtain a uniformly dispersed mixture, and then vacuumed for 5 minutes. Pour the mixed solution into a conductive mold, apply a DC electric field, the electric field strength is 1V / mm, and the induction time is 60min, then place the mold at 20°C to initiate polymerization / crosslinking, take it out after 24h and immerse it in deionized water to remove unreacted of small molecules. The sample is named E 1 T 2 t 60 .

Embodiment 3

[0037] 0.565g NIPAM monomer, 1.468g TCNCs suspension (0.77wt%), 0.5g initiator KPS solution (1.08wt%), 0.25g crosslinker BIS solution (0.75wt%), 3μL Accelerator TEMED is mixed, and deionized water is added until the total mass of the mixed solution is 5 g. The mixture was vortexed for 3 minutes, then ultrasonicated in an ice-water bath for 5 minutes to obtain a uniformly dispersed mixture, and then vacuumed for 5 minutes. Pour the mixed solution into a conductive mold, apply a DC electric field, the electric field strength is 2V / mm, and the induction time is 30min, then place the mold at 20°C to initiate polymerization / crosslinking, take it out after 24h and immerse it in deionized water to remove unreacted of small molecules. The sample is named E 2 T 2 t 30 .

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Abstract

The invention relates to the technical field of composite materials and polymer functional materials, in particular to a preparation method and application of a gradient hydrogel soft drive. The preparation method of the gradient hydrogel soft drive comprises the steps that a certain amount of negatively-charged ascidian cellulose nanocrystals, N-isopropenyl acrylamide, an auxiliary and water areevenly mixed at the certain temperature, and thus a mixed solution is obtained; and the mixed solution is induced through a direct current electric field, and then in-situ thermal-initiation polymerization is conducted to prepare the gradient hydrogel soft drive. The gradient hydrogel soft drive is prepared from the ascidian cellulose nanocrystals and the poly N-isopropenyl acrylamide in a compounded mode; the negatively-charged ascidian cellulose nanocrystals are subjected to electric field force and thus move to form the gradient concentration, and finally, in-situ initiation polymerizationis conducted to form the hydrogel soft drive of a gradient cross-linking structure; and the hydrogel soft drive has the controllable temperature-sensitive bending rate and fatigue resistance.

Description

technical field [0001] The invention relates to the technical field of composite materials and polymer functional materials, in particular to a preparation method and application of a gradient hydrogel soft actuator. [0002] technical background [0003] Hydrogel is a three-dimensional network structure material formed by the cross-linking of hydrophilic polymer chains. It has a wide range of applications in life and production, such as sensors, tissue engineering, drug carriers, and actuators. However, with the promotion of hydrogels in these applications, the performance of traditional hydrogels can no longer meet the requirements of these applications, so "smart" hydrogels came into being. "Smart" hydrogels have heterogeneous structures, which can produce anisotropic responses to environmental changes in light, electricity, magnetism, pH, temperature, etc. For example, poly-N-isopropylacrylamide hydrogel with heterogeneous cross-linked structure exhibits hydrophilic swel...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L33/24C08L1/04C08F220/54C08F222/38
CPCC08F220/54C08J3/075C08J2333/24C08J2401/04C08F222/385
Inventor 常春雨莫康伟张俐娜
Owner WUHAN UNIV
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