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Preparation method and application of shape memory hydrogel

A technology of hydrogel and cross-linked hydrogel, which is applied in the direction of manufacturing tools, program-controlled manipulators, manipulators, etc., to achieve the effects of fast deformation speed, high energy density, ultra-high elongation at break and toughness

Active Publication Date: 2021-06-11
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Introduced by researchers at MIT (Ministryof Technology Laboratory) on how well an organism's body works with hydrogels made from materials called gelatin or polyacrylamide. These gels have unique properties that make them ideal tools used during medical procedures such as surgery and biomedical engineering. They are easy to use because they don’t require any specialized training beforehand.

Problems solved by technology

The technical problem addressed in this patents relates to developing artificial muscle structures with improved retractile capabilities while also being able to be easily folded into smaller spaces without losing its strength over time. This would make possible applications where hydrogels could replace traditional metal rods foundational material (metal) in robot joint systems.

Method used

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  • Preparation method and application of shape memory hydrogel
  • Preparation method and application of shape memory hydrogel
  • Preparation method and application of shape memory hydrogel

Examples

Experimental program
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Embodiment 1

[0028] A monocrosslinked hydrogel was prepared by dissolving acrylic acid, acrylamide and acrylamide adamantane in the aqueous dispersion of cyclodextrin-grafted ascidian cellulose nanocrystals. The hydrogel is stretched by 1600% stretching ratio, 469 turns / m twisting density twisting and counterclockwise helical winding on the 3mm pipe, soaked in ferric chloride solution to obtain the hydrogel muscle. Its shrinkage rate in ethanol is -13.7% / s, the shrinkage strain is -65%, and the maximum energy density is 1.6J / kg.

Embodiment 2

[0030] A monocrosslinked hydrogel was prepared by dissolving acrylic acid, acrylamide and acrylamide adamantane in the aqueous dispersion of cyclodextrin-grafted ascidian cellulose nanocrystals. The hydrogel is stretched by 1600% stretching ratio, 469turns / m twisting density twisting and clockwise helical winding on the 3mm pipe, soaked in ferric chloride solution to obtain the hydrogel muscle. Its shrinkage rate in ethanol is 17.9% / s, the shrinkage strain is 473%, and the maximum energy density is 11.8J / kg.

Embodiment 3

[0032] A monocrosslinked hydrogel was prepared by dissolving acrylic acid, acrylamide and acrylamide adamantane in the aqueous dispersion of cyclodextrin-grafted ascidian cellulose nanocrystals. The hydrogel is stretched by 1600% stretching ratio, 469turns / m twisting density twisting and clockwise helical winding on the 3mm pipe, soaked in ferric chloride solution to obtain the hydrogel muscle. After the hydrogel was elongated and fixed to the hydrogel temporary shape in ethanol, its shrinkage strain in water was determined to be -87%, and the maximum energy density was 42.4 J / kg.

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Abstract

A preparation method of shape memory hydrogel comprises the following steps: step 1, dissolving acrylamide, acrylic acid and acrylamide adamantane in a cyclodextrin-grafted sea squirt cellulose nanocrystal aqueous dispersion according to a certain proportion, incubating at the temperature of 55 DEG C for 2 hours, cooling in an ice-water bath, adding an initiator ammonium persulfate, injecting the dispersion liquid into a mold, and polymerizing at the temperature of 55 DEG C for 5 hours, so as to obtain the mono-crosslinked hydrogel; step 2, carrying out a series of continuous orientation operations on the mono-crosslinked hydrogel obtained in the step 1 to obtain spiral hydrogel; and step 3, soaking the spiral hydrogel obtained in the step 2 in a stationary liquid for 24 hours to obtain the shape memory hydrogel. The invention further discloses an application of the shape memory hydrogel. The prepared hydrogel is applied to a micro-engine and artificial muscle of an automobile model.

Description

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Claims

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Application Information

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Owner WUHAN UNIV
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