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Antifreeze polysaccharide composite starch hydrogel, preparation method and application

A polysaccharide composite and hydrogel technology, which is applied in the field of antifreeze hydrogel materials, can solve the problems that the mechanical integrity of the hydrogel cannot be guaranteed, and achieve easy repeatability and mass production, simple methods, and high tensile elongation The effect of rate and conductivity

Active Publication Date: 2019-06-25
EAST CHINA NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Frost-resistant hydrogels have been reported, mainly using antifreeze agents (such as ethylene glycol, glycerin, etc.) to reduce the freezing point of water, inhibit the growth of ice crystals, and realize the antifreeze performance of hydrogels, but antifreeze agents and hydrogels By physical hybridization, the mechanical integrity of the hydrogel cannot be guaranteed

Method used

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  • Antifreeze polysaccharide composite starch hydrogel, preparation method and application
  • Antifreeze polysaccharide composite starch hydrogel, preparation method and application
  • Antifreeze polysaccharide composite starch hydrogel, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Filter the Flammulina velutipes mycelium strainer, wash two to three times with water, collect the precipitate, freeze-dry, and pulverize into powder with a small laboratory grinder; add the Flammulina velutipes mycelium powder to distilled water (quality of mycelial solid powder: distilled water After mass=1:20), extract in a water bath at 100°C for 3 hours, repeat three times, collect the supernatant after centrifugation, concentrate, and precipitate with ethanol. The volume ratio is supernatant: ethanol=1:3. Collect the solid and dry.

[0029] Step 2: Use commercially available sweet potato starch, add it to deionized water, stir at room temperature to form a starch milk with a mass fraction of 10.0%, adjust the pH to 10.0 with 0.1 mol / L NaOH solution, and add NaCl (2.0% of the starch mass) to inhibit Starch granules swell; add 1, 6-hexanediol diglycidyl ether (3.0% of starch quality) and tetrabutylammonium bromide (0.6% of starch quality) to the prepared starch ...

Embodiment 2

[0035] Step 1: Filter the Flammulina velutipes mycelium filter, wash two to three times with water, collect the precipitate, freeze-dry, and pulverize into powder with a small laboratory grinder; add the Flammulina velutipes mycelium powder to distilled water (quality of mycelial solid powder: distilled water Mass=1:30), extract 4h in a water bath at 100℃, repeat three times, collect the supernatant after centrifugation, concentrate, precipitate with ethanol, the volume ratio is supernatant: ethanol=1:5, collect the solid and dry.

[0036] Step 2: Use commercially available glutinous rice starch, add it to deionized water, stir into starch milk with a mass fraction of 20.0% at room temperature, adjust the pH to 12.0 with 0.1 mol / L NaOH solution, and add NaCl (5.0% of the starch mass) to inhibit Starch granules swell; add 1, 6-hexanediol diglycidyl ether (5.0% of starch quality) and tetrabutylammonium bromide (0.7% of starch quality) to the prepared starch milk, and heat to 50 ℃, ...

Embodiment 3

[0043] Step 1: Filter the Flammulina velutipes mycelium filter, wash two to three times with water, collect the precipitate, freeze-dry, and pulverize into powder with a small laboratory pulverizer; add the Flammulina velutipes mycelium powder to distilled water (quality of mycelial solid powder: distilled water Mass=1:50), extract for 2 h in a water bath at 100°C, repeat three times, collect the supernatant after centrifugation, concentrate, and precipitate with ethanol. The volume ratio is supernatant: ethanol=1: 6, collect the solid and dry;

[0044] Step 2: Use commercially available corn starch, add it to deionized water, stir at room temperature into a starch milk with a mass fraction of 10.0%, adjust the pH to 13.0 with 0.1 mol / L NaOH solution, and add NaCl (8.0% of the starch mass) to inhibit Starch granules swell; add 1, 6-hexanediol diglycidyl ether (3.0% of starch quality) and tetrabutylammonium bromide (0.6% of starch quality) to the prepared starch milk, and heat to 5...

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Abstract

The invention discloses an antifreeze polysaccharide composite starch hydrogel, a preparation method and application. Antifreeze polysaccharide and commercial starch are adopted as the matrix, N-isopropylacrylamide (NIPAM) is used as the cross-linking monomer, N' N'-methylene bisacrylamide (MBA) is employed as the cross-linking agent, 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone is taken as the initiator, and photochemical cross-linking is carried out to prepare the hydrogel with tensile properties, and the elongation of the hydrogel reaches 600%. The hydrogel has antifreeze performance, can maintain good flexibility at minus 70DEG C, has strong response to stress stimulation, high reaction sensitivity (0-1 s) and conductivity, and can output stress as an electrical signal, has stretchable resilience, can be applied as a material for preparation of bionic skin and wearable devices in freezing cold environments.

Description

Technical field [0001] The invention relates to the technical field of antifreeze hydrogel materials, in particular to a hydrogel sensor device that responds to stress stimulation in a low temperature environment, and a preparation method and application thereof. Background technique [0002] Stress sensors based on hydrogels are mainly used in bionic skins, wearable devices and bionic robots. However, due to the special water retention properties of hydrogels, such materials can only be used in environments above zero. When the temperature is below zero, condensation The water in the glue freezes and solidifies and loses its stress-sensing properties. In response to this problem, new hydrogel systems need to be developed. [0003] In 2014, KANEKA and others successfully extracted Flammulina velutipes antifreeze polysaccharides for the first time, and proved through experiments that its antifreeze mechanism is mainly to inhibit the growth of ice crystals. Flammulina velutipes pol...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/54C08F2/50C08B37/00
Inventor 张利东宋晓东赵秋华常东民贾彩凤王俊峰张鹏鹏
Owner EAST CHINA NORMAL UNIVERSITY
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