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Starch-based porous hydrogel and preparation method thereof

A hydrogel and starch-based technology is applied in the field of porous hydrogel composed of starch and its preparation, which can solve the problems of three-dimensional structure damage, shrinkage of pore structure, poor porosity, etc., and achieves the maintenance of three-dimensional structure, structural stability, easy effect

Inactive Publication Date: 2014-07-16
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In these methods of preparing porous hydrogels, there are usually some problems: such as the gas volatilization rate is fast, the degree of reaction and the pore structure are often difficult to control; when the solvent volatilizes or phase separation forms pores, the three-dimensional structure of the hydrogel usually changes. When the porous hydrogel is destroyed, the structure, size and shape of the pores are difficult to control, the porosity is poor, and the three-dimensional size of the porous hydrogel usually changes drastically before and after swelling. structure, applications are limited
This method can be processed at room temperature, the conditions are mild, and the method is simple, but when water molecules are exchanged by organic solvents, due to the action of hydrogen bonds between water molecules and the action of polar bonds in the hydrogel structure, the pore structure will seriously occur. shrinkage or collapse

Method used

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  • Starch-based porous hydrogel and preparation method thereof
  • Starch-based porous hydrogel and preparation method thereof
  • Starch-based porous hydrogel and preparation method thereof

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preparation example Construction

[0022] The preparation method of the starch-based porous hydrogel is as follows: adding an initiator, a monomer and a crosslinking agent into the starch solution, and mixing evenly after each component is added, heating to make it fully react, and then obtaining Starch-based hydrogel: after the obtained starch-based hydrogel is washed and swollen, immersed in an organic solvent-water mixed solution for gradient solvent exchange, and dried, the starch-based porous hydrogel can be obtained.

[0023] The starch in the starch solution is soluble starch, cornstarch, carboxymethyl starch, hydroxyethyl starch; the starch solution is: the aqueous solution of starch or the dimethyl sulfoxide solution of starch; the initiator is: Potassium persulfate, ammonium persulfate, azobisisobutyronitrile; the monomer is: at least one of acrylamide, acrylic acid, acrylate and methacrylic acid; the crosslinking agent is: polydimethyl At least one of ethylene glycol acrylate, N,N-methylenebisacrylam...

Embodiment 1

[0030]Add 2.00g of starch and 40mL of distilled water into a round bottom flask, stir well, heat to 85°C to fully gelatinize the starch, and then cool to room temperature. Add 4.00 g of monomer acrylamide, 0.08 g of potassium persulfate, and 1.00 g of cross-linking agent polyethylene glycol dimethacrylate to the starch solution in sequence, and heat for 2.5 h to obtain starch-based hydrogel. The hydrogel is taken out, repeatedly soaked in distilled water, swelled, and washed several times to obtain a pure hydrogel. The swollen hydrogel was sequentially immersed in ethanol-water mixed solutions with volume concentrations of 20%, 40%, 50%, 60%, 65%, 70%, 75%, 80%, and 100%. Shake for 2 hours. Oscillate in 100% ethanol for more than 12 hours, take the hydrogel hardened and no longer elastic as the standard, and then dry it in a drying oven to obtain a starch-based porous hydrogel, such as figure 1 The electron micrograph of the cross-section of the starch-acrylamide porous hyd...

Embodiment 2

[0032] Add 2.00g of starch and 40mL of distilled water into a round bottom flask, stir well, heat to 85°C to fully gelatinize the starch, and then cool to room temperature. 4.00 g of monomer acrylamide and 0.08 g of potassium persulfate were sequentially added to the starch solution, and the temperature was kept at 75°C for 1 hour. Add dilute hydrochloric acid to adjust the pH value of the solution to 1, add 4.00 g of glutaraldehyde as a cross-linking agent, and heat to 50°C for a certain period of time to obtain a starch-based hydrogel. The hydrogel is taken out, repeatedly soaked in distilled water, swelled, and washed several times to obtain a pure hydrogel. The swollen hydrogel was sequentially immersed in ethanol-water mixed solutions with volume concentrations of 20%, 40%, 50%, 60%, 65%, 70%, 75%, 80%, and 100%. Shake for 2 hours. Oscillate in 100% ethanol for more than 12 hours, take the hydrogel hardened and no longer elastic as the standard, and then dry it in a dry...

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Abstract

The invention discloses a starch-based porous hydrogel prepared from a starch liquid, an initiating agent, a monomer and a cross-linking agent. The preparation method comprises the following steps: adding the initiating agent, the monomer and cross-linking agent into the starch liquid; after each component is added, mixing uniformly, and heating for full reaction, thereby obtaining a starch-based hydrogel; and washing and swelling the obtained starch-based hydrogel, immerging the washed and swelled starch-based hydrogel into an organic solvent-water mixed solution with specific components so as to perform gradient solvent exchange, and drying, thereby obtaining the starch-based porous hydrogel. The starch-based porous hydrogel has the characteristics of simple and convenient preparation method, good open pore property, controllable porous structure and stable three-dimensional structure.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a starch-based porous hydrogel and a preparation method thereof. Background technique [0002] Hydrogel is a kind of hydrophilic and water-insoluble polymer, which can rapidly swell to swelling equilibrium in water, and its three-dimensional structure and shape remain unchanged. It has been widely used in the fields of food processing, medicine, and materials. application. Compared with traditional hydrogels, porous hydrogels have a large number of pore structures inside, with larger spaces and larger internal surface areas, so they have better swelling properties, faster swelling kinetics, and more external contact. Features of quick response. [0003] Starch is a renewable natural resource with abundant sources, low price, renewable resources, low toxicity, biocompatibility and biodegradability. However, starch itself has disadvantages such as strong crystallinity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/02C08J9/28C08J3/24C08J3/075C08F251/00
Inventor 楚晖娟魏宏亮朱靖
Owner HENAN UNIVERSITY OF TECHNOLOGY
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