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Preparation method for sodium alginate-acrylamide-based hydrogel

A technology of polyacrylamide and sodium alginate, which is applied in the field of polymer materials, can solve the problems of low tensile strength of high-strength hydrogels and low toughness of high-strength double-network hydrogels, and achieve experimental repeatability Strong, easy to operate, broad application prospects

Inactive Publication Date: 2015-07-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of the above two technologies have certain defects. The high-strength double-network hydrogel prepared by Gong J P et al. has low toughness, and the high-stretch hydrogel synthesized by Suo Z G et al. has relatively low tensile strength.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] This embodiment includes the following steps:

[0017] Step 1: Dissolve sodium alginate powder in deionized water in a water bath at 25°C, then add acrylamide monomer, methylenebisacrylamide, ammonium persulfate and N,N,N',N'-tetra Methylethylenediamine, stirred evenly, deionized water accounts for 80% of the total solution mass after mixing; the mass ratio of sodium alginate powder to acrylamide monomer is 1:7.5, and the mass ratio of methylenebisacrylamide to acrylamide monomer The mass ratio is 0.06%, the mass ratio of ammonium persulfate to acrylamide monomer is 0.1%, and the mass ratio of N,N,N',N'-tetramethylethylenediamine to acrylamide monomer is 0.25%; After the prepared solution was left to stand at room temperature for 2 hours, it was poured into a glass mold and heated at 50°C for 3 hours. During this process, the acrylamide monomer was cross-linked into a hydrogel, and the sodium alginate did not cross Linked, but throughout the polyacrylamide hydrogel net...

Embodiment 2

[0021] This embodiment includes the following steps:

[0022] Step 1: Dissolve sodium alginate powder in deionized water in a water bath at 35°C, then add acrylamide monomer, methylene bisacrylamide, ammonium persulfate and N,N,N',N'-tetra Methylethylenediamine, stirred evenly, deionized water accounts for 86% of the total solution mass after mixing; the mass ratio of sodium alginate powder to acrylamide monomer is 1:8, and the mass ratio of methylenebisacrylamide to acrylamide monomer The mass ratio is 0.06%, the mass ratio of ammonium persulfate to acrylamide monomer is 0.1%, and the mass ratio of N,N,N',N'-tetramethylethylenediamine to acrylamide monomer is 0.25%; After the prepared mixture was left to stand at room temperature for 3 hours, it was poured into a glass mold and heated at 50°C for 3 hours. During this process, the acrylamide monomer was crosslinked into a hydrogel, and sodium alginate did not crosslink. Linked, but throughout the polyacrylamide hydrogel netwo...

Embodiment 3

[0026] This embodiment includes the following steps:

[0027] Step 1: Dissolve sodium alginate powder in deionized water in a water bath at 50°C, and then add acrylamide monomer, methylene bisacrylamide, ammonium persulfate and N,N,N',N'-tetra Methylethylenediamine, stirred evenly, deionized water accounts for 88% of the total solution mass after mixing; the mass ratio of sodium alginate powder to acrylamide monomer is 1:9, and the mass ratio of methylenebisacrylamide to acrylamide monomer The mass ratio is 0.06%, the mass ratio of ammonium persulfate to acrylamide monomer is 0.1%, and the mass ratio of N,N,N',N'-tetramethylethylenediamine to acrylamide monomer is 0.25%; After the prepared mixture was left to stand at room temperature for 2 hours, it was poured into a glass mold and heated at 50°C for 3 hours. During this process, the acrylamide monomer was cross-linked into a hydrogel, and sodium alginate did not cross-link Linked, but throughout the polyacrylamide hydrogel ...

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Abstract

The invention discloses a preparation method for sodium alginate-acrylamide-based hydrogel. The preparation method comprises the following steps of: dissolving sodium alginate powder in deionized water; then sequentially adding an acrylamide monomer, a methylene diacrylamide cross-linking agent, ammonium persulfate and an N,N,N',N'-tetramethylethylenediamine catalyst; uniformly stirring the materials, pouring the mixture into a glass die, and heating the mixture to obtain a hydrogel; completely soaking the hydrogel in a 0.01-1 mol / L non-monovalent cation aqueous solution for 1-10 hours, wherein cations diffuse and enter in a hydrogel network structure, and induce sodium alginate to cross-link, so as to generate the high-strength and high-toughness sodium alginate-acrylamide-based hydrogel during the process. The hydrogel disclosed by the invention has the following performances: the highest tensile strength can achieve 1 MPa, and the highest tensile elasticity modulus can achieve 250 KPa; a loading-unloading test is performed on the hydrogel, and when the great tensile multiple before unloading is 8, the highest dissipated energy can achieve 2180 KJ / m<3>.

Description

technical field [0001] The invention belongs to the technical category of polymer materials, and specifically relates to a preparation method based on sodium alginate-polyacrylamide hydrogel. technical background [0002] Hydrogel is a kind of "soft and wet" functional polymer material containing more than 90% water in its three-dimensional polymer network structure. However, due to the low mechanical properties of most hydrogels, their application range is severely restricted. Usually the fracture energy of traditional hydrogel is about 10J / m 2 , much lower than natural tissue (cartilage about 1000J / m 2 ) and natural rubber (about 10000J / m 2 ) of the fracture energy. Hydrogels with special mechanical properties (such as those with high compressive strength and high tensile properties) have broad application prospects, such as artificial muscles, actuators, sensors, tissue engineering, etc. Therefore, it is of practical significance to design hydrogels with high mechani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08J3/24C08L5/04C08L33/26C08F220/56C08F222/38
Inventor 陈咏梅王美香周进雄杨灿辉
Owner XI AN JIAOTONG UNIV
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