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Preparation method for polyacrylamide-acrylic acid-VDT physical-crosslinking high-strength hydrogel

A polyacrylamide and physical cross-linking technology, applied in the field of polymer materials, can solve the problems of less than 1MPa tensile strength, difficult to stabilize hydrogel properties, low hydrogel strength, etc., and achieves low production cost and high toughness molecules. Adsorption function, the effect of excellent molecular adsorption function

Active Publication Date: 2018-03-20
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of the fully physically crosslinked hydrogel is not high, and the tensile strength is less than 1MPa, so the scope of application is limited.
[0003] Previous studies have shown that the synergistic effect of hydrogen bonds and ionic bonds is a better way to improve the mechanical properties of hydrogel materials, because the formation of appropriate topological structures between different polymers can achieve higher Mechanical properties, which put forward higher requirements on polymer selection and process, and heterogeneous polymers can also easily lead to difficult stability of hydrogel properties

Method used

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  • Preparation method for polyacrylamide-acrylic acid-VDT physical-crosslinking high-strength hydrogel
  • Preparation method for polyacrylamide-acrylic acid-VDT physical-crosslinking high-strength hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Weigh 0.05g of VDT into a three-necked flask, add 5ml of dimethyl sulfoxide, stir and dissolve at room temperature, accounting for 0.85wt% of the total of VDT, acrylic acid, and acrylamide;

[0034] 2) Weigh 0.757g of acrylic acid, 4.975g of acrylamide, and 0.008g of ammonium persulfate in a beaker at room temperature, add 5ml of dimethyl sulfoxide to prepare a mixed solution; the concentration of acrylic acid is 1.05mol / L, and the concentration of propylene The amide concentration is 7.0mol / L, and the concentration of ammonium persulfate is 0.0035mol / L;

[0035] 3) Mix the mixed solution in step 2) and the VDT solution in step 1) in an ice-water bath at 0°C and stir evenly. After one hour, add 50 μL of tetramethylethylenediamine to obtain acrylamide-acrylic acid-VDT mixture solution;

[0036] 4) Pour the acrylamide-acrylic acid-VDT mixed solution obtained in step 3) into a glass mold with a polyester film inside, place it in a hot water bath environment at 40°C, an...

Embodiment 2

[0041] 1) Weigh 0.1g of VDT into a three-necked flask, add 5ml of dimethyl sulfoxide, stir and dissolve at room temperature, accounting for 1.75wt% of the total of VDT, acrylic acid, and acrylamide;

[0042] 2) Weigh 0.324g of acrylic acid, 2.132g of acrylamide, and 0.010g of ammonium persulfate in a beaker at room temperature, add 5ml of dimethyl sulfoxide to prepare a mixed solution; the concentration of acrylic acid is 0.45mol / L, and the concentration of propylene The amide concentration is 5.0mol / L, and the concentration of ammonium persulfate is 0.0044mol / L;

[0043] 3) Mix the mixed solution in step 2) and the VDT solution in step 1) in an ice-water bath at 0°C and stir evenly. After one hour, add 40 μL of tetramethylethylenediamine to obtain acrylamide-acrylic acid-VDT mixture solution;

[0044] 4) Pour the acrylamide-acrylic acid-VDT mixed solution obtained in step 3) into a glass mold with a polyester film inside, place it in a hot water bath environment at 50°C, and...

Embodiment 3

[0049] 1) Weigh 0.2g of VDT into a three-necked flask, add 5ml of dimethyl sulfoxide, stir and dissolve at room temperature, accounting for 3.50wt% of the total of VDT, acrylic acid, and acrylamide;

[0050] 2) Weigh 0.757g of acrylic acid, 4.975g of acrylamide, and 0.016g of ammonium persulfate in a beaker at room temperature, add 5.0ml of dimethyl sulfoxide to prepare a mixed solution; the concentration of acrylic acid is 1.05mol / L, The concentration of acrylamide is 7mol / L, and the concentration of ammonium persulfate is 0.0070mol / L;

[0051] 3) Mix the mixed solution in step 2) and the VDT solution in step 1) in an ice-water bath at 0°C and stir evenly. After one hour, add 60 μL of tetramethylethylenediamine to obtain acrylamide-acrylic acid-VDT mixture solution;

[0052] 4) Pour the acrylamide-acrylic acid-VDT mixed solution obtained in step 3) into a glass mold with a polyester film inside, place it in a hot water bath environment at 50°C, and react for 12 hours, and th...

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Abstract

The invention discloses a preparation method and a use method of polyacrylamide-acrylic acid-VDT physical-crosslinking high-strength hydrogel. The preparation method comprises the steps: firstly, fully stirring acrylamide, VDT and acrylic acid in dimethyl sulfoxide to obtain an even mixed solution; thermally initiating the mixed solution at a certain temperature to obtain soft preformed gel; thensoaking the soft preformed gel in a water solution of ferric nitrate nonahydrate; forming multi-hydrogen bonds from the VDT, and forming physical-crosslinking high-strength hydrogel through a metal coordination interaction formed by ferric ions and carboxyl. The hydrogel material has the performance of quickly and selectively forming strong hydrogen bonds with target molecules in the water solution, adsorbing the target molecules of specific structures and gathering the target molecules. A preparation process of the preparation method disclosed by the invention has the advantage of simplenessand convenience in operation; furthermore, product performance is excellent; meanwhile, the hydrogel can be applied to the fields of matter separation and purification, sensing technologies, analysistechnologies and the like.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a preparation method of poly(acrylamide-acrylic acid-VDT) physically cross-linked high-strength hydrogel. Background technique [0002] 2-vinyl-4,6-diamino-1,3,5-triazine (VDT) is a functional monomer that has been commercialized, and 2-vinyl-4,6 - Homopolymers of diamino-1,3,5-triazines or copolymers with other monomers. Li Xuefeng (Li Xuefeng, Liu Zuifang, etc., CN 103059493 A, 2013.04.24) research group has prepared this kind of polymer, because the diaminotriazine pendant functional group it carries can selectively interact with the target in solution (including aqueous solution). Molecules or units form strong hydrogen bonds and adsorb a series of target molecules with specific chemical composition and structure, such as uric acid, nucleic acid bases, nucleotides, nucleosides, deoxyribonucleic acid and proteins, etc., which are of great research value . The hydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J3/075C08F220/56C08F220/06C08F226/06
CPCC08F220/56C08J3/075C08J3/243C08J2333/26C08F220/06C08F226/06
Inventor 李学锋李荣哲王鹏舒萌萌张奕坤张楷沅王邓
Owner HUBEI UNIV OF TECH
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