Preparation method for temperature-sensitive hydrogel/silver nanocomposite

A composite material and sensitive technology, applied in botany equipment and methods, chemical instruments and methods, organic compound/hydride/coordination complex catalysts, etc. Solve the problems of low silver content, achieve the effects of improving swelling performance and heat resistance, good biocompatibility, and easy availability of raw materials

Inactive Publication Date: 2013-07-10
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the swelling performance of the hydrogel drops greatly after loa

Method used

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  • Preparation method for temperature-sensitive hydrogel/silver nanocomposite
  • Preparation method for temperature-sensitive hydrogel/silver nanocomposite
  • Preparation method for temperature-sensitive hydrogel/silver nanocomposite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 1.0 g of chitosan in 50 ml of 4% acetic acid solution and stir for 2 hours to dissolve it completely. Add 2.0 g of N-isopropylacrylamide, a temperature-sensitive monomer, and 0.15 g of methylenebisacrylamide, a chemical cross-linking agent, into the above solution under stirring conditions, and continue stirring for 30 minutes to prepare an aqueous reactant solution. Add 10ml of 1% initiator potassium persulfate aqueous solution to the above reactant solution, blow nitrogen, heat up to 60 degrees Celsius under constant stirring, and react for 4 hours. The product is washed with absolute ethanol and distilled water to remove unreacted monomers. and a crosslinking agent, and dry in a vacuum oven to obtain a white chitosan grafted N-isopropylacrylamide hydrogel. The dried hydrogel was fully swollen in distilled water for 1 day, transferred to 50ml of silver nitrate solution with a concentration of 5mmol / L and continued to soak for 24 hours, adding 10ml of the redu...

Embodiment 2

[0026] Dissolve 2.0 g of chitosan in 50 ml of 6% acetic acid solution and stir for 1 to 5 hours to completely dissolve it. Add 4.0 g of N-isopropylacrylamide, a temperature-sensitive monomer, and 0.2 g of methylenebisacrylamide, a chemical crosslinking agent, into the above solution under stirring conditions, and continue stirring for 30 minutes to prepare an aqueous solution of reactants. Add 10 ml of 2% initiator potassium persulfate aqueous solution to the above reactant solution, blow nitrogen, heat up to 60 degrees Celsius under constant stirring, and react for 6 hours. The product is washed with absolute ethanol and distilled water to remove unreacted monomers. and a crosslinking agent, and dry in a vacuum oven to obtain a white chitosan grafted N-isopropylacrylamide hydrogel. The dried hydrogel was fully swelled in distilled water for 2 days, transferred to 100ml concentration of silver nitrate solution of 5mmol / L and continued to soak for 24 hours, adding 40ml concentr...

Embodiment 3

[0029] Dissolve 5.0 g of chitosan in 200 ml of 10% acetic acid solution and stir for 5 hours to dissolve it completely. Add 6.0 g of N-isopropylacrylamide, a temperature-sensitive monomer, and 0.5 g of methylenebisacrylamide, a chemical cross-linking agent, into the above solution under stirring conditions, and continue stirring for 30 minutes to prepare an aqueous reactant solution. Add 10 ml of 3% initiator potassium persulfate aqueous solution to the above reactant solution, blow nitrogen, heat up to 60 degrees Celsius under constant stirring, and react for 8 hours. The product is washed with absolute ethanol and distilled water to remove unreacted monomers. and a crosslinking agent, and dry in a vacuum oven to obtain a white chitosan grafted N-isopropylacrylamide hydrogel. The dried hydrogel was fully swelled in distilled water for 2 days, transferred to 150ml concentration of silver nitrate solution of 5mmol / L and continued to soak for 24 hours, adding 60ml concentration ...

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Abstract

The invention discloses a preparation method for a temperature-sensitive hydrogel/silver nanocomposite. The preparation method comprises the following concrete steps: (1) dissolving chitosan in an acetic acid solution to prepare a solution with a concentration of 1 to 10%, preparing an aqueous reactant solution from a temperature-sensitive monomer and a chemical cross-linking agent and adding the aqueous reactant solution into the above-mentioned solution; (2) adding an aqueous initiator solution into the aqueous reactant solution, introducing nitrogen for protection, heating to a temperature of 50 to 80 DEG C, carrying out a reaction for 6 to 12 h under the condition of uniform-speed stirring and carrying out washing and drying so as to obtain a temperature-sensitive chitosan hydrogel; and (3) subjecting the dried hydrogel to full swelling in distilled water for 1 to 3 d, adding a silver salt, adding a reducing agent for a reaction for 2 to 5 h and carrying out purifying and drying so as to obtain the hydrogel/silver nanocomposite. The preparation method provided by the invention has the advantages of simple process and mild reaction conditions. The hydrogel/silver nanocomposite prepared in the invention has stable physical and chemical performances and temperature sensitivity.

Description

technical field [0001] The invention belongs to the field of functional polymer materials, and in particular relates to a preparation method of a temperature-sensitive hydrogel / silver nanocomposite material. Background technique [0002] Silver nanoparticles have excellent physical and chemical properties and antibacterial activity, and have broad application prospects in many fields such as electronics, optics, catalysis, and biomedicine. Due to the high specific surface activity of nanoparticles, there is a problem that they are easy to agglomerate during the application process. Using polymer hydrogel as the microreactor carrier prepared by silver nanoparticles is one of the effective methods to solve the agglomeration of silver nanoparticles. Hydrogel is a kind of polymer material with a crosslinked network structure formed by the entanglement of hydrophilic polymers through chemical bonds, hydrogen bonds, van der Waals forces or physical effects. It is insoluble in wat...

Claims

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Application Information

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IPC IPC(8): C08L51/02C08K3/08C08F251/00C08F220/54C08F222/38A01N59/16A01N25/10A01P1/00A01P3/00B01J31/06
Inventor 李桂英郭磊张停刘军深
Owner LUDONG UNIVERSITY
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