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Nanometer plural gel and preparation method thereof

A nano-composite and composite gel technology, applied in the field of nano-composite gel and its preparation, can solve the problems of time-consuming, cumbersome changes in temperature and pH value, etc., and achieve the effect of fast reaction and good spatial positioning

Active Publication Date: 2013-08-14
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Commonly used smart polymer gels mostly use polymers that are sensitive to temperature or pH, such as poly-N-isopropylacrylamide (PNIPAAm) or polyacrylic acid (PAA), and the entirety of the gel will change when a response occurs. It is impossible to control only the local area. In addition, the change of environmental factors such as temperature and pH value is also cumbersome and time-consuming.

Method used

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  • Nanometer plural gel and preparation method thereof
  • Nanometer plural gel and preparation method thereof
  • Nanometer plural gel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Add 3g of cellulose cotton pulp (molecular weight: 90,000) into 100g of 7wt% sodium hydroxide / 12wt% urea mixed aqueous solution pre-cooled to -13°C, stir at room temperature for 5 minutes, centrifuge and degas to obtain a cellulose solution, and put it in the mold After the film is formed in the medium, it is put into a coagulation bath aqueous solution at 30° C. for coagulation, taken out after 5 minutes, and rinsed with water to obtain a cellulose gel film.

[0033] Prepare 3mL aqueous solution of gold nanorods (diameter 10nm, length 51nm), 1.0mol / L NIPPAm monomer, 0.003mol / L cross-linking agent N,N-methylenebisacrylamide with a concentration of 0.04mg / mL, stir to dissolve, Nitrogen was passed through the solution for 30 minutes, 3.50 mg of initiator α-ketoglutaric acid (molar concentration: 0.008 mol / L) was added, and nitrogen was passed for another 7 minutes, and the solution was injected into the glass mold in which the cellulose gel film had been placed In the pro...

Embodiment 2

[0037] Add 5g of polyvinyl alcohol (molecular weight: 75000) into 100g of water, heat to 90°C, stir and dissolve to obtain PVA solution, after forming a film in the mold, put it into 0.6wt% glutaraldehyde solution, heat to 30°C for about Carry out cross-linking reaction for 1 hour, take out after gelation, rinse with water to obtain PVA gel film.

[0038] Prepare 5 mL of single-walled carbon nanotubes (diameter 1-2 nm, length 10 μm) with a concentration of 0.20 mg / mL, 1.6 mol / L NIPPAm monomer, and 0.008 mol / L cross-linking agent N,N-methylenebisacrylamide Aqueous solution, stirred to dissolve, nitrogen gas was passed into the solution for 40 minutes, 7.38mg initiator 2,2-dimethoxy-2-phenylacetophenone (molar concentration 0.006mol / L) was added, and nitrogen gas was passed for 10 minutes, and The solution is poured into the glass mold that has been placed in the PVA gel film. After the mold is closed, it is irradiated with ultraviolet light for 3 hours to initiate polymerizatio...

Embodiment 3

[0041]Add 7g of cellulose cotton pulp (molecular weight: 90,000) into 100g of 7wt% sodium hydroxide / 12wt% urea mixed aqueous solution pre-cooled to -13°C, stir at room temperature for 15 minutes, centrifuge and degas to obtain a cellulose solution, and place it in the mold After the film is formed in the medium, put it into a 10°C coagulation bath aqueous solution to coagulate, take it out after 5 minutes, and rinse it with water to obtain a cellulose gel film.

[0042] Prepare 5 mL of an aqueous solution of gold nanoparticles (diameter 1-2 nm) with a concentration of 0.06 mg / mL, 0.7 mol / L NIPPAm monomer, and 0.005 mol / L cross-linking agent ethylene glycol dimethacrylate, stir to dissolve, and add to the solution Nitrogen was passed through for 40 minutes, 5.11 mg of initiator α-ketoglutaric acid (molar concentration 0.006mol / L) was added, and nitrogen was passed for another 10 minutes. The solution was injected into the glass mold that had been placed in the cellulose gel film...

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Abstract

The invention discloses a nanometer plural gel and a preparation method thereof. The preparation method comprises the following steps of: (1) preparing a polymer into a film in a mould, and then solidifying or cross-linking to obtain a polymer gel film; and (2) adding a nanometer material, N-isopropylacrylamide, a cross-linking agent and an initiating agent to water to obtain a mixed solution, adding the mixed solution to the mould with the polymer gel film, and carrying out polymerization reaction and cross-linking reaction under the irradiation of an ultraviolet lamp to obtain the nanometer plural gel. The nanometer plural gel provided by the invention has a double-layer structure; and PNIPAAm gel which contains nanometer particles can generate the temperature and volume change of a specific area under illumination due to photothermal effect and can integrally generate response behaviors, such as bending and the like.

Description

technical field [0001] The invention relates to a nanocomposite gel and a preparation method thereof. Background technique [0002] Gel is composed of a three-dimensional cross-linked polymer network and a solvent filled in the network gap. It is a material between liquid and solid that can hold a large amount of solvent without being dissolved in the solvent. Because of its unique water absorption and water retention and Good biocompatibility and other advantages have been widely used in the fields of material science and biomedicine, such as contact lenses, physiological hygiene products, drug delivery, wastewater treatment, sealing materials, cooling agents, packaging materials, etc. [0003] The gel has a unique ability to respond to environmental stimuli, that is, a reversible swelling-deswelling process occurs when environmental factors change, and the volume also expands-shrinks accordingly. Since Tanaka et al. first discovered in 1978 that the polyacrylamide gel cro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/18C08J3/24C08L5/08C08L1/02C08L5/04C08L29/04C08L71/08C08K3/08C08K7/06C08K7/00C08K3/04C08F251/00C08F251/02C08F261/04C08F283/06C08F220/54
Inventor 王永鑫毛云增吴俊杰张小莉赵宁徐坚
Owner INST OF CHEM CHINESE ACAD OF SCI
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