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Preparation method of polyvinyl alcohol composite film with embedded silver-wrapped nanoparticles

A technology of silver nanoparticles and polyvinyl alcohol, which is applied in the field of composite material preparation of metal nanoparticles prepared by ultraviolet light reduction method, can solve the problems of surface passivation of nanoparticles, deterioration of mechanical properties of polymer matrix, side reactions, etc., and achieve Relieve oxidation and agglomeration, avoid side reactions, uniform size effect

Inactive Publication Date: 2013-08-14
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

The nanoparticles formed by this method have a wide size distribution, uneven particle dispersion, and the surface of the nanoparticles is easily passivated by surfactants or oxide layers, making it difficult to achieve a high degree of uniformity in polymer-metal nanoparticle mixing (see article Gamma-irradiation assisted seeded growth of Ag nanoparticles within PVA matrix, Materials Chemistry and Physics 128(2011)109-113)
At the same time, the use of chemical reducing agents is likely to cause unnecessary side reactions, and may even deteriorate the mechanical properties of the polymer matrix.

Method used

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  • Preparation method of polyvinyl alcohol composite film with embedded silver-wrapped nanoparticles

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preparation example Construction

[0021] The preparation method of polyvinyl alcohol embedded silver nano particle composite film of the present invention comprises the following steps:

[0022] ① Preparation of polyvinyl alcohol-silver nitrate solution:

[0023] Dissolve the polyvinyl alcohol powder in deionized water according to the ratio of 7-9g polyvinyl alcohol powder per 100ml of water, and let it stand for swelling; raise the temperature to 93-98°C under the condition of magnetic stirring, return the condenser tube to evaporate the solvent, and heat Until the solution becomes a uniform transparent viscous shape, it is called a polyvinyl alcohol solution. After the polyvinyl alcohol solution is cooled to room temperature in the ambient air, dilute nitric acid is added dropwise to adjust the pH value of the polyvinyl alcohol solution. The value ranges from 1 to 5.6; silver nitrate aqueous solution is added to the polyvinyl alcohol solution to form a polyvinyl alcohol-silver nitrate solution, wherein the ...

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Abstract

The invention discloses a preparation method of a polyvinyl alcohol composite film with embedded silver-wrapped nanoparticles, comprising the following steps: (1) preparing a polyvinyl alcohol-silver nitrate solution; (2)preparing a polyvinyl alcohol-silver nitrate film by using spin coating method or casting film method; and (3) irradiating the polyvinyl alcohol-silver nitrate film with ultraviolet light. The prepared composite film has the characteristics of uniform metal nanoparticle size distribution, controllable dimension, uniform shape, and uniform dispersion.

Description

technical field [0001] The invention relates to the fields of polymer-metal nanoparticle composite material, photochemistry, optical storage, biological antibacterial and the like, and is a composite material preparation method for preparing metal nanoparticle by an ultraviolet light reduction method. Background technique [0002] Polymer / metallic silver nanocomposites combine the properties of metal nanoparticles and the processability of polymers, opening up a new path for the development of nanocomposite systems with advanced and novel properties. Generally, there are two preparation techniques for such composite materials: in situ and ex situ. In the ex situ technology, the polymerization of polymer monomers and the nucleation of metal nanoparticles are carried out separately, and then the nanocomposites are realized by mechanical mixing. In situ technology, metal nanoparticles are generated in a polymer matrix by decomposition (photoreduction, radiation reduction, ther...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/12C08J5/18C08L29/04C08K3/08
Inventor 宋晶耿永友
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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