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Over-branched polyamidoamine and metal nano compound as well as preparation method and uses thereof

A technology of polyamidoamine and metal nanometers, which is applied in the field of hyperbranched polyamidoamine and metal nanocomposites and its preparation to achieve excellent antibacterial effects

Inactive Publication Date: 2008-07-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation of these metal nanoparticles, hyperbranched polymers do show excellent complexation and stabilization capabilities, but their disadvantage is that in order to effectively reduce metal ions, additional reducing agents are also required.

Method used

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  • Over-branched polyamidoamine and metal nano compound as well as preparation method and uses thereof
  • Over-branched polyamidoamine and metal nano compound as well as preparation method and uses thereof
  • Over-branched polyamidoamine and metal nano compound as well as preparation method and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 6.164g N, N-methylenebisacrylamide (40mmol) and 2.584g 1-(2-aminoethyl) piperazine (20mmol) into a mixed solvent of 40mL methanol and 20mL deionized water, under nitrogen protection , polymerized at 50°C for 150 hours, cooled at room temperature, added 10mL of dimethylamine aqueous solution (33wt%), continued the reaction at 50°C for 48 hours, concentrated the product by rotary evaporation, washed with acetone precipitation, and dried in vacuo at 50°C to obtain two Methylamine-terminated hyperbranched polyamidoamines. Yield 91%.

[0037] The total amine value of the hyperbranched polyamidoamine of gained dimethylamine end-capping is 0.17mol / g, and weight-average molecular weight is 1.4 * 10 5 g / mol, the radius of rotation is 14.04nm, and the hydrodynamic radius is 13.01nm. The ratio of the radius of rotation to the hydrodynamic radius is 1.08, which is close to 1.0, indicating that the polymer has a highly branched molecular structure. Accompanying drawing 1 is t...

Embodiment 2

[0040] 0.2g of the hyperbranched polyamidoamine in Example 1 was made into a 5wt% aqueous solution, and 0.1mol / L silver nitrate aqueous solution was added dropwise according to N / Ag=15, or 0.05mol was added dropwise according to N / Au=15 / L of chloroauric acid aqueous solution. Then the mixed solution was reacted at room temperature for 12 hours to obtain a stable nano-silver or nano-gold aqueous dispersion. Concentrate by rotary evaporation, precipitate with acetone, and dry in vacuum to obtain powdered brown-yellow polyamidoamine / silver nanocomposite or pink polyamidoamine / gold nanocomposite.

[0041] During the above reaction process, the generation of metal nanoparticles was tracked by using ultraviolet-visible light absorption spectrum, and its morphology was observed by transmission electron microscope. The results are shown in Figure 2. As can be seen from accompanying drawing 2 (A), along with the carrying out of reaction, the ultraviolet absorption peak at 433nm place...

Embodiment 3

[0043] Change N / Ag or N / Au feed molar ratio, under the condition of N / Ag or N / Au=10,20,30, according to the operating method of embodiment 2, the hyperbranched polyamidoamine in embodiment 1 The aqueous solution (10wt%) reacts with corresponding different amounts of silver nitrate or chloroauric acid to obtain metal nanoparticle aqueous dispersions with different particle sizes, which can be stored stably for more than half a year at normal temperature.

[0044] In the obtained hyperbranched polyamidoamine and metal nanocomposite, the weight percent content of the polymer is: 89%-98%; the metal nanoparticle component is gold or silver nanoparticles, and the metal weight percent content is: 2%-11%, A schematic diagram of its molecular structure is shown in Figure 3. In addition, the morphology of the prepared metal nanoparticles was measured by transmission electron microscopy, and the results are shown in Fig. 4 . Accompanying drawing 4 (A)-(C) is the transmission electron mi...

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Abstract

The invention relates to a hyper branched polyamide amine and metal nanometer compound and the preparation method and the application, belonging to the technical field of nanotechnology which is characterized in that: the compound comprises a polymer and metal nanometer particles, the polymer is the hyper branched polyamide amine made of blocking modification the hyper branched polyamide amine of the vinyl-terminated through different small organic molecules with amine, the content of the polymer is 89wt percent to 98wt percent; the metal nanometer particles are golden or silver nanometer particles, the content of the metal nanometer particles is 2wt percent to 11wt percent. During the preparation course, no reducing agent or ultraviolet irradiation is required, the precursor metal compounds are directly added into the hyper branched polyamide amine solution, and the metal nanometer particles with perfect water dispersion is generated only through one-step reaction under ambient temperature, the average particle size of which is one to eight nm, and the size is controllable. The inhibition zone method and the optical density method tested show that: the hyper branched polyamide amine and the metal nanometer particle compound have perfect antibacterial effects to a plurality of bacteria and fungus.

Description

technical field [0001] The invention relates to a composite in the field of nanotechnology, a preparation method and an application, in particular to a hyperbranched polyamidoamine and metal nanocomposite, a preparation method and an application. Background technique [0002] In recent years, polymer / metal (silver, palladium, platinum, gold, copper, etc.) nanocomposites have aroused intense research interest, and such nanocomposites can be widely used as catalysts, chemical sensors, electronic devices, etc. Therefore, it shows attractive application prospects in the development of new functional materials. In the preparation method of polymer / metal nanocomposites, metal ion precursors are usually compounded with specific polymers, and these polymers contain strong electron-donating centers (such as amine groups, carboxyl groups), so that they can play The effect of the template agent forms a strong complex with the metal ion; then, under the action of an external reducing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/00C08L79/02C08K3/08A01N59/16
Inventor 张永文黄卫周永丰颜德岳
Owner SHANGHAI JIAO TONG UNIV
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