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Preparation method of amphiphilic gradient copolymer self-assembled in-situ composite silver nanoparticle

A technology of composite nanoparticles and silver nanoparticles, which is applied in the field of polymer chemistry, can solve unseen problems and achieve the effects of easy control, high stability and low cost

Inactive Publication Date: 2013-08-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there have been no reports on amphiphilic gradient copolymers used as carriers to composite nanoparticles.

Method used

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  • Preparation method of amphiphilic gradient copolymer self-assembled in-situ composite silver nanoparticle

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Embodiment 1

[0026] (1) Synthesis of silver nanoparticles using PEI as a dispersion protective agent:

[0027] AgNO 3 Powder 0.034g dissolved in H 2 O, then add 0.2g PEI as a dispersing protective agent, stir and ultrasonically mix to prepare 200mL of oxidation solution. 0.0378gNaBH 4 Dissolve in 15mLH 2 O to obtain the reducing solution. Under constant temperature magnetic stirring, the oxidizing solution was added dropwise to the reducing solution at a rate of 30 drops / minute until the reaction was completed, and the reaction was stirred for 12 hours. Finally, the reaction solution was centrifuged at 10000r / min in a centrifuge, and the precipitate was washed twice with ethanol and acetone, and then centrifuged at a high speed again at 40 ℃ Vacuum-dried to obtain hydrophilic silver nanoparticle powder with an average particle diameter of 4.86 nm.

[0028] (2) Synthesis of amphiphilic gradient copolymer:

[0029] Add 32.8g of water and 0.463g of S-1-dodecyl-S'-[(1,3,5,7,9,11,13-hept...

Embodiment 2

[0033] Using PVP as the dispersion protection agent, the nano-silver particles were synthesized according to the method in step (1) of Example 1, with an average particle diameter of 5.02 nm. 2.16g acrylic acid (AA) and 6.72g trifluoroethyl methacrylate (TFEMA) are synthesized by the method in the step (2) of embodiment 1 the amphiphilic gradient copolymer of acrylic acid-trifluoroethyl methacrylate ( poly(AA-grad-TFEMA)), the molecular weight of the copolymer is 18000Da, and the PDI is 1.3. Then, add 0.05g of amphiphilic gradient copolymer dissolved in 5mLdioxane / 0.5mLH 2 O mixed solvent, stirred for 12h until the copolymer was completely dissolved. Add 0.005g of hydrophilic nano-silver particle powder to 3mLH 2 O, ultrasonically dispersed for 0.5h, and then stirred and mixed with the copolymer solution for 0.5h. Add 2.5mL of H2 dropwise at a rate of 5mL / h 2 O, add H for the first time 2 After the O is over, quickly add 1 mL of dioxane dissolved with 0.01 mL of dodecyl m...

Embodiment 3

[0035] Using sodium citrate as a dispersion protection agent, silver nanoparticles were synthesized according to the method in step (1) of Example 1, with an average particle diameter of 5.27 nm. 2.88g acrylic acid (AA) and 6.12g hexafluorobutyl acrylate (F 6 BA) according to the method in the step (2) of embodiment 1, synthesize the amphiphilic gradient copolymer (poly(AA-grad-F 6 BA)), the molecular weight of the copolymer is 19000Da, and the PDI is 1.3. Then, add 0.05g of amphiphilic gradient copolymer dissolved in 5mLdioxane / 0.5mLH 2 O mixed solvent, stirred for 12h until the copolymer was completely dissolved. Add 0.005g of hydrophilic nano-silver particle powder to 3mLH 2 O, ultrasonically dispersed for 0.5h, and then stirred and mixed with the copolymer solution for 0.5h. Add 2.5mL of H2 dropwise at a rate of 5mL / h 2 O, add H for the first time 2 After the O is over, quickly add 1 mL of dioxane dissolved with 0.01 mL of dodecyl mercaptan to modify the hydrophilic ...

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Abstract

The invention relates to a preparation method of an amphiphilic gradient copolymer self-assembled in-situ composite silver nanoparticle, which is a preparation method of an in-situ composite nanoparticle taking an amphiphilic gradient copolymer as the shell and a silver nanoparticle as the core. The preparation method comprises the following specific steps: dispersing a hydrophilic silver nanoparticle in an amphiphilic gradient copolymer solution, and performing solvent induction to form the amphiphilic gradient copolymer into micelle through self assembling; and at the same time of forming the micelle, performing surface hydrophobicity modification on the silver nanoparticle with hydrophobic modifier, and ensuring that the silver nanoparticle optionally moves into the hydrophobic inner core of the polymer micelle under hydrophobic action, thus obtaining the composite nanoparticle taking the amphiphilic gradient copolymer as the shell and the silver nanoparticle as the core. The composite nanoparticle prepared by the invention is high in stability, simple in preparation process, mild in preparation conditions and easy to control, and can be used in the fields of electronics, optics and catalysts.

Description

technical field [0001] The invention relates to the technical fields of polymer chemistry and polymer / metal particle nanocomposite, in particular to an amphiphilic gradient copolymer successfully compounded with silver nanoparticles through self-assembly to form a novel core-shell composite nanostructure. Background technique [0002] Polymer / metal nanoparticle hybrid materials not only have the mechanical properties, solubility, and processability of the polymer itself, but also have the characteristics of the nanoparticles hybridized in it, and have important application values ​​in the fields of optoelectronics, biology, and catalysis. . A common method for preparing polymer / metal nanoparticle hybrid materials is to use polymer micelles as "nanoreactors" to load inorganic precursor salts, followed by in situ reduction reactions. Joachim et al. made the PS-PEO block copolymer form micelles in the selected solvent by adding the inorganic precursor salt LiAuCl 4 The comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08F220/22C08F220/06C08F212/08C08F220/56C08K9/04C08K3/08B22F1/00
Inventor 陈艳军韩梅张长祥陆志伟姚荣沂夏元玲卢超
Owner WUHAN UNIV OF TECH
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