Method for preparing nano silver/polystyrene composite material by microemulsion polymerization

A technology of microemulsion polymerization and composite materials, which is applied in the field of microemulsion polymerization to prepare nano-silver/polystyrene composite materials. It can solve the problems that are difficult to effectively solve the uniform dispersion of nano-silver stable PS matrix, and achieve excellent thermal stability. The effect of reunion guarantee and broad application prospects

Inactive Publication Date: 2013-01-16
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the various methods of preparing nano-silver / polystyrene composite materials in the prior art, it is still difficult to effectively solve the stability of nano-silver and its uniform dispersion in PS matrix

Method used

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  • Method for preparing nano silver/polystyrene composite material by microemulsion polymerization
  • Method for preparing nano silver/polystyrene composite material by microemulsion polymerization
  • Method for preparing nano silver/polystyrene composite material by microemulsion polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Prepare 20 mL of sodium citrate and hydrazine hydrate solutions with a concentration of 1 mmol / L and 3 mmol / L, respectively. Under dark conditions, add 25% concentrated ammonia water dropwise to a round bottom flask filled with 20mL silver nitrate solution (10mmol / L) until the precipitate just dissolves to obtain a silver ammonia solution. Under continuous stirring, sodium citrate, polyvinylpyrrolidone and hydrazine hydrate solutions were sequentially added to the silver ammonia solution, and the temperature was 35° C. for 1 hour to prepare sample 1.

[0036]Use X-ray diffraction and transmission electron microscopy to analyze the phase and microscopic morphology of the product, and its X-ray diffraction pattern is as follows figure 1 shown. According to the X-ray diffraction data, the average size of the sample is calculated by the Scherrer formula to be about 20nm, and the transmission electron microscope photo of sample 1 ( figure 2 ), it can be seen that the aver...

Embodiment 2

[0038] Prepare sodium citrate solution, silver ammonia solution and polyvinylpyrrolidone solution with concentrations of 1mmol / L, 10mmol / L and 10mmol / L respectively, and mix them in equal volumes. Then add an equal volume of hydrazine hydrate solution with a concentration of 3 mmol / L. The temperature was 35° C. for 1 hour to prepare sample 2. The transmission electron microscope photo of sample 2 is as image 3 As shown, it can be seen from the figure that after adding polyvinylpyrrolidone to the system, the average size of nano-silver is reduced to about 10nm, the monodispersity is significantly improved, and there is no agglomeration phenomenon.

Embodiment 3

[0040] Get 3g dodecyltrimethylammonium bromide, 30mL water, 1mL styrene is made into normal phase microemulsion, then add 5mL silver sol prepared by embodiment 2, 0.02g initiator azobisisobutyronitrile (about 2% of the mass of styrene monomer), the temperature was raised to 75°C and reacted for 2 hours to obtain sample 3.

[0041] Figure 4 is the infrared analysis comparison chart of sample 2 and sample 3. From the infrared spectrum, it can be seen that sample 3 is at 3104.3cm -1 、3081.9cm -1 、3059.8cm -1 、3025.7cm -1 and 3001.6cm -1 The infrared absorption peak that appears is the stretching vibration absorption peak of benzene ring hydrogen, 698.7cm -1 The weak infrared absorption that appears is the deformation vibration absorption peak of benzene ring hydrogen, 756.1cm -1 The obvious vibration absorption peak is the out-of-plane deformation vibration absorption peak of methylene, so it is inferred that there is polystyrene in sample 3. Figure 5 is the transmission el...

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Abstract

The invention discloses a method for preparing a nano silver / polystyrene composite material by microemulsion polymerization. The method is characterized by comprising the following steps: adding ammonia water to silver nitrate solution until the precipitate is dissolved to obtain silver-ammonia solution; adding sodium citrate, polyvinyl pyrrolidone and hydrazine hydrate to the silver-ammonia solution according to a molar ratio of silver diamminohydroxide to sodium citrate to polyvinyl pyrrolidone to hydrazine hydrate being 1:(0.1-0.3):(0.1-0.3):(1-1.5) under the condition of stirring, and reacting at the temperature of 0-50 DEG C for 0.1-2 hours to obtain silver sol; adding dodecyl trimethyl ammonium bromide and styrene to the silver sol according to a mass ratio of silver in the silver sol to dodecyl trimethyl ammonium bromide to styrene being (1-10):(3-10):(1-5) to obtain a positive phase microemulsion; and adding an initiator, reacting at the temperature of 60-100 DEG C for 1.5-3 hours, and purifying reaction products to obtain the nano silver / polystyrene composite material with excellent mechanical performance and thermostability.

Description

technical field [0001] The invention belongs to a preparation method of a composite material of an inorganic metal and an organic polymer compound, and relates to a method for preparing a nano silver / polystyrene composite material by microemulsion polymerization. The prepared nano-silver / polystyrene composite material can be widely used in the fields of antibacterial materials, conductive materials, self-cleaning materials, catalytic materials, and other high-tech fields. Background technique [0002] Nano-silver / polystyrene composite materials are widely used in antibacterial materials, conductive materials, self-cleaning materials and catalytic materials due to the special properties of nano-silver in optics, electricity and catalysis and the excellent mechanical properties of polystyrene (PS). etc. have broad application prospects; at the same time, nano-silver / polystyrene composite materials can be used in other high-tech fields as special doping materials. In the prior...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L25/06C08K9/10C08K3/08C08F12/08C08F2/28C08F2/44
Inventor 刘才林李俊江杨海君任先艳杨军校
Owner SOUTHWEAT UNIV OF SCI & TECH
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