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Barium strontium titanate/polystyrene core-shell structure and preparation method thereof

A technology of barium strontium titanate and polystyrene, which is applied in the field of advanced nanostructured materials, can solve the problems of large kinetic factors, difficult control of composite particle shape and particle size, complex nucleation mechanism of emulsion polymerization, etc., and achieves simple polymerization mechanism. Effect

Inactive Publication Date: 2016-01-20
SHANGHAI YUEDA NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the pH value or ionic strength of the system has a great influence on the formation of composite particles, and the nucleation mechanism of emulsion polymerization is relatively complicated, and kinetic factors have a greater impact on emulsion polymerization, so the shape and particle size of composite particles are difficult to control

Method used

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  • Barium strontium titanate/polystyrene core-shell structure and preparation method thereof
  • Barium strontium titanate/polystyrene core-shell structure and preparation method thereof
  • Barium strontium titanate/polystyrene core-shell structure and preparation method thereof

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Embodiment 1

[0027] Utilize the method provided by the invention to prepare the strontium barium titanate / polystyrene core-shell structure whose shell thickness is 10nm, its operation steps are as follows:

[0028] (1) 25 mg of strontium barium titanate nanocrystals prepared by microwave-assisted Glycothermal method (chemical formula is Ba 0.6 Sr 0.4 TiO 3 ) was ultrasonically dispersed in 40ml of methanol, the ultrasonic power was 100W, and the ultrasonic time was 10min; 3.34g of the initiator 2-bromo-2-methylpropionic acid (Br-MPA) was added, and magnetically stirred at room temperature for 72h under an Ar protective atmosphere, and stirred The speed is 20rpm;

[0029] (2) Separate the initiator-modified nanocrystals from the liquid phase at a centrifugation speed of 8000rpm for 25 minutes; wash the residual initiator molecules with a mixed solvent of cyclohexane-ethanol, in which the mass fraction of ethanol is 30%, after three times After washing and centrifugation, the obtained ini...

Embodiment 2

[0034] Utilize the method provided by the invention to prepare the strontium barium titanate / polystyrene core-shell structure whose shell thickness is 15nm, its operation steps are as follows:

[0035] (1) 40 mg of strontium barium titanate nanocrystals prepared by microwave-assisted Glycothermal method were ultrasonically dispersed in 60 ml of methanol, the ultrasonic power was 150 W, and the ultrasonic time was 8 min; the initiator 2-bromo-2-methylpropionic acid (Br-MPA ) 10.02g, magnetically stirred at room temperature for 96h under an Ar protective atmosphere, and the stirring speed was 30rpm;

[0036] (2) Separate the nanocrystals modified by the initiator from the liquid phase at a centrifugation speed of 10,000 rpm for 15 minutes; wash the residual initiator molecules with a mixed solvent of cyclohexane-ethanol, in which the mass fraction of ethanol is 20%, after three times After washing and centrifugation, the obtained initiator-modified wet nanocrystals were irradiat...

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Abstract

The invention relates to a barium strontium titanate / polystyrene core-shell structure and its preparation method. The barium strontium titanate nanocrystals (Ba0.6Sr0.4TiO3) prepared by a microwave-assisted Glycothermal method and a styrene monomer (St) are adopted as raw materials, 2-bromo-2-methyl propionic acid (Br-MPA) is taken as an initiator, and under a solvent free condition, by means of atom transfer radical polymerization, the barium strontium titanate / polystyrene core-shell structure can be synthesized. The barium strontium titanate / polystyrene core-shell structure prepared by the method provided by the invention has the characteristics of controllable shell thickness, uniform size distribution and good dispersion stability, etc. The barium strontium titanate / polystyrene core-shell structure provided by the invention has important application value to preparation of an ultra-high density ferroelectric memory planar nano-ordered array structure.

Description

technical field [0001] The invention belongs to the field of advanced nanostructure materials, and relates to a strontium barium titanate / polystyrene core-shell structure and a preparation method thereof, and is useful for ultra-high-density ferroelectric memory planar nano-ordered array structures and related microelectronic or nanoelectronic devices The preparation has important application value. Background technique [0002] The preparation of nano-optoelectronic structure devices by self-assembly of nanoparticles has become a research hotspot in the field of inorganic nanomaterials in the 21st century. However, the direct self-assembly of nanoparticles is often closely related to the intrinsic physical properties of the particles and their interactions between particles. However, the direct self-assembly of nanoparticles still has a lot of challenging problems to be solved, especially some key physical and chemical parameters that affect the process of self-assembly of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F112/08C08K3/24C08F292/00
Inventor 蔡铜祥杨晓伟杨玉晴
Owner SHANGHAI YUEDA NEW MATERIAL TECH
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