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Preparation of polystyrene-SiO2 core-shell nanostructure composite particles with sunken structure

A technology of nanocomposite particles and polystyrene, which is applied in the field of preparation of polystyrene-SiO2 core-shell nanocomposite particles, can solve the problems of difficult mass production and cumbersome steps, and achieve simple operation, high stacking efficiency and thin shell Effect

Active Publication Date: 2019-02-22
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is that the steps are cumbersome: it is necessary to transfer the polymer particles to an alcohol medium for sol-gel coating, and then perform centrifugal purification; in addition, the sol-gel method is difficult to be used for mass production

Method used

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  • Preparation of polystyrene-SiO2 core-shell nanostructure composite particles with sunken structure
  • Preparation of polystyrene-SiO2 core-shell nanostructure composite particles with sunken structure
  • Preparation of polystyrene-SiO2 core-shell nanostructure composite particles with sunken structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A polystyrene-SiO with concave structure 2 The preparation method of core-shell nanocomposite particles, the specific steps are:

[0032] Step 1: In the presence of silica sol, polystyrene-SiO is prepared by dispersion polymerization of styrene in methanol 2Core-shell nanocomposite particles, the specific steps are: mix 2.5mL styrene, 6.67g SiO 2 Alcohol sol and 17mL of methanol were added to a 250ml three-necked round-bottomed flask equipped with a condenser tube and a magnetic stirrer, nitrogen gas was passed for 30 minutes, and then nitrogen gas was continued and the oil bath was heated to 60°C. Polymerization was initiated by injecting a solution of 23 mg of azobisisobutylamidine hydrochloride in 2 mL of methanol. The reaction was continued with stirring at 60°C for 24 hours. After stopping the reaction, the reaction product was centrifuged and washed eight times (3000 rpm, 30 minutes each), and the supernatant was replaced with methanol after each centrifugation...

Embodiment 2

[0034] Embodiment 2: Referring to the operation of Step 2 in Embodiment 1, heat and stir at a speed of 600 rpm. Others remain unchanged. The surface morphology of composite particles was observed by scanning electron microscope and transmission electron microscope. Transmission electron microscopy observed that the proportion of depressed particles was close to 100%.

Embodiment 3

[0035] Embodiment 3: Refer to the operation of Step 2 in Embodiment 1, heat and stir at a temperature of 65°C. Others remain unchanged. The surface morphology of composite particles was observed by scanning electron microscope and transmission electron microscope. The proportion of sunken particles observed by transmission electron microscope is about 80%.

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Abstract

The invention provides a preparation method of polystyrene-SiO2 core-shell nanostructure composite particles with a sunken structure. The preparation method is characterized by comprising the following steps: S1, in the presence of silica sol, carrying out dispersion polymerization of styrene in methanol to prepare polystyrene-SiO2 core-shell nanostructure composite particles; and S2, adding a mixed solvent of the polystyrene-SiO2 core-shell nanostructure composite particles, methanol and water and decane into a reaction container, heating and stirring in a sealed state for 12-36 hours; and then cooling to obtain the polystyrene-SiO2 core-shell nanostructure composite particles with a sunken structure. The preparation method of the polystyrene-SiO2 core-shell nanostructure composite particles with a sunken structure provided by the invention is simple to operate, and the shape of the polystyrene-SiO2 core-shell nanostructure composite particles can be further enriched.

Description

technical field [0001] The invention relates to a polystyrene-SiO with a concave structure 2 A method for preparing core-shell nanocomposite particles. Background technique [0002] The appearance and shape of colloidal particles are very important to the physical and chemical properties of colloidal materials. Depressed colloidal particles are a special kind of particles with anisotropic shape. In recent years, this kind of colloidal particles has been studied more, not only because of its shape similar to common apples, cherries and bowls in daily life, but also because of its special shape in colloidal crystallization, self-assembly, biomedicine and other fields. It has broad application prospects. [0003] As far as polymer particles are concerned, due to the existence of surface tension, they usually tend to form spherical shapes to minimize the interfacial free energy of the entire system, so it is relatively difficult to prepare non-spherical polymer particles with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00
CPCC08G83/001
Inventor 邹华苗丹丹王霞
Owner UNIV OF SHANGHAI FOR SCI & TECH