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Graphene oxide/polystyrene nano composite and preparation method thereof

A technology of polystyrene nanocomposite materials, applied in the field of graphene oxide/polystyrene nanocomposite materials, which can solve the problem of poor bonding interface between graphene oxide sheets and polymers, low comprehensive performance of composite materials, and dispersion Inhomogeneity and other problems, to achieve the effect of easy industrial implementation, easy operation and good repeatability

Inactive Publication Date: 2012-12-19
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the graphene oxide sheet is weakly bonded to the polymer, the interface condition is not good, and the dispersion is not uniform
This makes the performance of a single material in the graphene oxide / polymer composite material, especially the characteristics of graphene oxide, difficult to play well in the composite material, and the comprehensive performance of the composite material is not high; The preparation conditions are relatively harsh, which limits its further industrial application

Method used

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  • Graphene oxide/polystyrene nano composite and preparation method thereof
  • Graphene oxide/polystyrene nano composite and preparation method thereof
  • Graphene oxide/polystyrene nano composite and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] 1. Preparation of graphene oxide

[0024] Add 230mL of concentrated sulfuric acid with a mass concentration of 98% and 5g of sodium nitrate into a dry beaker, and cool in an ice-water bath. When the temperature of the system is lower than 5°C, stir and add 10g of flake graphite, mix well and slowly add 30g of potassium permanganate (KMnO 4 ), control the reaction temperature at 10-15°C, place the beaker in a constant temperature water bath at 35°C after reacting for 2 hours, continue stirring and reacting for 2 hours, add 460mL of deionized water by continuously adding water, and control the temperature of the reaction solution at 98°C , continue to stir for 30min, add 1.4L of deionized water to terminate the reaction, then add 25mL of 30% hydrogen peroxide, filter while hot, and wash the product with dilute hydrochloric acid (1:10 volume ratio) until there is no SO in the filtrate 4 2- (BaC1 2 The solution was tested for no precipitation), and then washed with deion...

Embodiment 2

[0031] 1, the preparation method of graphene oxide is the same as embodiment 1.

[0032] 2. Preparation of Pickering emulsion

[0033] Add 60 mg of graphene oxide prepared in step 1 to 40 mL of NaCl solution with a concentration of 0.5 M. After stirring, a uniform dispersion system of graphene oxide and salt is formed, and 2.0 g of styrene monomer is added to the resulting dispersion system, and ultrasonically Disperse for 10-60 minutes to form a stable Pickering emulsion with a styrene concentration of 0.48mol / L.

[0034] 3. Polymerization

[0035] 10 mg initiator K 2 S 2 o 8 Add it into the Pickering emulsion, stir and react at 65-85°C for 2-6 hours, cool to room temperature after the reaction, filter, wash and vacuum-dry to obtain a graphene oxide / polystyrene composite material.

Embodiment 3

[0037] 1, the preparation method of graphene oxide is the same as embodiment 1.

[0038] 2. Preparation of Pickering emulsion

[0039] 100mg of graphene oxide prepared in step 1 is added to 40mL of NaCl solution with a concentration of 0.2M. After stirring, a uniform dispersion system of graphene oxide and salt is formed, and 2.0g of styrene monomer is added to the resulting dispersion. Ultrasonic dispersion for 10-60 minutes forms a stable Pickering emulsion with a styrene concentration of 0.48mol / L.

[0040] 3. Polymerization

[0041] 10 mg initiator K 2 S 2 o 8 Add it into the Pickering emulsion, stir and react at 65-85°C for 2-6 hours, cool to room temperature after the reaction, filter, wash and vacuum-dry to obtain a graphene oxide / polystyrene composite material.

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Abstract

The invention discloses a graphene oxide / polystyrene nano composite and a preparation method thereof. The preparation method includes preparing a graphene oxide nanosheet; using graphene oxide as a solid surfactant to obtain stable Pickering emulsion under actions of coordination and stabilization of salt; and polymerizing the in-situ emulsion to obtain the graphene oxide / polystyrene nano composite. The specific steps of the preparation method include oxidizing natural flake graphite by oxidants to obtain graphite oxide, carrying out ultrasonic exfoliation and centrifugal separation to obtain graphene oxide, adding the graphene oxide into salt solution and stirring the mixed solution to form a uniform dispersed system containing the graphene oxide and salt; and adding styrene into the dispersed system, carrying out ultrasonic treatment to obtain the stable Pickering emulsion, adding initiators into the Pickering emulsion, stirring and polymerizing to obtain the graphene oxide / polystyrene nano composite. The preparation method is good in repeatability, has the advantages of mild reaction conditions, low energy consumption and easiness in operation and brings convenience for industrialized implementation.

Description

1. Technical field [0001] The invention relates to a polymer composite material and a preparation method thereof. Specifically, water is used as a dispersion medium, graphene oxide nanosheets are used as a solid surfactant, and under the synergistic stabilizing effect of salt, a simple and effective preparation is made. Stable Pickering emulsion, after in-situ emulsion polymerization, the graphene oxide / polystyrene nanocomposite material is obtained. 2. Background technology [0002] Due to the special properties of graphene in terms of mechanics, quantum and electricity, the preparation of graphene / polymer composites has recently attracted increasing attention. [0003] Graphite oxide is considered as a strategic starting point for large-scale synthesis of graphene and has been extensively studied since it was prepared by Brodie in 1859. Graphene oxide (GO) is a monoatomic layer substance (thickness is about 1nm) after further exfoliation of graphite oxide, and is the prec...

Claims

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Application Information

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IPC IPC(8): C08F112/08C08F2/44C08F2/22C08K9/02C08K3/04
Inventor 史铁钧张丽园伍胜利
Owner HEFEI UNIV OF TECH
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