Ultrasonic-assisted method for preparing polymer functionalized graphene

An ultrasonic-assisted, polymer technology, applied in the direction of dyeing polymer organic compound treatment, dyeing physical treatment, fibrous filler, etc., can solve the problem of low content of grafted polystyrene, achieve good dispersibility, simple and easy operation , the effect of excellent mechanical properties

Inactive Publication Date: 2012-06-27
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

However, ultrasonic irradiation can induce the polymerization of styrene, and can also degrade the macromolecular chains. Therefore, this method has the problem of low grafted polystyrene content, which is only 18wt%
In addition, the above research found that the choice of solvent in the reaction system is very important, only styrene solvent can induce the above grafting reaction, while other solvents, such as acetone, ethylbenzene, etc., cannot achieve the above purpose

Method used

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  • Ultrasonic-assisted method for preparing polymer functionalized graphene
  • Ultrasonic-assisted method for preparing polymer functionalized graphene
  • Ultrasonic-assisted method for preparing polymer functionalized graphene

Examples

Experimental program
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Effect test

Embodiment 1

[0032] In the present embodiment, adopt the following steps to prepare PVA functionalized graphene:

[0033] (1) PVA is dissolved in deionized water, mechanically stirred, and obtaining concentration is the PVA aqueous solution of 50g / L;

[0034] (2) measure this PVA aqueous solution of 50ml in container, then add 5mg graphene, continue to stir for 1 hour, obtain the mixed aqueous solution of PVA and graphene;

[0035] (3) Put the mixed aqueous solution of PVA and graphene in the ultrasonic equipment, discharge the air in the container with high-purity nitrogen, turn on the ultrasonic, set the power to 200W, control the temperature at 20°C, the frequency is 15kHz, and the ultrasonic treatment time For 2 hours, the ultrasonic treatment product was obtained;

[0036] (4) After filtering and washing the ultrasonically treated product with a solvent to remove free PVA, obtain PVA functionalized graphene after drying.

[0037] A solubility experiment was performed on the PVA func...

Embodiment 2

[0048] In the present embodiment, adopt the following steps to prepare PVA functionalized graphene:

[0049] (1) is exactly the same as the step (1) in embodiment 1, obtains the PVA aqueous solution that concentration is 50g / L;

[0050] (2) exactly the same as step (2) in embodiment 1, obtain the mixed aqueous solution of PVA and graphene;

[0051] (3) Put the mixed aqueous solution of PVA and graphene in the ultrasonic equipment, use high-purity nitrogen to discharge the air in the container, turn on the ultrasonic, set the power to 500W, control the temperature at 60°C, the frequency is 18kHz, and the ultrasonic treatment time For 5 hours, the ultrasonic treatment product was obtained;

[0052] (4) is exactly the same as step (2) in embodiment 1, obtains the graphene of PVA functionalization.

[0053] Solubility experiments on the PVA unfunctionalized graphene prepared above show that the PVA functionalized graphene can be uniformly dispersed in water to form a black dispe...

Embodiment 3

[0057] In the present embodiment, adopt the following steps to prepare PVA functionalized graphene:

[0058] (1) is exactly the same as the step (1) in embodiment 1, obtains the PVA aqueous solution that concentration is 50g / L;

[0059] (2) exactly the same as step (2) in embodiment 1, obtain the mixed aqueous solution of PVA and graphene;

[0060] (3) Put the mixed aqueous solution of PVA and graphene in the ultrasonic equipment, use high-purity nitrogen to discharge the air in the container, turn on the ultrasonic, set the power to 1000W, control the temperature at 80°C, the frequency is 27kHz, and the ultrasonic treatment time For 8 hours, the ultrasonic treatment product was obtained;

[0061] (4) is exactly the same as step (2) in embodiment 1, obtains the graphene of PVA functionalization.

[0062] Solubility experiments on the PVA unfunctionalized graphene prepared above show that the PVA functionalized graphene can be uniformly dispersed in water to form a black disp...

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Abstract

The invention discloses an ultrasonic-assisted method for preparing polymer functionalized graphene. According to the method, high-intensity ultrasonic equipment is adopted to carry out ultrasonic irradiation on a mixed solution of a polymer and graphene. By high-intensity ultrasound, on one hand, graphene layers are broken to induce the generation of a lot of reaction sites; on the other hand, a reactive macromolecular chain is generated by ultrasonic degradation of the polymer, and the reactive macromolecular chain is rapidly grafted on the graphene reaction sites, thus realizing in situ polymer functionalization of graphene. It is proved through experiments that the polymer functionalized graphene obtained by the method has high grafted polymer content and has good dispersibility and stability in a solvent and a polymer matrix. A polymer / functionalized graphene nanocomposite material prepared by the utilization of the polymer functionalized graphene has excellent mechanical properties. Therefore, in comparison with the prior art, the method is an ideal method for realizing polymer functionalization of graphene and has latent application values.

Description

technical field [0001] The invention relates to the technical field of modification of graphene, in particular to a method for ultrasonically assisted preparation of polymer functionalized graphene. Background technique [0002] Graphene is a single-atom-thick two-dimensional carbon atom layered crystal, which is considered to be the basic structural unit of fullerene, carbon nanotube and graphite. Its special thermal, mechanical and conductive properties make graphene promising in the preparation of composite materials. It becomes an ideal filler to improve the thermal, mechanical and electrical properties of the polymer matrix. [0003] However, graphene with a complete structure is a two-dimensional crystal composed of six-membered benzene rings without any unstable bonds. It has high chemical stability and an inert surface, so the interaction with polymers is weak. Moreover, there is a strong van der Waals force between graphene sheets, which is prone to aggregation, ma...

Claims

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Application Information

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IPC IPC(8): C09C1/46C09C3/10C09C3/04C08K9/04C08K9/00C08K3/04C08L29/04
Inventor 郑文革翟文涛沈斌
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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