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Graphene composite material and preparation method thereof

A technology of composite materials and graphene, which is applied in the field of composite materials, can solve the problems of graphene composite materials with unobvious mechanical properties, uniform dispersion of graphene, easy agglomeration, etc., and achieve the effect of excellent interface compatibility and good mechanical properties

Active Publication Date: 2011-08-17
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the graphene used in this method is easy to agglomerate in the process of preparing the graphene composite material, and it is difficult to uniformly disperse the modified graphene into the polyolefin matrix by mechanical dispersion, so that the mechanical properties of the graphene composite material prepared The improvement is not obvious

Method used

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  • Graphene composite material and preparation method thereof
  • Graphene composite material and preparation method thereof
  • Graphene composite material and preparation method thereof

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preparation example Construction

[0025] The invention discloses a preparation method of a graphene composite material, comprising:

[0026] Step a) reacting graphene and organosilane in a mixed solution of organic solvent and water to obtain organosilane-modified graphene;

[0027] Step b) mixing the organosilane-modified graphene with a polymer to obtain a graphene composite material.

[0028] According to the present invention, the organic solvent in the step a) is preferably methanol, ethanol, acetone, butanone, chloroform, dichloroethane, carbon tetrachloride, cyclohexane, benzene, toluene, xylene, tetrahydrofuran, dimethyl sulfoxide, N,N-dimethylformamide, N,N-dimethylacetamide or N-methylpyrrolidone. The reaction temperature in step a) is preferably 25-150°C, more preferably 30-130°C, most preferably 50-100°C. The reaction time of step a) is preferably 1-24 hours, more preferably 2-20 hours, most preferably 5-15 hours. Said addition of water and organosilane preferably includes ultrasonic dispersion....

Embodiment 1

[0042] Add 0.5g of graphene powder into 100ml of N,N-dimethylformamide, ultrasonically disperse at a frequency of 20 Hz for 2 hours, then add 0.5g of γ-aminopropyltrimethoxysilane and 0.5g of distilled water at 25°C Stir mechanically and react for 24 hours. After the reaction, use suction filtration to obtain a black powdery solid product, namely organosilane-modified graphene;

[0043] Add 0.3 g of the above organosilane-modified graphene into 80 ml of N, N-dimethylformamide, then add 10 g of polyurethane, ultrasonically disperse at a frequency of 20 Hz for 2 hours, and then mechanically stir for 24 hours to remove N, N-dimethylformamide. Methylformamide, to obtain graphene composites.

[0044] The infrared spectrogram of the graphene composite material prepared in this embodiment is as follows figure 1 shown, from figure 1 It can be seen that the graphene composite material prepared in this example has Si-O bonds, indicating that organosilanes with specific functional grou...

Embodiment 2

[0046] Add 0.5g of graphene powder into 100ml of N,N-dimethylformamide, ultrasonically disperse at a frequency of 100 Hz for 5 minutes, add 10.0g of γ-aminopropyltriethoxysilane and 10.0g of distilled water, at 150°C Stir mechanically, react for 2 hours, and use suction filtration after the reaction to obtain a black powdery solid product, that is, organosilane-modified graphene;

[0047] Add 0.3 g of the above organosilane-modified graphene to 80 ml of N,N-dimethylformamide, add 10 g of polyurethane, disperse ultrasonically at a frequency of 100 Hz for 5 minutes, then mechanically stir for 2 hours to remove N,N-dimethylformamide base formamide to obtain organosilane-modified graphene-polyurethane composites.

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Abstract

The embodiment of the invention discloses a graphene composite material and a preparation method thereof. In the method, graphene and organosilane are taken as reactants; the organosilane undergoes a hydrolysis reaction, and then undergoes a dehydration condensation reaction with hydroxyl on the graphene so as to obtain organosilane-modified graphene. Compared with the prior art, the organosilane-modified graphene expands the interlayer spacing of graphene, so that the organosilane-modified graphene is difficultly agglomerated when the organosilane-modified graphene is mixed with a polymer, the organosilane-modified graphene is uniformly dispersed in a polymer substrate, and a prepared graphene composite material has an enhanced effect. Moreover, the organosilane-modified graphene undergoes chemical bonding or intermolecular force with the polymer, so that the prepared graphene composite material has excellent interface compatibility. Proved by experiment results, the graphene composite material prepared in the invention has high mechanical property.

Description

technical field [0001] The invention relates to the technical field of composite materials, more specifically, to a graphene composite material and a preparation method thereof. Background technique [0002] Graphene is a new allotrope of carbon discovered in recent years, which has a two-dimensional planar structure in which carbon atoms are arranged in a hexagonal network. In 2004, Geim and Novosolevo of the University of Manchester in the UK prepared for the first time monoatomic sheets of graphene with a honeycomb lattice structure (Novoselov K.S., Geim A.K., et al.Science 2004, 306, 666-669). Due to its typical two-dimensional structure, graphene has good mechanical, electrical, optical and thermal properties, such as room temperature Hall effect and high carrier mobility, reaching 200000em 2 / Vs; ultra-high mechanical strength of 130GPa; good thermal conductivity of 3000W / mK (Xu Z., Gao C. Macromolecules 2010, 43, 6716-6723). Due to the above properties, graphene has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L101/00C08K9/06C08K3/04C08L23/06C08L23/12C08L75/04C08L27/06C08L25/06C08L69/00C08L67/04C08L67/02C08L77/06C08L77/02C08L63/00C08L63/10C08L75/14
Inventor 胡源王鑫宋磊邢伟义
Owner UNIV OF SCI & TECH OF CHINA
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