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Method of chemically-grafting graphene oxide onto surface of carbon fiber

A surface chemistry, carbon fiber technology, used in carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems of carbon fiber surface inertness, low surface energy, poor thermal properties, etc., to improve the interface bonding quality and surface roughness increase , Improve the effect of surface wettability and adhesion

Inactive Publication Date: 2016-01-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the technical problems of high surface inertia, low surface energy, and poor mechanical and thermal properties of carbon fibers at present, and provides a method for chemically grafting graphene oxide on the surface of carbon fibers

Method used

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  • Method of chemically-grafting graphene oxide onto surface of carbon fiber
  • Method of chemically-grafting graphene oxide onto surface of carbon fiber
  • Method of chemically-grafting graphene oxide onto surface of carbon fiber

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specific Embodiment approach 1

[0027] Specific embodiment one: the method for chemically grafting graphene oxide on the surface of carbon fiber in this embodiment is carried out in the following steps:

[0028] 1. Prepare graphene oxide by improving Hummer's method:

[0029] a. Under the condition of ice-water bath, graphite powder and concentrated H with a mass concentration of 98% were successively 2 SO 4 、NaNO 3 and KMnO 4 Add it into a round-bottom flask and stir, heat up to 35°C, react for 7 hours, cool down, put it in an ice-water bath, and then add concentrated H with a mass concentration of 98% to the round-bottom flask 2 SO 4 and KMnO 4 , heated up to 35°C, and reacted for 12h;

[0030] b. Stop the reaction, add ice water to the round bottom flask, stir, pour into a large beaker, add H 2 o 2 until the color of the solution changes from dark brown to bright yellow, repeatedly washing with HCl and deionized water with a volume concentration of 5% to neutrality, and freeze-drying to obtain gra...

specific Embodiment approach 2

[0038] Specific embodiment two: this embodiment is different from specific embodiment one: the graphite powder described in step one a and the mass concentration that adds for the first time are the concentrated H of 98% 2 SO 4 The mass ratio is 1:40~50; the graphite powder and NaNO3 The mass ratio of is 2:1; Described graphite powder and the KMnO that add for the first time 4 The quality is 1:3. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0039] Specific embodiment three: this embodiment is different from specific embodiment one or two: the graphite powder described in step one a and the mass concentration that adds for the second time are the concentrated H of 98% 2 SO 4 The mass ratio of the graphite powder is 1:8~11; the graphite powder and the KMnO added for the second time 4 The quality is 1:1~1.5. Others are different from the first or second specific embodiment.

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Abstract

A method of chemically-grafting graphene oxide onto surface of carbon fibers. The invention relates to a surface modification method of the carbon fibers and aims to solve the problems of high surface inertia, low surface energy and poor mechanical and thermal performances of the carbon fibers in the prior art. The method includes following steps: (1) preparing graphene oxide through improved Hummer's method; (2) oxidizing the carbon fibers; (3) performing surface modification amination treatment to the carbon fibers; and (4) chemically-grafting the graphene oxide onto the surface of the carbon fibers. The surface of the carbon fibers is improved significantly in wettability and adhesivity and is significantly improved in roughness after grafting, so that the strength and toughness of the carbon fiber are significantly improved, wherein the strength is increased by 20-25% than carbon fiber raw filament and the toughness is increased by 35-40% that the carbon fiber raw filament. The method is used for surface modification of the carbon fibers.

Description

technical field [0001] The invention relates to a method for modifying the surface of carbon fibers. Background technique [0002] Carbon fiber (CF for short) is a new type of fiber material with high strength and high modulus fibers with a carbon content of more than 95%. It is a microcrystalline graphite material obtained by stacking organic fibers such as flake graphite microcrystals along the axial direction of the fiber, and undergoing carbonization and graphitization. Carbon fiber has many excellent properties, such as high axial strength and modulus, low density, high specific performance, no creep, ultra-high temperature resistance in non-oxidizing environment, good fatigue resistance, specific heat and electrical conductivity between non-metal and Between metals, the thermal expansion coefficient is small and has anisotropy, good corrosion resistance, good X-ray transparency, etc. However, due to the large surface inertia of carbon fiber, low surface energy, lack ...

Claims

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Application Information

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IPC IPC(8): D06M11/74D06M11/64D06M13/513D06M13/355D06M13/325D06M101/40
Inventor 安加东张幸红韩文波赵广东杜红菊周善宝程业红洪长青胡平
Owner HARBIN INST OF TECH
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