Method for grafting modified aramid fiber on surface of graphene oxide

A graphene surface and aramid fiber technology, which is applied in fiber treatment, fiber type, textiles and papermaking, etc., can solve the problems of reducing the performance of composite materials, poor wettability of aramid fibers, and poor interfacial adhesion of composite materials, etc. The effect of performance improvement

Active Publication Date: 2014-09-17
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0002]Aramid fiber is a new type of high-tech synthetic fiber with high tensile strength, high tensile modulus, low density, wear resistance, Excellent mechanical properties such as impact resistance, fatigue resistance, and dimensional stability; however, its surface is chemically inert, with high crystallinity, no amorphous region, and the large steric hindrance of the benzene ring makes it difficult for the hydrogen on the amide group to Reaction with other atoms; in addition, the smooth surface of the fiber, no physical meshing point with the matrix, etc., all lead to poor wettability of the aramid fiber, poor interfacial bonding with other matrix-made composite materials, and low interlayer shear strength, seriously reducing performance of composite materials

Method used

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  • Method for grafting modified aramid fiber on surface of graphene oxide
  • Method for grafting modified aramid fiber on surface of graphene oxide
  • Method for grafting modified aramid fiber on surface of graphene oxide

Examples

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Embodiment 1

[0024] This embodiment is carried out in the following manner:

[0025] 1. Preparation of aminated graphene oxide

[0026] Graphene oxide was prepared by the improved Hummer method, and the prepared graphene oxide was added to the aqueous solution, and ultrasonically treated for 30~60min to prepare a 1g / L graphene oxide suspension, adding 10ml of ethylenediamine, at 40°C, mechanically Stir and react for 24 hours, wash and dry to prepare aminated graphene oxide.

[0027] 2. Dopamine modified aramid fiber

[0028] Extract the aramid fiber with acetone for 24 hours, remove the sizing agent on its surface, wash, dry and set aside. Prepare a Tris-HCl buffer solution with pH=8.5, add dopamine hydrochloride, prepare a dopamine solution with a concentration of 2g / L, add aramid fibers into the dopamine solution, soak for 24 hours, wash with deionized water, and dry to obtain dopamine modified permanent aramid fiber.

[0029] 3. Grafting modified aramid fibers on the surface of grap...

Embodiment 2

[0032] The difference between this example and Example 1 is that the reaction temperature in step one is 60°C. The scanning electron microscope pictures of the aramid fibers grafted and modified on the surface of graphene oxide obtained in this embodiment are as follows: image 3 and 4 shown.

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Abstract

The invention discloses a method for grafting modified aramid fiber on the surface of graphene oxide and relates to a surface modification method of aramid fiber. In order to improve the binding force between the aramid fiber and a base material so as to improve the performance of the composite material, the method comprises the following steps: firstly, preparing amination graphene oxide; secondly, modifying the aramid fiber by using dopamine; and thirdly, grafting the modified aramid fiber on the surface of graphene oxide. The modified aramid fiber which is grafted by graphene oxide is obtained by grafting graphene oxide to the aramid fiber modified by dopamine. By virtue of the method, the Schiff base reaction is used; by virtue of a polydopamine coating containing a large quantity of active groups, graphene oxide with abundant amino groups on the surface is grafted to the surface of the aramid fiber modified by dopamine; the method has the characteristics of no high-temperature heating, simplicity, feasibility, environmental protection, nontoxicity and no damage to the aramid fiber; by virtue of the method, the aramid fiber with the surface uniformly coated by graphene oxide can be obtained; the boundary performance of the fiber and a resin matrix can be obviously improved.

Description

technical field [0001] The invention relates to a method for surface modification of aramid fibers, in particular to a method for non-destructive modification of aramid fibers. Background technique [0002] Aramid fiber is a new type of high-tech synthetic fiber with excellent mechanical properties such as high tensile strength, high tensile modulus, low density, wear resistance, impact resistance, fatigue resistance, and dimensional stability; but Its surface is chemically inert, with high crystallinity, no amorphous region, and the large steric hindrance of the benzene ring makes it difficult for the hydrogen on the amide group to react with other atoms; in addition, the fiber surface is smooth and has no physical contact with the matrix. Meshing points, etc., all lead to poor wettability of aramid fibers, poor interfacial adhesion with composite materials made of other substrates, and low interlaminar shear strength, which seriously reduces the performance of composite ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/74D06M101/36
Inventor 谢志民董庆亮刘宇艳吴松全
Owner HARBIN INST OF TECH
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