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Method for performing amino functionalizing on carbon fiber surface

A surface amino group and carbon fiber technology, which is applied in carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems of amine group consumption and less residual amine group, and achieve mild conditions, increase amine group content, and good controllability Effect

Inactive Publication Date: 2015-12-02
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN103572591A uses this method to modify the surface of carbon fibers, but during the reaction of dopamine, a large number of amine groups are consumed, resulting in less residual amine groups

Method used

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  • Method for performing amino functionalizing on carbon fiber surface
  • Method for performing amino functionalizing on carbon fiber surface
  • Method for performing amino functionalizing on carbon fiber surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 100mg of polyethyleneimine with a molecular weight of 10000 and 200mg of dopamine (mass ratio is 0.5:1, the concentration of dopamine is 2mg / ml), dissolve in 100ml of Tris buffer solution with pH 8.5, then immerse 5gCF in the reaction system , stirred magnetically for 24 h at room temperature. After the treatment, it was fully washed with deionized water, and dried in a vacuum oven at 60° C. for 24 hours. The scanning electron micrograph of the CF prepared in this embodiment is as follows: figure 1 As shown, the scanning electron micrographs of unmodified CF are as figure 2 As shown, it can be seen that the modified CF surface is covered with a uniform polymer coating. The IFSS between the CF prepared in this example and EP, MPP, and PA6 are 72.8MPa, 32.3MPa, and 47.5MPa respectively, which are 238.7%, 316.7%, and 212.1% of the IFSS between the unmodified CF and the above three resins, Interface enhancements are noticeable.

Embodiment 2

[0032] The difference between this embodiment and embodiment 1 is that the polyethyleneimine molecular weight used is 15000, and the others are the same as embodiment 1. The IFSS between the CF prepared in this example and EP, MPP, and PA6 are 65.3MPa, 29.7MPa, and 42.7MPa respectively, which are 214.1%, 291.2%, and 190.6% of the IFSS between the unmodified CF and the above three resins, Interface enhancements are noticeable.

Embodiment 3

[0034] The difference between this embodiment and embodiment 1 is that the mass ratio of polyethyleneimine and dopamine used is 2:1, and the others are the same as embodiment 1. The IFSS between the CF prepared in this example and EP, MPP, and PA6 are 70.2MPa, 35.6MPa, and 48.6MPa, respectively, which are 230.2%, 291.2%, and 217.0% of the IFSS between the unmodified CF and the above three resins, Interface enhancements are noticeable.

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Abstract

The invention relates to a method for performing amino functionalizing on a carbon fiber surface. The method comprises the steps that the fiber surface is coated with a copolymer coating containing a large amount of active amino by utilizing a Michael addition and Schiff base reaction of dopamine and poly-amino molecules through a one-step solution dipping method. Compared with the prior art, the method is simple in technology and mild in condition, does not damage a fiber body structure and can effectively increase active groups of the carbon fiber surface, and therefore the interface bonding property between fiber and resin is improved.

Description

technical field [0001] The invention belongs to the field of carbon material modification, and in particular relates to a method for modifying the surface of carbon fibers. Background technique [0002] As a new generation of high-performance fibers, carbon fiber (CF) has high specific strength, high specific modulus, good creep resistance, low density, good thermal and chemical stability, low thermal expansion coefficient and high thermal and electrical conductivity. Series of excellent performance, its composite materials have been widely used in aerospace, military, transportation, medical and sporting goods and other fields. [0003] The performance of carbon fiber reinforced composites is determined by the properties of CF and the matrix itself and the interface bonding performance between the two. The interfacial phase is a very important microstructure in the composite material. As a "bridge" between the reinforcement CF and the matrix, it has a non-negligible impact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/61D06M13/332D06M15/59D06M15/03C08K9/04C08K7/06C08L63/00C08L61/06C08L79/08C08L77/02C08L67/00C08L77/00D06M101/40
Inventor 刘媛杨斌张雪王新灵方忆超
Owner SHANGHAI JIAO TONG UNIV
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