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Method for grafting hyperbranched aromatic polyamide to surface of carbon fibers

A polyaramid, surface grafting technology, applied in the direction of carbon fiber, fiber treatment, textile and paper making, etc., can solve the problem of low interfacial bonding strength, and achieve the effect of improving compatibility, improving application potential and increasing N content

Active Publication Date: 2017-11-03
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low interfacial bonding strength of existing carbon fiber composite materials, and provide a method for grafting hyperbranched polyaramid on the surface of carbon fibers

Method used

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  • Method for grafting hyperbranched aromatic polyamide to surface of carbon fibers
  • Method for grafting hyperbranched aromatic polyamide to surface of carbon fibers
  • Method for grafting hyperbranched aromatic polyamide to surface of carbon fibers

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specific Embodiment approach 1

[0052] Specific embodiment 1: This embodiment is a method for grafting hyperbranched polyaramid on the surface of carbon fiber, which is specifically completed according to the following steps:

[0053] 1. Extraction treatment of carbon fiber:

[0054] Put the carbon fiber into a Soxhlet extractor filled with acetone, and then heat the acetone to 75°C~85°C. The acetone is continuously steamed out and condensed in the Soxhlet extractor, so that the impurities on the surface of the carbon fiber are continuously obtained in the distilled acetone Cleaning, the cleaning time is 48h-72h, then the carbon fiber is taken out and placed in an oven at a temperature of 70℃~80℃ to dry for 12h-24h to obtain carbon fiber with epoxy coating removed;

[0055] 2. Oxidation:

[0056] ①. Immerse the carbon fiber from which the epoxy coating has been removed into a potassium persulfate / silver nitrate mixed aqueous solution, heat it to 60℃~80℃, and then keep the temperature at 60℃~80℃ for 1h~2h to obtain t...

specific Embodiment approach 2

[0090] Specific embodiment two: this embodiment is different from specific embodiment one in that: the dried oxidized carbon fiber and LiAlH described in step three 4 The mass ratio is (1~1.5):(0.1~0.2). The other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0091] Specific embodiment three: This embodiment is different from specific embodiment one or two in that the mass ratio of the dry oxidized carbon fiber described in step three to the volume ratio of hydrochloric acid with a concentration of 1.5 mol / L to 2 mol / L is (1g~1.5g): (150mL~200mL). The other steps are the same as the first or second embodiment.

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Abstract

The invention discloses a method for grafting hyperbranched aromatic polyamide to the surfaces of carbon fibers and relates to a method for grafting a polymer to the surfaces of the carbon fibers. The invention aims at solving the problem of low interface bonding strength of an existing carbon fiber composite material. The method comprises the following steps: firstly, carrying out extraction treatment on the carbon fibers; secondly, oxidizing; thirdly, carrying out reducing treatment on the carbon fibers; fourthly, carrying out silanization treatment on the carbon fibers; fifthly, preparing a mixture, and heating to obtain the carbon fibers of which the surfaces are grafted with the hyperbranched aromatic polyamide. Compared with untreated carbon fibers, the carbon fibers of which the surfaces are grafted with the hyperbranched aromatic polyamide, prepared by the method disclosed by the invention, have the advantages that the content of N is increased from original 1.11 percent of the untreated carbon fibers to 2.7 to 4 percent, and surface energy is improved by 100.5 percent or above, and the interfacial shear strength is improved by 65 percent. According to the method disclosed by the invention, the carbon fibers of which the surfaces are grafted with the hyperbranched aromatic polyamide can be obtained.

Description

Technical field [0001] The invention relates to a method for grafting polymers on the surface of carbon fibers. Background technique [0002] In recent years, fiber-reinforced materials such as polymer fibers, glass fibers (GF) and carbon fibers (CF) have been widely used. Among them, CF combines excellent mechanical properties and electrical conductivity, making it an ideal reinforcement material for advanced composite materials. [0003] Carbon fiber reinforced polymer (CFRP) composite materials provide consumers with more alternatives in the material market due to their unique properties: light weight and high strength. It is generally believed that the performance of CFRP is highly dependent on the interface performance, which determines the way the load is transferred from the matrix to the fiber. Therefore, the uniform distribution of CF in the matrix and sufficient interface bonding between CF and the matrix are necessary to enhance performance. However, the incompatibili...

Claims

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Application Information

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IPC IPC(8): D06M15/59D06M11/01D06M11/05D06M11/13D06M11/50D06M11/65D06M13/11D06M13/127D06M13/144D06M13/292D06M13/342D06M13/513D06M101/40
CPCD06M11/01D06M11/05D06M11/13D06M11/50D06M11/65D06M13/11D06M13/127D06M13/144D06M13/292D06M13/342D06M13/513D06M15/59D06M2101/40
Inventor 宋国君王刚马丽春丛龙亮宋文哲
Owner QINGDAO UNIV
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