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Preparation method for improving interfacial properties of carbon fiber composite material

A technology of interfacial properties and composite materials, applied in fiber processing, textiles and papermaking, etc., can solve the problems of unstable polar groups, incomplete reaction, long reaction time, etc., to improve interfacial properties, easy handling, grafting high rate effect

Inactive Publication Date: 2012-10-10
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above method has the disadvantages of long reaction time, incomplete reaction, and poor environmental protection. To a large extent, the polar groups obtained from the reaction are unstable and will disappear or mutate over time.

Method used

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  • Preparation method for improving interfacial properties of carbon fiber composite material
  • Preparation method for improving interfacial properties of carbon fiber composite material
  • Preparation method for improving interfacial properties of carbon fiber composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The invention provides a preparation method for improving the interfacial properties of carbon fiber composite materials, the steps of which are:

[0026] The first step, preparation of plasma-activated carbon fibers:

[0027] Put 2g of purified carbon fibers in the plasma reaction chamber, and inject high-purity argon with a pressure of 14.5Pa and a gas flow of 3L / min for 5 minutes; then, a gas pressure of 14.5Pa and a gas flow of 30ml / min of pure oxygen for 5 minutes; discharge treatment at a power of 110W for 90s to obtain plasma-activated carbon fibers;

[0028] Second step, the preparation of maleic anhydride xylene solution:

[0029] Dissolve 7g of maleic anhydride in 100ml of xylene in a water bath at 60°C to obtain a solution of maleic anhydride in xylene;

[0030] The third step, activated carbon fiber ultrasonic infiltration:

[0031] Add the plasma-activated carbon fibers obtained in the first step to the maleic anhydride xylene solution obtained in the s...

Embodiment 2

[0042] Change the amount of maleic anhydride in the second step of embodiment 1 to 5.0g, other conditions and steps are exactly the same as in embodiment 1, adopt the method identical with embodiment 1, detect and obtain the grafting rate of gained product 10.3% , the interfacial strength (IFSS) of the composite material is 55.4MPa.

Embodiment 3

[0044] Change the amount of maleic anhydride in the second step of embodiment 1 to 3.0g, other conditions and steps are exactly the same as in embodiment 1, adopt the method identical with embodiment 1, detect and obtain the grafting rate of gained product 6.8% , the interfacial strength (IFSS) of the composite is 45.3MPa.

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Abstract

The invention provides a preparation method for improving interfacial properties of a carbon fiber composite material. The method is characterized by comprising the steps of firstly, preparing plasma activated carbon fiber; secondly, preparing a maleic anhydride dimethylbenzene solution; thirdly, subjecting the activated carbon fiber to ultrasonic infiltration; fourthly, performing grafting of maleic anhydride; and fifthly, purifying a crude product of the plasma activated carbon fiber which the maleic anhydride is grafted to. The method has the advantages that the free radicals formed on the surface of carbon fiber are processed through plasmas of argon-oxygen mixed gas, so that the polymerization reaction speed of the free radicals and the maleic anhydride is accelerated and the degree us improved; the reaction speed is accelerated through a high temperature, and the grafting reaction time is only 3 min to 7 min, so that grafting carbon fiber which is uniform in surface coating and high in grafting rate and has certain quantities of anhydride groups is obtained, the grafting carbon fiber and epoxy resin are subjected to reaction well, and the interfacial properties of the composite material is improved; and the method is energy-saving, environment-friendly and convenient to process.

Description

technical field [0001] The invention relates to a preparation method for improving the interfacial properties of carbon fiber composite materials by using plasma activation grafted maleic anhydride, and belongs to the technical field of carbon fiber surface modification. Background technique [0002] Carbon fiber has a series of excellent properties such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, electrical conductivity, heat transfer and small thermal expansion coefficient, and is widely used in fiber reinforced resin matrix composites. The surface of carbon fiber is inert, the specific surface area is small, the edge active carbon atoms are few, the surface energy is low, and the wettability of resin and the adhesion of the two-phase interface are poor. Therefore, people modify the surface of carbon fibers to improve the interfacial properties of their fiber-reinforced resin mat...

Claims

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Application Information

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IPC IPC(8): D06M14/36D06M14/18
Inventor 张焕侠李炜
Owner DONGHUA UNIV
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