Study On Surface Modification Of Aramid Fiber

< p > because the bonding property between aramid fiber and matrix is poor, and when the fiber epidermis is destroyed, the mechanical properties decrease rapidly. In order to make the aramid fiber excellent performance, we must modify the aramid fiber, improve the surface bonding property of aramid fiber, and enhance the bonding status with the substrate interface.

The surface modification of aramid fiber is mainly aimed at reducing the degree of orientation of the fiber surface and increasing the number of active groups on the surface of the fiber.

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< p > physical modification is to improve the physical and chemical state of the fiber surface by means of physical technology such as plasma, electron beam and ultrasonic wave, so as to enhance the interaction between the fiber and the substrate, and ultimately improve the interface performance between the fiber and the substrate.

The principle is to infiltrate, etch and purge the surface of the fiber, introduce polar or active groups such as hydroxyl and carbonyl on the fiber surface, form some active centers on the surface of the fiber, and then initiate grafting reaction to improve the properties of aramid fiber.

Surface coating technology, plasma technology and gamma ray modification technology are the main means.

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< p > > a href= "//www.sjfzxm.com/news/index_c.asp" > chemical modification < /a > the method is to introduce amino, hydroxyl, carboxyl or other polar or reactive groups on the surface of the fiber through nitrification / reduction and Chlorsulfonated reaction. The bonding strength of a href= "//www.sjfzxm.com/news/index_c.asp" > fiber > /a > matrix is improved by chemical bonding or polar action.

It includes surface etching technology, surface grafting technology and coupling agent modification technology.

In the various ways of modification of aramid fiber, surface grafting technology is probably the most widely used technology by chemists.

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< p > the premise of aramid modification is to significantly improve the adhesive properties of the fiber and resin matrix without damaging the "a href=" //www.sjfzxm.com/news/index_c.asp "fiber body < /a > strength or little influence on the bulk strength of the fiber.

Although there are many methods that are now being studied by technical personnel in various countries, there are very few methods that really have outstanding effects and are suitable for industrial mass production.

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< p > physical modification method is easier to realize industrial operation than chemical modification. In the future, further research should be strengthened in order to improve the properties of aramid fiber and its composite materials.

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< p > chemical modification of aramid fiber is more effective and can improve the interfacial shear properties of composites.

However, because the chemical method requires the corresponding reaction methods, reaction solvents, reaction time, reaction temperature and other reaction conditions, it involves workshop corrosion, environmental safety and hygiene, as well as subsequent washing, drying and rewinding.

In order to develop reactive reagents with high activity and control the reaction conditions of fiber modification, continuous processing will be the research direction in the future.

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