A method for preparing aramid nanofibers

Abstract

The invention discloses a method for preparing aramid nanofibers. Adding para-aramid fibers and KOH to a DMSO solution to obtain a mixed system of para-aramid fibers, KOH and DMSO; adding para-aramid fibers, KOH and The mixed system of DMSO was placed in an ice-water bath for ultrasonic treatment to obtain a para-aramid fiber suspension A; water was added to the para-aramid fiber suspension A to obtain a para-aramid fiber suspension B; After the fiber suspension B is sealed and stirred, the ANFs / DMSO solution is obtained; the ANFs / DMSO solution is titrated with a cationic standard solution by colloid titration, and whether the reaction end point is judged by the amount of the cationic demand, and if the reaction end point is reached, the To obtain aramid nanofibers, if the reaction end point is not reached, the previous step is repeated until the reaction end point is reached. The invention greatly shortens the reaction time, increases the reaction concentration, remarkably improves the reaction efficiency, and is beneficial to realize large-scale production.

Description

technical field [0001] The invention belongs to the field of polymer nanomaterials, in particular to a method for preparing aramid nanofibers. Background technique [0002] Aramid Nanofibers (ANFs), as an emerging polymer nanofiber with excellent performance in recent years, is similar to the most widely used inorganic nano-reinforced materials (such as nanoparticles, nanowires, nanotubes, and nanosheets) in the field of materials. , has a unique nanoscale structure, large aspect ratio and specific surface area, and at the same time retains the excellent mechanical properties and temperature resistance of aramid macroscopic fibers, bringing it mechanical properties, electrical properties and The optical properties make it a new type of "construction unit" for the construction of macroscopic composite materials, which plays an important role in interface enhancement and is widely used in advanced materials such as composite material reinforcement, electrical insulation, high-...

AI Technical Summary

Problems solved by technology

In order to overcome the shortcomings of the existing deprotonation reaction in the preparation of aramid nanofibers, such as long reaction period, low reaction concentration, and determination of the quantitative reaction end point, the invention is easy to operate, can quickly and successfully prepare aramid nanofibers, and greatly shortens the reaction time. At the same time, it can realize the preparation of high-concentration aramid nanofibers and realize the quantitative judgment of the reaction end point, which is expected to promote the large-scale production and diversified applications of aramid nanofibers

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