Preparation method of high-performance carbon nanotube fiber

Abstract

The invention relates to a preparation method of a high-performance carbon nanotube fiber, which comprises the following specific steps of: drawing a carbon nanotube film from a spinning carbon nanotube array; then, immersing the carbon nanotube film in a thermosetting polyamic acid / N-methyl pyrrolidone solution, and twisting to form a carbon nanotube / polyamic acid composite fiber; subsequently, curing the carbon nanotube / polyamic acid composite fiber so that polyamic acid in the composite fiber forms polyimide with a net type crosslinking structure; and finally preparing the carbon nanotube / polyimide composite fiber. The invention has the advantages of simple and easy process, low cost and easy realization of large-scale production; moreover, the prepared carbon nanotube composite fiber has excellent mechanical performance, the strength can reach 2.06 GPa, the tenacity is superior to that of carbon fiber, and the conducting property is maintained unchanged as compared with that of pure carbon nanotube fiber; meanwhile, the carbon nanotube composite fiber also has the operability of common yarn, so that the requirements on subsequent treatment processes of stretching, stranding, weaving and the like can be satisfied.

Description

technical field [0001] The invention relates to a preparation process of carbon nanotube fibers in the field of nano-micro composite materials, in particular to a method for preparing high-performance carbon nanotube fibers. Background technique [0002] Biological science and technology, information science and technology and nano science and technology are the mainstream of science and technology development in the 21st century. Carbon nanotubes are a typical one-dimensional nanomaterial with a perfect carbon hexagonal connection structure, high strength, ultra-light mechanical properties and special electrical properties formed by a unique graphite layer structure. For example, the tensile strength and elastic modulus of a single nanotube can reach 100GPa and 1TPa. Therefore, carbon nanotubes have become a hot spot of scientific research since their discovery in 1991, and have increasingly shown broad application prospects. However, in order to achieve engineering appli...

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Problems solved by technology

[0007] Wet spinning, the method is to mix carbon nanotube powder and polymer into a dispersion, and then solidify into fibers through a coagulation bath during the extrusion process, but the wet spinning operation process is relatively complicated and contains carbon The amount is low, and the mechanical stability of the fiber is not enough

Another wet method is to use the electrospinning method to spray the dispersed carbon nanotube solution from the spinneret under the action of an electric field to form nanoscale fibers containing nanotubes. Compared with the previous wet method Spinning, the carbon content is lower, and the carbon tubes are not well oriented in the fiber

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