METHOD OF PRODUCING STRONG AND CURRENT-CONDUCTING FIBER BY DRAWING FILMS FROM CARBON NANOTUBES Russian patent published in 2019 - IPC D01F9/12 B82Y40/00 B82B3/00 

FIELD: nanotechnologies.

SUBSTANCE: invention relates to nanotechnology and can be used in production of specialized clothes, smart fabrics, sensors, light composite materials, flexible and extensible electronics. First, film is made consisting of randomly oriented carbon nanotubes, with thickness of 1 nm to 100 mcm, and length and width of more than 1 mm. Then it is immersed in solvent or solvent is applied on its surface during time required for complete film coating with solvent. Force is applied to at least one section of the film, drawing it from the solvent to produce a fiber. Organic solvent used is ethanol, an ethanol-aqueous solution, butanol, isopropanol, methanol, acetone, acetonitrile, dimethylsulphoxide or dimethylformamide. In process of drawing film from solvent it can be additionally twisted and / or stretched. Film can be placed on a solid substrate and when pulled, it is separated from the substrate. Obtained fiber is held in elongated state and dried until complete evaporation of solvent, providing hardening, and to accelerate evaporation of solvent, fiber can be heated. At thickness of film used for production of fiber from 40 to 180 nm and width of 5 mm specific resistance of fiber from 0.3⋅10^-4 up to 1.4⋅10^-4 Ohm⋅m, and its specific strength from 2 to 20 MN⋅m/kg. Surface of obtained fiber can be coated with non-conductive polymer material, for example polyvinyl alcohol, polycarbonate, ABS-plastic, polystyrene, epoxy resins, polyurethanes or polydimethylsiloxane.

EFFECT: obtained fiber of carbon nanotubes has higher specific electrical conductivity and strength compared to film used for its production.

18 cl, 7 dwg, 5 ex