Increasing the Extreme Values of the Strength of Organoplastics by Treating the Aramid Fiber with Multilayer Carbon Nanotubes

• Published in: Russian journal of general chemistry Vol. 92; no. 3; pp. 526 - 529
• Main Authors: Shebanov, M. S., Ivanov, V. B., Kalinina, I. G., Bova, V. G., Shiyanova, L. B.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.03.2022; Springer; Springer Nature B.V
• Subjects: Carbon; Chemical technology; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Composite materials; Copolymers; Experiments; Extreme values; Filaments; Modernization; Multi wall carbon nanotubes; Multilayers; Nanotubes; Sulfuric acid; Ultimate tensile strength; Unidirectional composites; Weibull distribution; carbon nanotubes; para-aramid fiber; increasing the extreme strength of the composite
• ISSN: 1070-3632; 1608-3350
• DOI: 10.1134/S1070363222030227

The results of experiments aimed at increasing the strength of single filaments of a copolymer para-aramid fiber via treatment with multilayer carbon nanotubes (MWCNTs) were presented. The experiments were carried out at the production unit of AO NPP Termoteks. Multilayer carbon nanotubes produced by the Ural Research Institute of Composite Materials were used. MWCNTs were oxidized with a mixture of concentrated nitric and sulfuric acid. After rinsing to remove the acids the oxidized multilayer nanotubes were dispersed into an aqueous suspension via sonication. The resultant suspension was stable enough to be used in technological experiments at industrial production units. The Weibull distribution parameters for the arrays of the experimental data on the strength of the filaments of the original fiber and of those of the MWCNT-treated fiber sample were determined. Using the results obtained, the ultimate strength values were calculated by the Kelly-Tyson method for the composites made from the fiber samples tested. The extreme value of the strength of the unidirectional composite material based on the original fiber was 5.699 GPa, and that of the composite made from the fiber treated with the oxidized multilayer nanotubes, 6.270 GPa, thereby indicating a 10.2% increase. The results obtained show that the strength properties of both the fiber and the fiber-based composite can be improved without significant modernization of the cost-intensive chemical technology of para-aramid fiber, which highlights the technical and economic prospects associated with this direction.