Chemical cellulose-based fibers of decreased flammability

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.214507

Keywords:

fire protection of cellulose fiber, flame retardants, thermal destruction, scanning electron microscop

Abstract

The studies reported here have made it possible to determine the optimal ways of fire protection, in which the samples of modified complexite have reduced flammability. The sample with the ions of molybdenum (VI), treated with phosphoric acid, had the highest magnitude of oxygen index among five modified samples of the fiber. This is the most fire-protected sample, which contains three types of flame retardants: nitrogen (amidoxime groups of complexite, phosphorus (treatment with phosphoric acid) and molybdenum (VI). The obtained data indicate the chemical interaction of flame retardant with complexite.

The morphology of fibers and the process of their destruction are influenced by the introduction of flame retardants. Scanning electronic microphotographs show the existence of a morphological change of the surface at modification of the complexite samples with flame retardant. The introduction of flame retardant into complexite affects the process of thermal destruction of the samples in the air and argon media. At the same time, the introduction of molybdenum (VI) significantly reduces the thermal stability of fibers. It is likely that processes of thermal destruction can be catalyzed by metals both in the air medium and in the argon medium. The magnitudes of order of reaction of thermal decomposition at the transition from a fiber sample treated only with acids to the samples of complexite containing molybdenum (VI) decreases up to 0.38. At the same time, the values of activation energies E, kcal/mol, and the enthalpy of the process of thermal destruction of complexite DH, kcal/mole also decrease. The mechanical properties of fibers at the introduction of flame retardants into the fiber composition change insignificantly. Depending on the composition of flame retardants, rupture load decreases by 6–11 %, lengthening of the samples decreases by 6–16 %.

Thus, there are some grounds to suggest that it is possible to create fibrous materials based on cellulose with predetermined properties of reduced flammability.

Author Biographies

Natalia Korovnikova, National University of Civil Defence of Ukraine Chernyshevska str., 94, Kharkiv, Ukraine, 61023

PhD, Associate Professor

Department of Fire and Technological Safety of Facilities and Technologies

Oleksandr Dubyna, Kharkiv National Agrarian University named after V. V. Dokuchaev p/o “Dokuchaevske-2”, Kharkiv dist., Kharkiv reg., Ukraine, 62483

PhD, Associate Professor

Department of General Chemistry

Volodymyr Oliinik, National University of Civil Defence of Ukraine Chernyshevska str., 94, Kharkiv, Ukraine, 61023

PhD, Associate Professor

Department of Fire and Technological Safety of Facilities and Technologies

Yana Svishchova, Kharkiv National Agrarian University named after V. V. Dokuchaev p/o “Dokuchaevske-2”, Kharkiv dist., Kharkiv reg., Ukraine, 62483

PhD, Associate Professor

Department of General Chemistry

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Published

2020-10-23

How to Cite

Korovnikova, N., Dubyna, O., Oliinik, V., & Svishchova, Y. (2020). Chemical cellulose-based fibers of decreased flammability. Eastern-European Journal of Enterprise Technologies, 5(6 (107), 33–39. https://doi.org/10.15587/1729-4061.2020.214507

Issue

Vol. 5 No. 6 (107) (2020): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2020 Natalia Korovnikova, Oleksandr Dubyna, Volodymyr Oliinik, Yana Svishchova

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