Chemical cellulose-based fibers of decreased flammability

Korovnikova, Natalia; Dubyna, Oleksandr; Oliinik, Volodymyr; Svishchova, Yana

doi:10.15587/1729-4061.2020.214507

Cited by 3 publications

(5 citation statements)

References 13 publications

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“…Since air is considered a compressible fluid in this context, the equation of D. Bernoulli, used for the flow of an ideal liquid, can be successfully used in the case of any gas flow with minor pressure changes [12]. In particular, with small differences in temperature between the transported air and the environment, it is possible to consider the difference in geometric altitude levels, and the equation of D. Bernoulli can be represented as (13):…”

Section: Resultsmentioning

confidence: 99%

“…Experiments conducted in laboratory conditions have shown that the air permeability index for samples before exposure to pressure and moisture is on average, 67.16 cm 3 /cm 2 s (Table 6) [13]. This indicator, after applying pressure and moisture with a mass of 5 kg, decreases to a value of 46.98 cm 3 / cm 2 s; after pressing with a 10 kg press, the device shows 43.74 cm 3 /cm 2 s; after a press load of 15 kg, air permeability decreases to 40.77 cm 3 /cm 2 s; after 20 kg of load, air permeability reduced to 38.01 cm 3 / cm 2 s. It follows that after applying pressure paired with moisture, the air permeability index decreases by 36.95%.…”

Section: Resultsmentioning

confidence: 99%

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Examination of the influence of hydrothermal treatment of textile materials on their physical and mechanical properties and development of innovative technology

Tashpulatov,

Bakhriddinova,

Nutfullaeva

et al. 2023

Scientific Herald of Uzhhorod University Series Physics

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Relevance. Investigation in the field of textile materials and the effect of processing on their properties, is relevant, as it helps to develop more effective processing methods and increase the resistance of textile materials to the influence of various factors, which is important for both manufacturers and consumers. Purpose. The purpose of the study was to examine the effect of hydrothermal processing of textile materials on their physical and mechanical properties, develop a technology for the production of clothing using a new method (device) of press equipment for hydrothermal processing of composite material. Methodology. The analysis method was used during the study, and an experiment was also conducted in which the temperature of the steam that did not fall below 160°C was used when processing the selected fabric samples, and the temperature of the working bodies of the press for forming the back was at least 110°C. Results. As a result, the influence of hydrothermal treatment on the properties of textile materials was examined in detail and established. Having analysed the existing method of hydrothermal treatment using a vacuum unit, it was established that the conventional method of treatment leads to a substantial decrease in fabric thickness, breaking load and air permeability. It was also noted that during the hydrothermal treatment of the material, it is exposed under the influence of pressure. This leads to densification and flattening of the threads inside the material, creating flat areas, which causes adverse changes in the physical and mechanical characteristics of the fabric. Conclusions. These factors indicate a potential deterioration in the quality and durability of textile products, which can increase the percentage of defects and negatively affect consumer satisfaction. This study also points to the prospects of using a vacuum installation in hydrothermal treatment, which allows preserving the desired properties of materials, improving the quality of the final products. The practical importance of the results of this study lies in the possibility of improving the quality of textile products and reducing the damage to materials, which is important for ensuring longer operation of textile products and increasing consumer satisfaction

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Examination of the influence of hydrothermal treatment of textile materials on their physical and mechanical properties and development of innovative technology

Tashpulatov,

Bakhriddinova,

Nutfullaeva

et al. 2023

Scientific Herald of Uzhhorod University Series Physics

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“…Weighed portions of metal salts were selected in such a way that the number of metal ions in them corresponded to their content in HMCC [23,24]. Simultaneously, for comparison, some studies were carried out in the absence of a catalyst.…”

Section: Methodsmentioning

confidence: 99%

“…There are slight differences in the activity of identical HMCC with CG and NAG complexites. This may be due to the presence in the NAG matrix of a wider range of functional groups involved in the catalytic process, as well as due to the differences in the solvation characteristics of complexites [24]. A significant decrease in the activity of cobalt HMCC (pH 12.2) is probably due to some change in the redox potential of these complexes.…”

Section: The Ability Of Reducing the Concentration Of Hydrogen Sulfid...mentioning

confidence: 99%

Catalytic Activity of Fibrous Complexites

Korovnikova

Oliinik

Svishheva

2022

KEM

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The ecological situation in the world requires the solution of environmental problems associated with the processes of wastewater treatment, hydrogen sulfide pollution of various industrial facilities in order to remove such harmful impurities. The unpleasant odor that appears in industrial and adjacent waste processing areas is a constant concern for the protection of the environment. To solve these problems, it is advisable to use selective sorbents - complex. The introduction of metal ions into complex fibers due to the formation of a coordinated bond between the groups of the metal and the polymer ligand gives high molecular weight complex compounds. The operational and selective properties of the materials based on high-molecular-weight complex compounds can be determined by the type of metal ion introduced into macromolecules, the nature of the polymer chain, and thermodynamic stability. By changing the action of the above factors, complexites can be synthesized for use as highly selective catalysts for various chemical processes. The paper presents data on the catalytic activity of fibers with Cu2+, Co2+, Ni2+ ions with complexing fibers containing carboxyl, amidoxime, hydroxamic groups, using the example of the decomposition of hydrogen peroxide and oxidation of H2S, Na2S. An inhibitory effect on the oxidation of fiber functional groups in the pH range 5.5 - 12.5 was revealed. The operational and selective properties of materials based on complexites can be determined by the type of metal ion introduced into the macromolecules, by the nature of the polymer chain. By changing the action of the above factors, complexites can be synthesized to be used as highly selective catalysts for various chemical processes. It was found that the catalytic activity of the complex depends on pH, the stereochemistry of the coordination centers in the fiber matrix and significantly exceeds the activity of model low-molecular-weight complex compounds.

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“…In addition, the intrinsic characteristics of biodegradability (Vikman et al, 2015), renewability at relatively low cost (Ardanuy et al, 2015), and versatile chemical reactivity (Vuoti et al, 2013) have made desirable cellulose material for many additional potential applications. However, the high hydrophilicity (Rol et al, 2019a) and low thermal resistance (Korovnikova et al, 2020) are limiting factors for certain applications.…”

Section: Introductionmentioning

confidence: 99%