TO THE QUESTION OF BIODEGRADATION OF POLYMERIC MATERIALS IN NATURAL ENVIRONMENTS (review)

Лаптев, А.Б.; Golubev, A. V.; Kireev, Dmitry; Nikolaev, E. V.

doi:10.18577/2307-6046-2019-0-9-100-107

Cited by 5 publications

(4 citation statements)

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“…Thus, the study identified the following crucial factors for steel 20 biocorrosion in circulation cooling system [11][12][13][14][15]: 1) Slime-forming bacteria are the first to settle on the prototype surface and form its protective polysaccharose membrane 2) A formed base creates favourable conditions for sedimentation and subsequent development of a variety of bacteria and microalgae and absorbs mechanical impurities. Organisms that develop there are aerobic ones and virtually prevent oxidation on the contaminated surface areas.…”

Section: The Results Of M Laboratory Experiments M [6] Onmentioning

confidence: 99%

Specific Features of Biocorrosion of the Circulation Cooling System in the Petrochemical Industry

Лаптев¹,

Poltarukha

Tourova

et al. 2021

E3S Web of Conf.

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The circulating water of the cooling systems of petrochemical enterprises has a number of special features: the temperature of cooling water is in the range of 14-28 °С all year round, the evaporation of water in cooling towers increases the concentration of dissolved salts. Inevitable ingress of hydrocarbons, dosing of corrosion inhibitors, scaling, reagents for dispersing and softening of the water creates favorable conditions for micro- and macroorganisms development. Existing standards stipulate that the number of viable bacterial cells in planktonic form should not exceed 10 cells/ml, the number of bacteria in the adhered form is not regulated, nevertheless these organisms in particular lead to biocorrosion. During the assessing of the biological degradation of water cycle equipment materials, it was studied the micro- and macroorganisms that populate the surface of steel samples 20. Studies of the effect of this bacteria on the corrosion of steel 20 showed that this whole complex of micro- and macroorganisms, releasing metabolites into the water, also indirectly affects the processes of corrosion, and when choosing protection methods, it is necessary to take into account not only the presence and types of bacteria, but also the entire local biocenosis.

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Section: The Results Of M Laboratory Experiments M [6] Onmentioning

confidence: 99%

Specific Features of Biocorrosion of the Circulation Cooling System in the Petrochemical Industry

Лаптев¹,

Poltarukha

Tourova

et al. 2021

E3S Web of Conf.

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“…Nevertheless, a large number of studies are currently being conducted in the field of biodegradation. Given the huge metabolic potential of microorganisms, it is expected that the development of cost-effective and viable biodegradation processes is only a matter of time [16].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Biofouling and Its Effect on the Properties of Basalt Fiber Reinforced Plastic Rebars Exposed to Extremely Cold Climate Conditions

et al. 2022

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For the first time, the possibility of penetration of mold fungi mycelium and spore-forming bacteria into the structure of basalt fiber reinforced plastic rebars has been shown in laboratory and field experiments. Biological contamination at the “fiber-binding” border reveals areas of swelling and penetration of mold fungi mycelium and bacterial spore cells into the binder component. After the exposure of samples at extremely low temperatures, strains of mold fungi of the genus Aspergillus were also isolated from the surface of the rebars. Additionally, spore-forming bacteria of the genus Bacillus immobilized for samples from two years ago. This indicates the high viability of immobilized strains in cold climates. Aboriginal microflora isolated by the enrichment culture technique from the samples was represented by: actinobacteria of the genera Nocardia and Streptomyces; yeast of the genus Rhodotorula; and mold fungi of the genus Penicillium. It was shown that the enrichment culture technique is a highly informative method of diagnosing the bio-infection of polymer composite materials during their operation in extremely low temperatures. The metabolic activity of the cells of cryophilic microorganisms isolated from experimental samples of basalt fiber reinforced plastic rebars was associated with the features of the enzymes and fatty acid composition of the lipid bilayer of cell membranes. In the case of temperature conditions when conventional (mesophilic) microorganisms stop developing vegetative cells, the process of transition of the lipid bilayer of cell membranes into a gel-like state was activated. This transition of the lipid bilayer to a gel-like state allowed the prevention of crystallization and death of the microbial cell when the ambient temperature dropped to negative values and as a result, after thawing, growth resumed and the metabolic activity of the microorganisms was restored. Studies have been carried out on the effect of biodepletion on the elastic strength characteristics, porosity and monolithicity of these materials, while at the same time, after a two year exposure, the strength preservation coefficient was k = 0.82 and the porosity increased by more than two times. The results show that the selected strains affect the properties of polymeric materials in cold climates in relation to the organic components in the structure of polymer composites.

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“…Среди перспективных материалов особое место занимают полимеры, обладающие такими качествами, как низкая плотность, высокая гибкость, химическая стойкость и высокие диэлектрические характеристики. Однако в результате влияния негативных факторов окружающей среды (высокая влажность, УФ-излучение) диэлектрические, механические и оптические свойства полимерных материалов подвергаются существенной деградации, что сказывается на работе оптоэлектронного изделия [4,5].…”

Section: Introductionunclassified

“…Among the promising materials, a special place is occupied by polymers having such qualities as low density, high flexibility, chemical resistance and high dielectric characteristics. However, as a result of the influence of negative environmental factors (high humidity, UV radiation), the dielectric, mechanical and optical proper ties of poly mer ic mater ia l s u ndergo significant degradation, which affects operation of an optoelectronic product [4,5].…”

Section: Introductionmentioning

confidence: 99%

Исследование Спектров Поглощения Фторуглеродных Покрытий, Полученных При Помощи Нч-Плазмотрона Атмосферного Давления

Шведов¹,

Елинсон²,

Кузькин³

et al. 2020

NanoRus

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В работе представлены результаты исследования спектров поглощения фторуглеродных покрытий, полученных при помощи низкочастотного плазмотрона низкотемпературной плазмы атмосферного давления. Рассмотрены амплитуды пиков поглощения и установлен химический состав покрытий. Определена ширина запрещенной зоны по методу Тауца.

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TO THE QUESTION OF BIODEGRADATION OF POLYMERIC MATERIALS IN NATURAL ENVIRONMENTS (review)

Cited by 5 publications

References 0 publications

Specific Features of Biocorrosion of the Circulation Cooling System in the Petrochemical Industry

Specific Features of Biocorrosion of the Circulation Cooling System in the Petrochemical Industry

Investigation of Biofouling and Its Effect on the Properties of Basalt Fiber Reinforced Plastic Rebars Exposed to Extremely Cold Climate Conditions

Исследование Спектров Поглощения Фторуглеродных Покрытий, Полученных При Помощи Нч-Плазмотрона Атмосферного Давления

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