26 Result(s)
within
V. A. Lysenko
Polymer Sciences
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Article
Study of Electrical and Mechanical Properties of Carbonized Polyoxadiazole-Based Fibers
The influence of temperature resistance of polyparaphenylene-1,3,4-oxadiazole fibers of Arselon and Arsenol-S brands on the specific electrical conductivity, strength, rigidity modulus, and breaking elongation...
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Article
Effect of Heat Treatment on Mechanical Properties of Polyoxadiazole Yarns
The present article is dedicated to a study of the effect of heat treatment on the mechanical properties of Arselon and Arselon-C yarns in the temperature range 250-475°C. The safe operating temperature range ...
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Article
Development and Investigation of Thermocouples Based on Carbon Fibers
The thermoelectric sensitivity of thermocouples based on carbon fibers (CF) from polyoxadiazole (POD), hydrated cellulose (HC), and polyacrylonitrile (PAN) is studied. Methods are proposed for making thermocou...
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Article
Electric Resistance of Carbon Polyvinyl Alcohol Fibers
The main patterns of the influence of the modes of dehydration and carbonization on the electrical resistance of carbon fibers based on polyvinyl alcohol have been determined. For the produced carbon fibers, t...
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Article
Influence of Heat Treatment on Mechanical Properties of Polyoxadiazole Yarns and the Relationship of These Properties to Electrical Conductivity in the Carbonized State
The effect of heat treatment of Arselon and Arselon-C polymer yarns in the range 325-400°C on their strength, rigidity modulus, and electrical conductivity followed by carbonization up to 900°C was studied. Th...
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Article
Effect of Heat Treatment on Semiconducting Properties of Polyoxadiazole Carbon Fibers
The effect of heat-treatment regimes of poly(p-phenylene-1,3,4-oxadiazole) polymer threads on the electrical conductivity of carbon fibers based on them is studied. The electrical conductivity is shown to depend ...
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Article
Electrical Resistance of Carbonized Polyvinyl Alcohol Fibers
A study was carried out on the effect of the carbonization temperature of dehydrated polyvinyl alcohol fibers on their electrical resistance at room temperature. A relationship was found between the electrical...
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Article
Electrothermal Transformations of Polyoxadiazole Fibers during Carbonization
The effects of heating and carbonization regimes on the properties of poly(p-phenylene-1,3,4- oxadiazole) fibers and carbon fibers made from them were studied using x-ray, thermal, electrothermal, and mass-spe...
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Article
Electrothermal Properties of a Polyoxadiazole Fiber System
Model concepts are developed of polymer and carbon fibers as systems and microcomposites, and of system transitions during heat treatment and carbonization. The patterns of influence of heat treatment regimes ...
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Article
Modeling Systemic Tranformations in Carbon-Fiber Production Technology
The basic principles of information modeling are examined as systems engineering technology for producing carbon fibers (CFs) with given properties. The concept of a fiber system is introduced based on general...
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Article
Systemic Transformations During Heating and Carbonization of Polyoxadiazole Fibers
The effect of thermal degradation, including at low temperatures (50-350°C), of poly-p-phenylene-1,3,4-oxadiazole fibers on their electrical conductivity during carbonization (900°C) was studied. The electrica...
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Article
The Influence of Thermal Processing on the Properties of Carbon Fibers Based on Polyoxadiazole
The influence of heat treatment on the properties of carbon fibers based on polyparaphenylene-1,3,4-oxadiazole was studied. Dependences of mass loss, shrinkage, linear density and electrical resistance of carb...
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Article
Information Modeling in Systems Design of Carbon—Carbon Electrically Conducting Porous Composites
An algorithm for designing fuel-cell gas-diffusion substrates (GDSs) based on systems design methods, was proposed. An information model of the process for fabricating carbon—carbon electrically, conducting po...
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Article
Carbon—carbon composites based on precursors obtained by electrostatic spinning
Technical specifics of the preparation and properties of carbon—carbon electrically conductive porous composites were studied. Non-cloth material of ultrafine polyacrylonitrile fibers was used as the filler. I...
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Article
Electrically conducting carbon composites: systems design and information modeling
General systems theory is used to break down electrically conducting carbon composites (ECCs) and gas-diffusion substrates (GDTs) in fuel cells as objects for systems design. An information model is proposed f...
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Article
Carbon-fluoropolymer composites: Increased electrical conductivity
The ability to increase the electrical conductivity of carbon-fluoropolymer composites by depositing a graphite layer on their surface was demonstrated. This made it possible to use them, in particular, as gas...
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Article
Resource-conserving carbon fibre technologies
Data are reported on the status and prospects for development of world production of carbon fibres. The basic research trends are distinguished in creation of resource-conserving technologies for production of...
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Article
Carbon nanotubules: morphology and properties
The morphology and sorption characteristics of carbon nanotubules of different types were investigated. Experiments were conducted on separating individual carbon nanotubules from agglomerates with mechanical,...
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Article
Comparative evaluation of technologies and characteristics of porous conducting composites used in hydrogen fuel cells
The existing technologies for industrially manufactured GDL and their decomposition to the level of the individual constituents were analyzed and systematized. The cost and output of products manufactured with...
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Article
Anisotropy of the conductivity of carbon fibre materials
The effect of the structure of graphitized fibre materials (fabric, nonwoven, tricot), degree of compression, and direction of current flow on their resistivity was investigated. It was shown that there are lo...
