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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
Thermodynamic Modeling of the Bi–Ga–Zn System
Experimental data are used to build a thermodynamic model for the liquid phase of the Bi–Ga–Zn system. The model and those of other phases are used to determine coordinates of the invariant points of the Bi–Ga...
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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
Thermodynamic Modeling of the Ag–Sb–Sn System
Thermodynamic models of phases in the Ag–Sb–Sn system are constructed on the basis of the available experimental information. Polythermal sections in the phase diagram of this system are calculated for composi...
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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
Issues of Back-Up and Control in an Ensemble of Atomic Clocks Based on Hydrogen Masers
Issues in the output signal generation of an atomic clock ensemble and the smooth management of the time scale are considered. Special algorithms are proposed to solve the objectives, making it possible to imp...
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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
Thermal Transformations of Polyoxadiazoles
Changes of the structural characteristics and electrical properties of fibers based on polyoxadiazole (Arselon) upon a low-temperature thermal treatment in an inert atmosphere were studied. Extremal dependence...
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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
Thermochemical structural transformations of polyoxadiazoles
Changes in the physical and chemical structure of polyoxadiazole upon high-temperature heat treatment of Arselon fiber in inert and oxidizing atmosphere were studied. The role of the morphological rearrangemen...
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Article
Effect of carbon nanostructures on the carbonization of polyacrylonitrile
Composite materials based on polyacrylonitrile with carbon nanofillers (technical-grade carbon, thermally expanded graphite, carbon nanotubes) were synthesized. A carbonization of film and fiber composite samp...
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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...
