A5010495656- High voltage insulation and dielectric phenomena
- Synthesis and properties of polymers
- Epoxy Resin Curing Processes
- Power Transformer Diagnostics and Insulation
- Advanced Sensor and Energy Harvesting Materials
- Dielectric materials and actuators
- Advanced Materials and Semiconductor Technologies
- Conducting polymers and applications
- Advanced Fiber Optic Sensors
- Polymer Nanocomposite Synthesis and Irradiation
- Organic Electronics and Photovoltaics
- Material Properties and Applications
- Additive Manufacturing and 3D Printing Technologies
- Lightning and Electromagnetic Phenomena
- Silicone and Siloxane Chemistry
- Sensor Technology and Measurement Systems
- Polymer Nanocomposites and Properties
- Surface Modification and Superhydrophobicity
- Ionic liquids properties and applications
- Polymer Science and Applications
- Electrochemical Analysis and Applications
- biodegradable polymer synthesis and properties
- Carbon Nanotubes in Composites
- Tribology and Wear Analysis
- Plasma Applications and Diagnostics
Peter the Great St. Petersburg Polytechnic University
2016-2025
St. Petersburg State Technological Institute
2002-2003
Physicotechnical Institute
1997
Russian Academy of Sciences
1997
Petersburg Nuclear Physics Institute
1974-1989
Polyimides (PIs) are materials that resistant to high temperatures and crucial for the manufacturing of films, fibers, coatings, 3D-printed items. PIs widely used as electrically insulating in electronics electrical engineering. This study investigated how chemical structure (i.e., choice initial monomers), synthesis conditions prepolymer amide solvent), forming polyimide films final curing temperature) affect thermophysical properties short-term strength obtained different structures. In...
This paper analyzes the methods of municipal waste management in Metropolitan areas people's Republic China, as well study used our country, which allowed on basis this work to assess quality Russian Federation and propose possible solutions problems found. To overcome associated with method management, we creation expansion domestic industrial base, providing industry for processing, disposal modern high-tech competitive, environmentally friendly equipment.
The charge relaxation processes in the films based on polyimide and polytetrafluoroethylene (the latter serves as a coating) have been studied. coating effect under high humidity conditions was revealed. obtained experimental data analyzed context of present-day knowledge mechanism. complex spectra thermally stimulated depolarization currents (TSDC) were resolved into individual components described by first-order kinetics equations using computer simulation. TSDC activation energies...
The aim of this work consists in pursuit electret structure with excess humidity and high thermostability. charge relaxation mechanism polyimide modified films is established. It shown that the layers polytetrafluoroethylene on surface lead to essential increasing state stability at elevated temperature humidity. currents thermally stimulated depolarization were analyzed basis developed physical model.
This work focuses on the effect of macromolecular rigidity absorption characteristics polyimide (PI) films. The currents were measured for 4 hours in a broad temperature range (from 25 to 175 °C). dependences and activation energies conductivity PI films with different achieved. experimental data analyzed determine Voigt equivalent circuits' parameters. Using these parameters, dielectric permittivity, loss factor coefficient calculated compared low frequency range.
Abstract In this article, we will familiarize with the currently used methods of assessing the6 maximum possible number victims, their analysis and construction algorithms, followed by a comparison results, on basis which most optimal method victims be chosen. An approach to based modeling territorial distribution people within zone damaging factors. One complex urgent tasks in framework application existing approaches assessment for insurance purposes is problem density zones affecting The...
Non-woven polypropylene(PP) is the nonpolar polymer that widely used in mechanical engineering, manufacture of composite materials and medical equipment. It's available it's relatively inexpensive. The article devoted to study mechanical, electrical electret properties non-woven "Spunbond" polypropylene CC20, CC35, CC40 CC50, CC60, CC70, CC80, CC90, CC100. Here CC means grams per square meter (g/m2). stability state was studied by method thermoactivation spectroscopy. dependences...
Abstract In this work, the surface of polyimide films PMDA-ODA was modified using a barrier discharge in order to optimize their biological properties when interacting with culture human dermal fibroblasts. The optimal modes processing gas discharge, which allows increase proliferative activity cells, are found.
Abstract Surface modification of films the laboratory R‐BAPB polyimide based on 1,3‐bis(3,3′,4,4′‐dicarboxyphenoxy)benzene (dianhydride R) and 4,4′‐bis(4‐aminophenoxy)biphenyl (diamine BAPB) was performed using a dielectric barrier discharge (DBD) with aim increasing proliferative activity human fibroblasts these films. The optimal duration DBD plasma treatment that provided highest fibroblast established. surface roughness value film treated for this period time equal to 47.5 ± 4.7 nm, its...
The article presents the results of pedagogical monitoring conducted at Peter Great St. Petersburg Polytechnic University. We considered problems associated with lack professional motivation first-year students in undergraduate system. authors a experiment on conjugation academic disciplines. Such as natural science and cycles. offered ways integration disciplines within preparation area "Technosphere safety".
This work focuses on electrical properties of a new biodegradable composite material with different mass percentages filler. The measurements dielectric permittivity, conductivity were made. Time dependences electretic potential differences achieved.
The absorption charging I <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ch</sup> and discharging xmlns:xlink="http://www.w3.org/1999/xlink">dis</sup> currents of the cable polyethylene insulation before after thermal aging were investigated experimentally. These data are analyzed on basis two physics models which correspond to Maxwell Voigt equivalent circuits. aim work is show that measurements characteristics nondestructive diagnostic method...
In this paper the dependences of self-discharge voltage and recovered on time are measured over a wide range electric field strengths temperatures. The values one most important technical characteristics capacitors, absorption coefficient, have been determined. analysis experimental data was carried out basis series-parallel equivalent Maxwell circuit, i.e. multilayer dielectric model. dependencies coefficient temperature strength were obtained. relaxation mechanisms charge at low...
This study focuses on charge relaxation process in a new composite material based polylactide (PLA) and montmorillonite (MMT), which was used as filler. The samples with different mass percentages of MMT were charged corona discharge studied using the compensation method vibrating electrode. Time dependences electret potential differences achieved. Thermally stimulated depolarization currents (TSDC) to identify processes. TSDC spectra analyzed terms superposition method.
This paper presents the results of studying electrical properties and stability electret state nonwovens made from «spunbond» polypropylene polyimide by electroforming. The in studied samples was created corona discharge. potential difference isothermal mode thermoactivation spectroscopy thermally stimulated conditions.
Polypropylenes (PP) and polyimides (PI) are non-polar polar polymers widely used in mechanical engineering, manufacturing of composite materials medical equipment. The article is focused on the study electrical electret properties non-wovens "Spunbond" polypropylenes (CC20 - CC100) non-woven polyimides. Charge accumulation kinetics charge relaxations were tested analyzed for these materials. stability state was studied by method thermoactivation spectroscopy. dependences compensating...