New polymer systems based on alicyclic polyimides

Zhubanov, B. A.; Кравцова, В. Д.; Mukhamedova, R. F.; Bekmagambetova, K. Kh.

doi:10.1134/s1070427206110255

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…The symmetrical arrangement of the polar carbonyl groups, as seen from the below-mentioned general formula of investigated FPI, provides low dielectric loss level typical for polyimides [16]. Depending on the chemical structure of the investigated fluorinated alicyclic polyimides value of dielectric loss is around (1-4)×10 -3 [13,14]. Increasing dielectric loss associated with the degradation products formation in the case of FPI-1 ones are registered at 380 °C and for FPI-2 and FPI-3 ones at temperature of 340 and 320 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Developed previously [12,13] fluorinated alicyclic polyimides and their compositions with some industrial polymer such as polypyromellitimide lacquer brand AD-9103 (Russia) are the study objects. The samples were prepared on glass substrate in the film form with thickness 40 ± 5 um, which was dried by heating under vacuum up to 300 °C.…”

Section: Methodsmentioning

confidence: 99%

“…High thermal stability, ability to maintain dielectric, physical and mechanical properties over a wide temperature range, low thermal expansion, accessibility and adaptability for production are their advantages. Furthermore, they form stable compounds with many different compositions [12,13], which allows to obtain new materials with desired parameters. Also dielectric loss tangent there is a very important factor determining the electric field behavior in the dielectric in addition to dielectric constant.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electrical Properties of Fluoro-Containing Alicyclic Polyimides

Кравцова¹,

Umerzakova²,

Iskakov³

et al. 2015

JCCE

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Abstract:The electrical, physical, mechanical and thermal properties of fluorine-containing alicyclic polyimides have been investigated. It was shown that the minimum value of the dielectric constant 1.91 at room temperature and 1 kHz frequency was achieved for polymers containing only one fluorine atom in the structure. The dielectric loss tangent of new polymers was (1-4)×10 -3 . Electro-physical parameters were stable during polymer heating up to 300 °C, and at the frequency from 1 to 20 kHz. Resistivity by heating in the air up to 320-380 °C has been investigated depending on the polyimides structure. The coefficient of moisture absorption for the fluorine-containing polyimide based on dianhydride with 4,4'-oxydianiline was determined at 50% humidity and 25 °C. It was around 0.6, but after immersion in the water for 24 and 48 h was 0.8% and 1.2%, respectively. Manufactured films had tensile strength to 160-170 MPa, and elongation up to 55%.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electrical Properties of Fluoro-Containing Alicyclic Polyimides

Кравцова¹,

Umerzakova²,

Iskakov³

et al. 2015

JCCE

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Optically transparent fluoro-containing polyimide films with low dielectric permeability

Кравцова¹,

Umersakova²,

Iskakov

et al. 2014

SPIE Proceedings

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Temperature State of the Electrical Insulation Layer of a Superconducting DC Cable with Double-Sided Cooling

2021

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For the reliable operation of a high-voltage DC cable with high-temperature superconducting current-carrying conductors with a sufficiently high difference in electrical potentials, it is necessary to maintain a fixed temperature state not only of the conductors but also of other cable elements, including the electrical insulation layer. In this layer, despite the high electrical resistivity of its material, which can be polymer dielectrics, Joule heat is released. The purpose of this study was to build a mathematical model that describes the temperature state of an electrical insulation layer made in the form of a long hollow circular cylinder, on the surfaces of which a constant potential difference of the electric field is set. Within the study, we consider an alternative design of a cable with central and external annular channels for cooling liquid nitrogen. Using a mathematical model, we obtained integral relations that connect the parameters of the temperature state of this layer, the conditions of heat transfer on its surfaces, and the temperature-dependent coefficient of thermal conductivity and electrical resistivity of an electrical insulating material with a given difference in electrical potentials. A quantitative analysis of integral relations is carried out as applied to the layer of electrical insulation of the superconducting cable. The results of the analysis make it possible to assess the possibilities of using specific electrical insulating materials in cooled high-voltage DC cables under design, including superconducting cables cooled with liquid nitrogen

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New polymer systems based on alicyclic polyimides

Cited by 3 publications

References 3 publications

Electrical Properties of Fluoro-Containing Alicyclic Polyimides

Electrical Properties of Fluoro-Containing Alicyclic Polyimides

Optically transparent fluoro-containing polyimide films with low dielectric permeability

Temperature State of the Electrical Insulation Layer of a Superconducting DC Cable with Double-Sided Cooling

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