Changes in the Electrical Characteristics of Compounds upon Holding in Water and Water–Salt Solutions
Experimental data are presented concerning the changes in the characteristics of different polymeric electrical insulating compounds after a rather long holding in water and salt solutions at room temperature and 80°C. It has been found that the water absorption level of thermosetting compounds, as...
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Published in | Russian electrical engineering Vol. 91; no. 5; pp. 348 - 353 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Moscow
Pleiades Publishing
01.05.2020
Springer Nature B.V |
Subjects | |
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Abstract | Experimental data are presented concerning the changes in the characteristics of different polymeric electrical insulating compounds after a rather long holding in water and salt solutions at room temperature and 80°C. It has been found that the water absorption level of thermosetting compounds, as well as the worsening of their electrical properties, such as specific bulk electrical resistance and dielectric loss tangent dielectric permittivity under the action of water–salt media, is determined by the chemical nature of these polymers. The prolonged holding of epoxy compounds in salt solution at a normal and at an elevated temperature leads to water absorption lower than 1% and does not exert any significant effect on the electrical characteristics thereof. The holding of polyurethane compounds in a salt solution leads to a more than a twofold increase in water absorption compared to the epoxy compounds and to such a dramatic change in their electrical characteristics that it makes it impossible to use some of these compounds as insulating materials for manufacturing products that are to be exposed to water and water–salt solutions. The low water resistance inherent in polyurethane compounds and other nitrogen-containing polymers can be caused by a low hydrolytic resistance of the C–N bond occurring in the structure thereof. It is shown that water transpenetration through the layer of the SPB-KhP-80 polyurethane elastomer is quite possible. |
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AbstractList | Experimental data are presented concerning the changes in the characteristics of different polymeric electrical insulating compounds after a rather long holding in water and salt solutions at room temperature and 80°C. It has been found that the water absorption level of thermosetting compounds, as well as the worsening of their electrical properties, such as specific bulk electrical resistance and dielectric loss tangent dielectric permittivity under the action of water–salt media, is determined by the chemical nature of these polymers. The prolonged holding of epoxy compounds in salt solution at a normal and at an elevated temperature leads to water absorption lower than 1% and does not exert any significant effect on the electrical characteristics thereof. The holding of polyurethane compounds in a salt solution leads to a more than a twofold increase in water absorption compared to the epoxy compounds and to such a dramatic change in their electrical characteristics that it makes it impossible to use some of these compounds as insulating materials for manufacturing products that are to be exposed to water and water–salt solutions. The low water resistance inherent in polyurethane compounds and other nitrogen-containing polymers can be caused by a low hydrolytic resistance of the C–N bond occurring in the structure thereof. It is shown that water transpenetration through the layer of the SPB-KhP-80 polyurethane elastomer is quite possible. |
Author | Zhun, V. I. Patsino, A. V. Maslov, V. A. Panin, A. L. Polyudchenkov, A. V. Antonov, V. N. Panov, A. A. |
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Keywords | hydrolytic resistance polyepoxides electrical properties water absorption water–salt medium compound polyurethanes |
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References | Ulegin, S.V., Kadykova, Yu.A., and Artemova, A.V., Epoxy compounds dilled with dispersed mineral filler, Molodoi Uch., 2015, no. 24 (104). Zuev, Yu.S., Razrushenie polimerov pod deistviem agressivnykh sred (Destruction of Polymers in Aggressive Media), Moscow: Khimiya, 1972. Reitlinger, S.A., Pronitsaemost’ polimernykh materialov (Permeability of Polymeric Materials), Moscow: Khimiya, 1974. SchweitzerP.A.Mechanical and Corrosion-Resistant Properties of Plastics and Elastomers2000Boca Raton, FLCRC Press10.1201/9781482270280 Vakulenko, D.A. and Turusov, R.A., Water proof of polymer compounds, Inzh.-Stroit. Zh., 2017, no. 7 (75). WrightP.CummingA.P.C.Solid Polyurethane Elastomers1969New YorkGordon and Breach Glinka, N.L., Obshchaya khimiya (General Chemistry), Moscow: Integral-Press, 2003. 1262_CR4 P. Wright (1262_CR5) 1969 1262_CR3 1262_CR2 P.A. Schweitzer (1262_CR1) 2000 1262_CR7 1262_CR6 |
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SubjectTerms | Corrosion resistance Dielectric loss Dielectric properties Elastomers Electrical properties Engineering Epoxy compounds High temperature Insulation Machines Manufacturing Nitrogen Polyurethane resins Processes Room temperature Saline solutions Water absorption Water resistance |
Title | Changes in the Electrical Characteristics of Compounds upon Holding in Water and Water–Salt Solutions |
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