Perfluoro-1,3-dioxolane and perfluoro-oxetane: promising gases for electrical insulation

Hoesl, Andreas; Pachin, Juriy; Chachereau, Alise; Kornath, Andreas and Franck, Christian M. (2019): Perfluoro-1,3-dioxolane and perfluoro-oxetane: promising gases for electrical insulation. In: Journal of Physics D-Applied Physics, Vol. 52, No. 5, 055203

Abstract

Perfluorinated cyclic ethers represent an interesting class of molecules to use as dielectric gases for electrical insulation. Measurements of the two compounds 4,4,5,5-tetrachloro2,2-difluoro-1,3-dioxolane (c-C3Cl4F2O2, CAS 87075-01-2) and octafluoro-1,4-dioxane (c-C4F8O2, CAS 32981-22-9) in a pulsed Townsend experiment are presented, their ionization and attachment rate coefficients are obtained and their electron attachment cross sections are estimated. Both gases have a high critical electric field strength of about 3.5 and 1.3 times the one of SF6, respectively, which is presumably due to very high electron attachment cross sections in the range from 2-4 eV. In particular, for c-C3Cl4F2O2 the values appear to be very close to the S-wave scattering limit around 3 eV. Based on these results, we recommend the two analogous compounds perfluoro-1,3-dioxolane (c-C3F6O2, CAS 21297-65-4) and pertluoro-oxetane (c-C3F6O, CAS 425-82-1) for further research for the use as insulation and refrigerant gases, since they are chemically comparable, presumably environmentally friendly, and have high vapor pressures.

• Item Type: Journal article
• Faculties: Chemistry and Pharmacy > Department of Chemistry
• Subjects: 500 Science > 540 Chemistry
• ISSN: 0022-3727
• Language: English