Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School



In this study, an attempt was made to understand the type and amounts of metastable intermediates formed when perfluoropropane was placed under electrical stress by adding small amoutns of organic compounds such as thiophene, isopropyl mercaptan, ethyl methyl sulfide, dimethyl disulfide, carbon disulfide, and nitrobenzene. The sulfur compounds were chose because fluorine was reported to react with thiophene to form sulfur hexafluoride. It was thought that if fluorine were formed from perfluorocarbons in the corona, it might be advantageous to remove this metastable species. Nitrobenzene was used because of its known free radical inhibitor characteristic in polymerization reactions. The hope was that these additive compounds might be effective in reducing corona or inhibiting breakdown by removing metastable intermediates formed in the gas by the electrical stress. It was also hoped that the study of the decomposition products and the nature of effectiveness of the additives might provide an insight into the relationship of chemical structure and dielectric strength. Evidence was obtained that the stable decomposition products of perfluoropropane after exposure to electrical stress do not in themselves begin to tell the story of the chemical changes taking place during the exposure process.

Library of Congress Subject Headings

ionization of gases


Includes bibliographical references



Number of Pages



South Dakota State University