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Studies Of Radiation Effects In Three High Polymers, Heidi Rene-Mitchell Ries
Studies Of Radiation Effects In Three High Polymers, Heidi Rene-Mitchell Ries
Physics Theses & Dissertations
Three high polymers, Mylar®, Ultem®, and Kapton®, were irradiated to total doses of 1, 5, and 9.5 gigarad using 1-MeV electrons. The glass transition temperatures (Tg) of the materials before and after irradiation were measured using an AC electrical dissipation factor technique. From the Tg data, it was found that the electron radiation at these total doses results in net chain scissioning in Mylar and net crosslinking in Ultem, while self-mending is predominant in Kapton. The dielectric constant was measured before and after irradiation, but no significant changes due to irradiation were observed. Electron paramagnetic resonance (EPR) …