Absorption spectra of irradiated films of polyvinyl chloride coated with perylene.
The visible and UV spectra γ-irradiated films of polyvinyl chloride doped or coated with perylene were recorded. These films were irradiated either under a vacuum, in N2 O or in NH3. In the case of...
Chemical dosimetry with doped poly(halostyrene) film.
have been shown to be effective chemical dosimeters for dose rates to 1014 rads/sec and cover the range in dose from 5 X 104 to 1.5 X 107 rads. These materials form a stable distribution image of the radiation traversing the film and are particularly useful in connection with experiments using pulsed electron beam machines. From studies on the rate of appearance of color following exposure and on the molecular emission from solutions of leuco malachite greens, a metastable intermediate is found in the radiation and photochemical dissociation reaction. The radiation chemical sequence of events is summarized, and the leuco malachite greens are shown to be efficient energy scavengers in poly(halostyrene) hosts.
Electron spin resonance studies of polyvinyl chloride irradiated in NH3 gas
The electron spin resonance of polyvinyl chloride (PVC) irradiated in NH/ sub 3/ was studied. The radicals produced on irradiation in NH/sub 3/ do not differ greatly from those obtained on irradiation in vacuum, but the reactivity of the former to SO/sub 2/ to forrn RSO/sub 2/ radicals is far higher than that of those obtained in vacuum. The radicals produced by irradiation at-78 deg C and in vacuum was also studied. The spectra ofthese radicals were different from those of the racdicals produced at 20 deg C and in vacuum. The reactivity of the radicals produced in PVC is interpreted on the basis of the length of double bonds eonjugating with thc radical pi electron. (auth)