Abstract
An investigation has been made of effects on polystyrene films of exposure to electrical discharges in air, oxygen and nitrogen. By i.r. spectroscopy, many oxygen-containing groups and compounds (C=O, COC, etc.) were found in polystyrene film after exposure to electrical discharges in air. End-groups were also found to increase in number. Measurements of molecular weight revealed that crosslinking occurred simultaneously with degradation. These processes were accelerated by oxygen. A study has been made of a gel-fraction resulting from crosslinking; the variation of gel-fraction with time was followed. The gel-fraction was found to consist mainly of polystyrene molecules linked by etheric or keto-etheric bridges; it has practically the same composition as the gel-fraction obtained when polysytrene is kept in pure ozone.
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