We present initial results of the combined effects of elongational flow and elevated temperatures upon degradation of monodisperse atactic polystyrene solutions. An opposed jets apparatus is used, both to produce mechanical scission and to monitor the molecular weight distribution of the scission products. Between 25°C and 150°C degradation occurs as closely central scission of the molecules beyond a critical strain rate (Ef). Ef is found to be a decreasing function of temperature. At 150°C we present results for thermal degradation alone. All of these results correlate well with predictions based upon a thermally activated barrier to scission model.
|Original language||English (US)|
|Number of pages||4|
|Journal||Polymer communications Guildford|
|State||Published - Jan 1 1990|
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