Abstract
The influence of additives (5–10% of oligoester acrylates, benzophenone, azobenzene, stilbene, and also 0·3% of water) on the effective viscosity η eff of polycarbonate melts has been investigated over the temperature range 220–240°. It was found that all the additives reduce η eff and lead to a complex type of temperature-time relationship. It is shown that reductions in η eff and the kinetic character of the latter are unrelated to chemical processes taking place in the melts, but are due to the modifying actionof the additives. Spectroturbidimetric analysis of solutions containing oligoester acrylates proves the heterogeneity of the modified materials, and average sizes of modifier particles in the polycarbonate have been determined.
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