Abstract
AbstractA method is given for calculating the molecular weight distributions of ultrasonically degraded polystyrene. This method is based on the assumption that the bond which is most likely to break is situated in a plane passing through the center of the polymer molecule and which is normal to the propagation direction of the shock wave from a collapsed cavity. The theoretical distribution has been calculated for a polystyrene fraction of average molecular weight of 4.8 × 105 dissolved in benzene after 2 hr. irradiation. The undegraded fraction is assumed to possess a rectangular differential number distribution. The theoretical distribution is peakier than that found experimentally by turbidimetric titration. The difference may be due to the lack of resolving power shown by turbidimetric titration.
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