In the free-radical polymn. of styrene, a pulsed- or batch-type of polymn. process gave a higher space-time yield and efficiency than a stationary process at the same product mol. wt. and polydispersity. In the batch process, the range of av. mol. wt., conversion, and polydispersity fell between the values for a stationary process at the same concn. and one at a doubled concn. [on SciFinder (R)]