Linear elastico-viscous properties of molten standard polystyrenes

Abstract

For the investigated standard polystyrenes possessing narrow molecular mass distributions the choice of an analytical distribution function does not pose serious problems, so that the two-parameter Wesslau function can be chosen for ease in handling. The best values for these parameters as well as for two short range molecular parameters are obtained with the aid of a regression method in which traditional data for the molar mass distribution are improved with the aid of elastico viscous data of high accuracy.