Abstract
An apparatus for extension of polymers in the fluid and high-elastic states under constant true stresses is described. Determinations are made of the total, high-elastic and flow deformations and their rates in the course of extension of polystyrene having a viscosity-average molecular weight of 3 X 105 at 130 °C under various constant true stresses. The stress relaxation and elastic recoil after the cessation of extension are investigated at various values of deformation. Refore the steadystate flow is attained the viscosity and relaxation characteristics of polystyrene passes through a maximum. As was to be expected, the values of longitudinal viscosity under steady flow conditions correspond to the viscosity values determined during the extension at a constant deformation rate.
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