Abstract
The planar extensional viscosity of foaming‐grade polystyrene, with and without blowing agent, was determined using a die consisting of a high‐aspect‐ratio straight rectangular channel followed by a hyperbolic convergent rectangular channel. With the hyperbolic geometry, the fluid near the centerline of the convergent channel was subjected to a constant rate of extension. The shear viscosity was found from the pressure drop along the straight channel, and the planar extensional viscosity was determined from the total pressure drop in the convergent channel minus the calculated pressure drop due to shearing. Two materials, polystyrene and a solution of 5% supercritical carbon dioxide in polystyrene, were tested using a tandem extrusion system and a high‐resolution gas pump. Values of the planar Trouton ratio are presented.
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