Summary
The extensional flow of molten polystyrene was studied in the strain rate range of 7.8×10−4 sec−1 to 2.2×10−2 sec−1 at a test temperature of 300‡F (149 ‡C) Extensional viscosity was compared to shear viscosity measured at the same degree of stress and temperature and found to be from 3 to 350 times greater in magnitude but much less stress dependent.
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Ballman, R.L. Extensional flow of polystyrene melt. Rheol Acta 4, 137–140 (1965). https://doi.org/10.1007/BF01984710
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DOI: https://doi.org/10.1007/BF01984710