Abstract
Creep, recovery, and stress-relaxation experiments with simultaneous measurements of birefringence have been carried out on polystyrene films above their softening temperature. The ratio of birefringence to stress is a constant independent of the stress, elongation, temperature, and molecular weight of the polystyrene. The data indicate that polystyrene has a semipermanent network structure. The network is most likely caused by the strong intertwining of the polymer molecules.
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