Abstract
The stress-strain birefringence relations obtained from the hot drawing of poly(ethylene terephthalate) films are analysed within the framework of non-Gaussian models of rubber elasticity. It is found that, in spite of the increasing influence of strain-induced crystallization for higher draw ratios, the proposed treatment of experimental results leads to the definition of the number of statistical links per elastic chain in the amorphous part of the sample for any state of elongation. The results suggest a progressive disentanglement of the physical network structure and make possible an evaluation of the limit of extensibility attainable in cold-drawing.
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