Stress-optical properties of amorphous polyethylene terephthalate fibres

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Abstract
At temperatures above the glass transition, amorphous polyethylene terephthalate fibres have been shown to possess optical and mechanical properties identical with those for a rubber. Thus, both the stress and the optical anisotropy may be directly related to strain (conveniently determined by the degree of retraction or shrinkage of pre-oriented fibres). The theoretical treatment of Kuhn and Grün has been employed to calculate the polarizability of the random link and the number of effective cross-links per molecular chain. Additionally, measurements have been made of the decay of stress and optical anisotropy (birefringence) in water at various temperatures and as expected for a rubber-like network both decay at identical rates. Moreover, the decay curves for different temperatures can be superimposed by a simple frequency shift. The shift factors as a function of temperature fit the Williams-Landel-Ferry equation.

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