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Abstract
The elastic properties of several polyurethane yarns and a natural-rubber filament have been measured. Part 1 of the paper deals with the behaviour of the materials in the condition in which they were supplied. In Part 2, the properties of the materials after thermal treatments at various temperatures within the range 20–220°C are presented and discussed.
Thermal treatment is shown to have a pronounced effect on the stress-strain behaviour of the synthetic yarns, measured relative to their set dimensions, and on the retractive stress at a given extension. The elastic recoveries of the yarns are improved, their breaking extensions increased, and their strengths slightly decreased after thermal treatment.
Relative to the synthetic yarns, thermal treatment has only a small effect on the elastic properties of rubber.