AbstractThis study describes the recovery behavior from tensile strains of up to 0.15, of oriented poly(ethylene terephthalate) (PET) fibers, which were heat‐set at different temperatures while free to relax and when held taut at constant length at room temperature. The taut annealed samples showed superior recovery behavior over the strain range studied. From structural studies on these samples, and also from FTIR studies of structural changes during deformation on similar shapes, it is concluded that, while the recovery behavior in the free‐annealed samples is dominated by the amporphous phase, both the crystalline and the amorphous phases influence the recovery behavior of the taut‐annealed sa
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