The ESR method has been used to investigate the structure and properties of highly drawn ultra-high molecular weight polyethylene fibres. The values of T50G, rotational correlation times and the free radical decay curves for fibres of various draw ratios have been obtained from ESR spectra. The model of soft domain formation in fibres at high draw ratios is used to explain the experimental results.
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Tiňo et al. (1996) studied this question.