Structural properties of isotactic polypropylene film during stretching were investigated mainly by the measurements of proton spin‐lattice, T1 and spin‐spin, T2, relaxation times. Both T1 and T2a, T2 of the most mobile amorphous regions, of the sample stretched at 150°C are longer than those of the sample stretched at 130°C. These results indicate that in the sample stretched at 150°C the proportion of mobile amorphous region decreases, while the amorphous region achieves enhanced molecular mobility.
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