Abstract
A hard elastic film of poly(4-methyl-1-pentene) was investigated by using wide-angle X-ray diffraction, small-angle X-ray scattering (SAXS), and stress–strain measurements. The film showed somewhat hard elasticity above the glass transition temperature (Tg), while it showed a brittle nature below Tg. In the former case, the SAXS pattern of the stretched film was very analogous to that of usual crazed materials (crazelike feature), namely void scattering on the meridian and interference scattering due to microfibrils on the equator. The fibrillation was discussed in terms of deformability of the lamellae and, further, that of the hellcal chain. Our results were also compared with the model of Ĉaĉković and Hosemann for deformation of hard elastic crystalline materials.
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