“…All of the other conditions gave rise to an amorphous halo, although in some cases, the intensity profile seemed to concentrate at the equator region; this suggested the existence of some polymer chain orientation in the stretching direction and the presence of some content of mesophase, as reported elsewhere. 39,43,45,47,49 Although we expected to have amorphous halos in the C1, C2, C3, and C4 conditions, because the material was stretched to only 1.6Â, C6 and C8 were stretched to a much higher stretching level (2.1Â) and still presented amorphous halos. This result showed that the temperature had an important role in the structural development of the sample, and in these cases, it hindered the strain-induced crystallization mechanism of PET because of a possible competing mechanism between chain elongation due to mechanical deformation and chain relaxation due to the elevated temperature.…”