SEM studies of cold‐rolled spherulitic films of poly(tetramethylene terephthalate)

摘要

AbstractBy using the method of scanning electron microscopy, a visual study was made of the macro‐deformation of spherulitic deformation during the cold rolling of poly(ethylene terephthalate) (PET) and poly(tetramethylene terephthalate) (PTMT). By rolling solution cast films to different extension ratios, it was found that the surface material (nearest the rollers) appeared to deform first by the shearing action. With higher extension, the material toward the core of the film began to deform. In all cases, the deformation process tended to flatten the spherulites yet, in general, the spherulitic boundaries were maintained. It was noted that the same general behavior was observed for both PET and PTM