Abstract
The tensile deformation behavior of poly (butylene terephthalate) (PBT) was characterized at various temperatures. Three distinct regions associated with the mechanical response at various temperatures were identified for PBT and the temperature related structure evolution with deformation was investigated by in situ synchrotron wide-angle X-ray scattering (WAXS) and small-angle X-ray scattering (SAXS) at 30 °C, 70 °C, 120 °C. Lamella thickening occurs at 120 °C due to the stress-induced melting and reorganization process. The α-β transition was observed during deformation for PBT samples stretched at 30 °C, 70 °C, 120 °C. A structure model was proposed to describe the deformation process of PBT at 30 °C, 70 °C, 120 °C.
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