Abstract
The tensile behavior of PBT with different crystallinity was investigated at various temperatures. It turned out that the origin of stress whitening is different for PBT crystallized at 100°C and 180°C. The deformation of PBT crystallized at 100°C involves crazing/tearing and fibrillation at different temperatures. The complicated fracture morphologies including brittle fracture, fibrillation and ductile ploughing are linked to the temperature-dependent deformation mode of PBT crystallized at 180°C. The yield behavior could be described based on the Ree-Eyring model for PBT crystallized at 100°C and 180°C. The effect of temperature on Young's modulus, fracture strain and yield stress was analyzed and the fracture morphology was discussed in detail.
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