Temperature dependence of tensile behavior in poly(butylene terephthalate) with different crystallinity

Publication date: 5 September 2017
Source:Materials & Design, Volume 129
Author(s): Wenyang Zhang, Jingqing Li, Yingrui Shang, Hongfei Li, Shichun Jiang, Lijia An
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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