Abstract
We have examined the influence of the strain-rate mode—constant extension rate (CER) and constant strain rate (CSR)—on crystallization kinetics during hot-drawing of poly(ethylene terephthalate) film. It was found that strain rate/draw time superposition, previously observed in CER drawing, is also applicable to CSR drawing, and that the temperature dependence of the shift factor is essentially the same in both modes of deformation. In CSR drawing, crystallization onset occurs at shorter times and the rate of crystallization is higher. Further analysis of the CSR data confirms previous CER data showing that at high strain rates the crystallization rate during drawing increases with temperature, and that this trend gradually reverses as strain rate decreases.
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