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Elongational flow-induced crystallization in supercooled liquid poly(ethylene terephthalate) (PET) was investigated via elongational flow opto-rheometry (e.f.o.r.) and temperature-modulated differential scanning calorimetry (t.m.d.s.c.) in the temperature range 100-130°C, in which the blow moulding operation on PET is usually conducted. Measurements of tensile stress σ(t) and birefringence Δn(t)...
Rayleigh scattering studies were conducted in order to examine the elongational flow-induced crystallization behaviour of poly(ethylene terephthalate) (PET) in the supercooled liquid state (100–130°C). In the specimen elongated at 110°C where spherulite growth was negligible, initially nothing happened, but flow-induced crystallization then occurred rather suddenly at a critical tensile strain of...
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