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A new finding is reported concerning some structural change in the amorphous state of the polymer which occurs during the so-called induction period before the start of crystallization. Annealing of poly (ethylene terephthalate) (PET) at 115°C, or 40°C above the glass transition temperature, Tg, has been investigated by small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS) techniques. At a very early stage of the induction period the SAXS intensity starts to increase in the range of Q = 0.02-0.04 ,~- 1, where Q is the length of the scattering vector (Q = 4~ sin 0/2), and continues to increase until the beginning of crystallization. Corresponding to the initation of crystallization, another strong peak, caused by the usual long-period structure, appears in the vicinity of Q = 0.05 A- 1. It is confirmed from the WAXS measurements that no local ordering takes place during the induction period. To clarify the crystallization process, distance distribution analysis is also carried out

Посилання на статтю:

Structural formation of poly(ethylene terephthalate) during the induction period of crystallization: 1. Ordered structure appearing before crystal nucleation / M. Imai, K. Mori and T. Mizukami // Polymer. – 1992. – Vol 33. – P. 4451-4456.

Structural formation of poly(ethylene terephthalate) during the induction period of crystallization: 1. Ordered structure appearing before crystal nucleation - Завантажити.