Poly(butylene terephthalate) strips, undrawn and drawn to λ = 4.5, were annealed at different temperatures and times. WAXS and density measurements show a relatively high degree of crystallinity in the starting material, which increase linearly with the rise of the annealing temperature and time. Thermomechanical measurements and IR spectroscopy suggest that crystallization of poly(butylene terephalate) occurs with chain folding.
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Evstatiev et al. (1988) studied this question.
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