Abstract
Morphological changes occurring during uniaxial drawing and subsequent annealing of amorphous poly(ethylene terephthalate) films have been studied. In the course of the drawing the polymer molecules or their aggregates were separated in the direction normal to the drawing direction. The original supermolecular structures of crystallite dimensions remained in the state of hexagonal packing. After annealing, the optical contrast of the multilayers in the film plane became more sharp, which may be attributed to a dominating crystallization into the form of lamellae. At the same time a separation of the polymer molecules composing the lamellae was observed in the planes perpendicular to the film plane. The absolute magnitudes of the long spacing determined by microscopy and by X-ray scattering showed a reasonable agreement.
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Bezruk, L., Kawai, T. & Lipatov, Y. Morphological Changes during Uniaxial Drawing and Annealing of Poly(ethylene terephthalate) Films. Polym J 6, 376–384 (1974). https://doi.org/10.1295/polymj.6.376
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DOI: https://doi.org/10.1295/polymj.6.376
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