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Structure and properties of polyethyleneterephthalate crystallized by annealing in the highly oriented state

Part 1 Morphological structure as revealed by small-angle X-ray scattering

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Abstract

The structure of polyethyleneterephthalate bristles drawn about five times in the amorphous state and subsequently crystallized at temperatures between 100 and 260‡ C has been studied by means of small-angle X-ray scattering. In addition density, heat of fusion and wide-angle scattering behaviour were measured. For comparison, similar experiments were carried out with undrawn samples. The results showed that the degree of crystallinity of PET cannot be calculated from density data on the basis of a simple two-phase model, since the effective densitiesρ *c andρ *a of the crystalline and amorphous regions depend strongly on crystallization and drawing conditions. With rising crystallization temperature the size of the mosaic blocks building up the crystalline layers and their longitudinal mutual order increase whereas the volume fraction of the crystalline region is only rather slightly effected by the annealing temperature. The difference between the effective densityρ *c and the “X-ray density”ρ c of the crystalline layers is supposed to be caused by lattice vacancies in the boundaries of the mosaic blocks.

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Author notes

  1. S. Fakirov

    Present address: Faculty of Chemistry, University of Sofia, Sofia-26, Bulgaria

Authors and Affiliations

  1. Institut für Physikalische Chemie der UniversitÄt Mainz, 65 Mainz, Germany

    E. W. Fischer & S. Fakirov

  2. “Sonderforschungsbereich 41”, Mainz, Darmstadt, Germany

    E. W. Fischer & S. Fakirov

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  1. E. W. Fischer
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  2. S. Fakirov
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Fischer, E.W., Fakirov, S. Structure and properties of polyethyleneterephthalate crystallized by annealing in the highly oriented state. J Mater Sci 11, 1041–1065 (1976). https://doi.org/10.1007/BF02396639

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  • DOI: https://doi.org/10.1007/BF02396639

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