Layer structure formation in oriented poly(ethylene terephthalate) relating to micromechanical properties

Glassy poly(ethylene terephthalate), uniaxially drawn at 25 °C (cold drawing) and at 90 °C (hot drawing), was crystallized in a taut state without shrinkage at 100 °C, 150 °C, 200 °C and 250 °C. The nanostructure and the mechanical properties were surveyed by X-ray diffraction and microhardness. Sma...

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Bibliographic Details
Published in:Polymer (Guilford) 2007-01, Vol.48 (2), p.542-555
Main Authors: Uchiyama, T., Suyama, M., Alam, M.M., Asano, T., Henning, S., Flores, A., Baltá Calleja, F.J., Mina, M.F.
Format: Article
Language:English
Subjects:
Applied sciences
Crystallization
Exact sciences and technology
Microhardness
Organic polymers
Physicochemistry of polymers
Poly(ethylene terephthalate)
Properties and characterization
X-ray diffraction
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Summary:Glassy poly(ethylene terephthalate), uniaxially drawn at 25 °C (cold drawing) and at 90 °C (hot drawing), was crystallized in a taut state without shrinkage at 100 °C, 150 °C, 200 °C and 250 °C. The nanostructure and the mechanical properties were surveyed by X-ray diffraction and microhardness. Small-angle X-ray diffraction diagrams reveal typical 4-point patterns characteristic of the cold-drawn samples, whereas 2-point patterns are observed for the hot-drawn ones. Comparison of the molecular and the nanolayer inclinations in both drawings suggests that a mutual supplementary relationship holds between the c-axis tilting and the lamellar inclination. The layer structure formation is discussed in the light of these results. In addition, a correlation between the nanostructure formation and the micromechanical properties is offered, highlighting the differences found between the hot- and the cold-drawn materials.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2006.11.030