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Issue 43, 2015
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Melt recrystallization behavior of carbon-coated melt-drawn oriented isotactic polypropylene thin films

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Abstract

The melt recrystallization of vacuum carbon evaporated melt-drawn iPP thin films at varying melting temperature, melting time and recrystallization temperature was studied by means of transmission electron microscopy combined with electron diffraction. It was found that the carbon-coated melt-drawn highly oriented iPP thin films melt-recrystallized always in an oriented way with well ordered crystalline lamellae perpendicular to the drawing direction during sample preparation. This is related to the strong fixing effect of the vacuum evaporated carbon film on the oriented iPP chain stems on the surface layer. Since these fixed iPP chain stems are originally included in the α-iPP crystal lattice, they serve as α-iPP nuclei during the recrystallization process and induce highly oriented iPP lamellae composed of only α-iPP crystals. This indicates that the frequently reported orientation-induced β-iPP crystallization is a nucleation controlled process. Moreover, by comparing the original oriented structure of melt-drawn iPP films with the recrystallized ones, it is concluded that the characteristic wide angle lamellar branching is severely suppressed in elongation-induced crystallization, while takes place evidently during melt-recrystallization.

Graphical abstract: Melt recrystallization behavior of carbon-coated melt-drawn oriented isotactic polypropylene thin films

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Publication details

The article was received on 12 Jul 2015, accepted on 08 Sep 2015 and first published on 10 Sep 2015


Article type: Paper
DOI: 10.1039/C5PY01083G
Author version available: Download Author version (PDF)
Citation: Polym. Chem., 2015,6, 7524-7532
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    Melt recrystallization behavior of carbon-coated melt-drawn oriented isotactic polypropylene thin films

    L. Ma, J. Zhang, M. A. Memon, X. Sun, H. Li and S. Yan, Polym. Chem., 2015, 6, 7524
    DOI: 10.1039/C5PY01083G

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