Surface and bulk morphology of cold-crystallized poly(ethylene terephthalate) |
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Authors: | Qamer Zia Elisabeth Ingoli? René Androsch |
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Institution: | (1) Center of Engineering Sciences, Martin-Luther-University Halle-Wittenberg, 06099 Halle/Saale, Germany;(2) Austrian Centre for Electron Microscopy and Nanoanalysis, 8010 Graz, Austria; |
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Abstract: | The morphology/habit of crystals of cold-crystallized poly(ethylene terephthalate) (PET) has been evaluated using scanning
and transmission electron microscopy and using atomic force microscopy. The combination of different preparation and analysis
techniques allowed assessing the structure at the nanometer scale of films of PET at both the surface and the bulk. It is
found that crystals formed on heating the amorphous glass to a temperature higher than the glass transition temperature are
of lamellar shape in the bulk and almost isometric habit at the surface. This finding is explained by different rates of nucleation/crystallization
in the bulk and at the surface, being supported by the observation of nanometer-scale surface heterogeneities after quenching
PET to ambient temperature before crystallization was initiated by heating. |
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