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The crystallization of poly(ethylene terephthalate) (PET) and a nanocomposite of PET with multi-walled carbon nanotubes (MWCNTs) were studied by wide and small angle X-ray diffraction and dielectric relaxation spectroscopy. The purpose was to differentiate between a heterogeneous and homogeneous stack model to describe the lamellar organization in PET and to determine the effect of carbon nanotubes ... read moreon the crystal growth in PET. The nanocomposites contained 2% MWCNT by weight, and were prepared by solution mixing, and then compression molding into film. Dielectric measurements were made at frequencies from 100 Hz to 1 MHz, in parallel plate geometry. Measurements of the samples during cold crystallization (100-120°C) were used to investigate the relationship between the growth of crystals and the restriction of the molecular mobility of the amorphous phase. Results indicate that a heterogeneous distribution of amorphous regions exists, implying both interlamellar and interfibrillar/interspherulitic placement of the amorphous chains. Addition of carbon nanotubes to the PET increased the rate of cold crystallization, but did not affect the glass transition relaxation process.read less
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