| 초록 |
The morphology of an extruded poly(ethylene terephthalate) (PET)/ polycarbonate (PC) blend was investigated by differential scanning calorimetry (DSC), light scattering (LS) and small angle X-ray scattering (SAXS). Measurements were made as a function of annealing time in the melt, probing the morphologies at both the spherulitic and lamellar levels. At crystallization temperature of 180 °C the increased amorphous layer thickness, la, indicated that some PC was incorporated into the interlamellar regions of PET during crystallization. With increasing ts, a large increase of lamellar thickness, lc, was exhibited because of melting point depression and unusual secondary crystallization behavior by transesterification. From the observations of LS, we concluded that the crystal growth habit of the blend was significantly affected by either the composition change of the separated phases or the change of the sequence distribution in polymer chains determined by the level of transesterification.
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