A Study on Morphology Development on PET/PTT Blend

초록

If both components of a binary blend crystallize at the same time, a wide variety of morphological patterns may be encounted. In addition to crystallization, morphologies of crystalline polymer blends may sometimes be influenced by a liquid-liquid(L-L) demixing process. When the blend has a phase diagram, crystallization may proceed simultaneously and compete with L-L phase separation. The competitive two processes may create unique morphological patterns that are not attainable by either process alone. Recently, we observed that the blend of poly(ethylene terephthalate) induced by combined crystallization and L-L demixing. In this work, we described a study of the morphological change in the PET/PTT blend at both the spherulitic and lamellar levels. The morphology was investigated with optical microscopy (fig.1), light scattering (fig.2), and small angle X-ray scattering(SAXS). Measurements were made as a function of annealing time in the melt and of crystallization temperature. The crystallization and the melting behavior were also examined using differential scanning calorimetry(DSC).