Abstract
The binary blends of poly(ethylene terephthalate) (PET) and poly(ether imide) (PEI) were miscible in the melt but showed simultaneous crystallization and liquid−liquid demixing below the melting point. In this study, the morphological structure induced by the coupling of crystallization and liquid−liquid phase separation in PET/PEI blends was probed by small-angle X-ray scattering (SAXS). For the semicrystalline blends, a drastic intensity rise at low scattering angle superposed the scattering peak associated with the lamellar stacks. This low-angular scattering was attributed to the electron density contrast between the “lamellar stack domains” (LS domains) consisting of alternating crystalline/amorphous layers and the PEI-rich domains located outside the LS domains. The scattering profiles were deconvoluted by applying the Debye−Bueche model to calculate the scattering intensity associated with the contrast between LS domains and PEI-rich domains. The morphological parameters, such as crystal thickness,...
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