Liquid-liquid phase separation and crystallization behavior of poly(ethylene terephthalate)/poly(ether imide) blend |
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Authors: | Jong Kwan LeeWoo Suk Choi Yong Ku KwonKwang Hee Lee |
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Affiliation: | Center for Advanced Functional Polymers, School of Chemical Science and Engineering, Inha University, Inchon 402-751, South Korea |
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Abstract: | The liquid-liquid (L-L) phase separation and crystallization behavior of poly(ethylene terephthalate) (PET)/poly(ether imide) (PEI) blend were investigated with optical microscopy, light scattering, and small angle X-ray scattering (SAXS). The thermal analysis showed that the concentration fluctuation between separated phases was controllable by changing the time spent for demixing before crystallization. The L-L phase-separated specimens at 130 °C for various time periods were subjected to a temperature-jump of 180 °C for the isothermal crystallization and then effects of L-L phase separation on crystallization were investigated. The crystal growth rate decreased with increasing L-L phase-separated time (ts). The slow crystallization for a long ts implied that the growth path of crystals was highly distorted by the rearrangement of the spinodal domains associated with coarsening. The characteristic morphological parameters at the lamellar level were determined by the correlation function analysis on the SAXS data. The blend had a larger amorphous layer thickness than the pure PET, indicating that PEI molecules in the PET-rich phase were incorporated into the interlamellar regions during crystallization. |
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Keywords: | Liquid-liquid phase separation Crystallization Poly(ethylene terephthalate)/poly(ether imide) blend |
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