本研究利用微分掃描熱卡計（DSC）、偏光顯微鏡（POM）、掃描式電子顯微鏡（SEM）、廣角X光繞射儀（WAXD）及核磁共振儀（1H-NMR），探討poly(pentamethylene terephthalate) /poly(ether imide) (PPT/PEI)、poly(hexamethylene terephthalate) /poly(ether imide) (PHT/PEI)兩成分摻合系統，及poly(ethylene 2,6-naphthalate) /poly(pentamethylene terephthalate) /poly(ether imide) (PEN/PPT/PEI)、poly(ethylene 2,6-naphthalate) /poly(trimethylene terephthalate) /poly(ether imide) (PEN/PTT/PEI)三成分摻合系統之相形態、相容性與結晶行為。在PPT/PEI與PHT/PEI兩成分摻合系統中，經POM觀察相形態及DSC分析Tg，證實此兩成分摻合系統為不相容。經計算得分子間作用力參數（X12）於PPT/PEI之X12=0.12±0.01、PHT/PEI之X12=0.17±0.01；並進一步發現主鏈上碳數增加使aryl polyester/PEI間作用力減弱，使系統由相容轉變為相分離。在PEN/PPT/PEI與PEN/PTT/PEI三成分摻合系統中，以POM及DSC發現PEN/PPT/PEI摻合為不相容，而PEN/PTT/PEI摻合為部分相容；但兩系統經高溫熱處理則所有組成變為均相。以1H-NMR分析證實交酯化反應(transesterification)發生於PEN/PPT及PEN/PTT間並產生共聚合物。本實驗進一步觀察反應對摻合物的玻璃轉化行為、溶解度及結晶行為的影響，並提出解釋。最後利用PEN/PPT及PEN/PTT交酯化產生的共聚合物ENPT及ENTT與PEI摻合，經POM及DSC分析發現ENPT/PEI及ENTT/PEI為相容之摻合系統；並進一步發現ENPT對PPT/PEI摻合具有助容劑(compatibilizer)的效應。

Miscibility and morphology of poly(pentamethylene terephthalate)/ poly(ether imide) (PPT/PEI), poly(hexamethylene terephthalate) /poly(ether imide) (PHT/PEI), poly(ethylene 2,6-naphthalate)/ poly(pentamethylene terephthalate)/poly(ether imide) (PEN/PPT/PEI), and poly(ethylene 2,6-naphthalate)/poly(trimethylene terephthalate) /poly(ether imide) (PEN/PTT/PEI) blends were investigated by using differential scanning calorimeter (DSC), polarized-light microscopy (POM), scanning electron microscopy (SEM), wide-angle X-ray diffraction (WAXD), and proton nuclear magnetic resonance (1H-NMR). For PPT/PEI and PHT/PEI blends, POM showed phase heterogeneity, and two glass transition temperatures (Tg) were obtained in DSC. These results demonstrated immiscibility. Polymer-polymer interaction parameter (X12) was calculated and found to be 0.12±0.01 for PPT/PEI blends and 0.17±0.01 for PHT/PEI blends. The relationship between amount of methylene groups of aryl polyester and miscibility was also discussed. For ternary blends, POM and DSC results indicated immiscibility for PEN/PPT/PEI blends and partial miscibility for PEN/PTT/PEI blends, but all components of these two ternary blends were phase homogeneous after heat treatments. 1H-NMR results indicated the generation of PEN/PPT and PEN/PTT copolymers by so-called “transesterification”. The influence of transesterification on the behaviors of glass transition, solubility and crystallization was discussed in detail. Finally, the transesterification products of PEN/PPT and PEN/PTT blends, ENPT and ENTT, were blended with PEI respectively. The results of POM and DSC demonstrated the miscibility of ENPT/PEI and ENTT/PEI blends. In addition, the compatibilizing effect of ENPT on PPT/PEI blends in their ternary mixture was also shown.

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