| Summary: | 碩士 === 國立臺北科技大學 === 有機高分子研究所 === 92 === Glass transition temperature, crystallization behavior and morphology of Poly(ethylene 2, 6-naphthalate) (PEN)/ Poly(trimethylene terephthalate) (PTT) blends of different thermal history, were investigated by using dynamic mechanical analyzer(DMA), differential scanning calorimetry(DSC), polarized-light microscopy (POM), X-ray diffraction (XRD), and Nano-indenter. From the observation of thermal analysis, it was found that PEN/PTT were partially miscible after heating for a period of time as evidenced from the appearance of a single glass transition temperature merged from two glass transition temperatures originally. The values of Avrami exponent and crystallization rate constant were found for various blend compositions at different heating times. The equilibrium melting point was obtained using the Hoffman-Weeks method. The flod surface interfacial free energy and crystal lamellar thickness have been estimated by Hoffman-Lauritzen equation and Thompson-Gibbs equation. By XRD, we found crystal size and degree of crystallinity of PEN decrease, but modulus and hardness did not vary much with heating time.
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