| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 98 === Specific intermolecular interactions, miscibility and spherulite morphology were investigated in the blend of poly(ethylene succinate) (PESu) and tannic acid (TA) using differential scanning calorimetry (DSC), polarized optical-light microscopy (POM), Fourier-transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and atomic force microscopy (AFM).
PESu/TA blend is proved to be miscible in melt and amorphous glassy states. In addition, PESu/TA blends exhibit specific intermolecular hydrogen bonding interactions between the carbonyl groups of PESu and the hydroxyl groups of TA. Such strong intermolecular hydrogen bonding interactions shows great influence on the spherulitic morphology of PESu in blends. PESu shows normal Maltese-cross spherulite and upon blending with TA, the spherulite morphology of PESu changes to leaf-like (TA=10wt%) and then changes to seaweed morphology (TA=20wt%). Film thickness also influences the spherulite morphology of PESu. With the decrease of PESu film thickness, the normal Maltese-cross spherulite of PESu becomes leaf-like. The trend in the change of spherulite morphology of PESu upon blending with TA is similar to that of PESu with decreasing film thickness. PESu shows dendrite morphology in blend with 20wt% TA and in low film thickness= 1 ?m. The seaweed morphology in PESu/TA=80/20 is composed of regular arrangement of lozenge single crystals. The dendrite in PESu/TA=80/20 is composed of right-handed and left-handed lozenge plate arrangement of spiral growth crystals.
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