成核劑表面改質對聚-3-羥基丁酸酯之結晶與劣化性質影響研究

The effects of the surface treatments of inorganic fillers on the crystallization and thermal degradation properties of polyhydroxybutyrate (PHB) are studied using differential scanning calorimetry (DSC), Fourier transformed infrared spectroscopy (FTIR), polarized light microscope (POM), wide angle x-ray diffraction (WAXD), and themgravimetric analysis (TGA). From FTIR and TGA analyses, it is indicated that the fumed silica can be effectively grafted with the reactive silanes and long chain amides. The thermal degradation of PHB can be significantly improved by the addition of only one part per hundred PHB (phr) inorganic silica or other modified silica. The results of DSC indicate that PHB with 2 phr hydrophobic silica can have the greatest increases of the thermal stability, crystallization rate, and crystallinity. The use of the amide modified silica can effectively decrease the melt-recrystallization extent of PHB near the melting temperature. The crystal size of PHB decreases with the addition of the silica. The crystallization kinetic parameters of PHB are also changed by the type of silica added.