チタニア/PDMS ハイブリッド粒子中のチタニアドメインの熱処理による相転移挙動

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  • Phase Transformation of Titania Domains in the Titania/PDMS Hybrid Particles by Heat Treatment

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Thermal transformation of a previously reported spherical titania/PDMS hybrid particles (J. Mater. Sci., Vol. 39, pp. 4131-4137 (2004)) is investigated in the temperature range from 500 to 1200°C, in air, by means of differential thermal analysis (DTA), thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), N2 adsorption/desorption, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The hybrid particles had an islet-like nano-structure, which consisted of titania and PDMS domains of a nanometer size. The amorphous titania domains were transformed to anatase by a heat treatment above 500°C accompanying densification, while there was no significant change in the titania domain size by the heat treatment at 900°C for 2 h. The silicone domains of the hybrid particles were transformed to amorphous silica completely by the thermal decomposition of the organic groups of the silicone at 700°C for 2 h. After a heat treatment at 1200°C for 2 h, the titania crystallites in the particle partly transformed to rutile and grew by diffusion and fusion of the titania domains accompanying a morphological change of the particles. On the other hand, the silica domains remained amorphous.<br>

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