engleski

PREPARATION AND CHARACTERIZATION OF AMINE FUCTIONALIZED TiO2 NANORIBBONS-EPOXY NANOCOMPOSITES

Functionalized TiO2 nanoribbons were prepared with and without prehydrolysis of 3-(aminopropyl)tri-ethoxysilane (APTES), and characterized by simultaneous differential scanning calorimetry-thermogravimetric analysis (DSC-TGA) and scanning electron microscopy (SEM). After the functionalization nanoribbons were used to prepare TiO2 nanoribbons-epoxy nanocomposites. In situ crosslinking of epoxy with diamine and varying epoxy/TiO2 nanoribbons mass ratios were performed. The influence of TiO2 nanoribbons (filler) on the physical, chemical and mechanical properties of the polymer depends on the distribution, filler/polymer surface interactions and a size of a filler. Usage of functionalized fillers improves above mentioned properties. The thermal and mechanical properties of prepared nanocomposites were studied by differential scanning calorimetry (DSC), DSC-TGA and dynamic mechanical analysis (DMA). The level of dispersion and homogeneity of functionalized TiO2 nanoribbons in the epoxy matrix was determined by scanning electron microscopy. The results of thermal analysis show that functionalized TiO2 nanoribbons increases glass-transition temperature of epoxy matrix. Thermal stability of nanocomposites also increases with increased loading of functionalized TiO2 nanoribbons. The storage modulus determined by DMA increases with increasing nanoribbons content, but increase is relatively small. Loss modulus as well as Tan delta (dumping) increases with increasing nanoribbon content, especially in nanocomposites prepared from prehydrolysed TiO2 nanoribbons. SEM images show homogeneous distribution of functionalized TiO2 nanoribbons in epoxy matrix.

TiO2 nanoribbons; epoxy; nanocomposites

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