PREPARATION AND CHARACTERIZATION OF NANO-TITANIA-SILICA BINARY MIXED OXIDE AND PLA COMPOSITE ON MECHANICAL, THERMAL AND MORPHOLOGICAL PROPERTIES
Keywords:
Mixed oxide, Sol-gel method, Titania, silica, nanocompositesAbstract
This paper presents the preparation and characterization of titania-silica binary mixed oxide (TixSiy) and PLA composite on mechanical, thermal and morphological properties. TixSiy was prepared via sol-gel method to be used as nucleating agent for PLA with 1:1 molar ratio of Ti/Si. Tix-Siy Titanium(IV) isopropoxide (TTIP) and tetraethylorthosilicate (TEOS) were used as Ti and Si precursor, respectively. The structural and chemical properties of TiO2-SiO2 were characterized by Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscope (FE-SEM) and powder X-ray diffraction (XRD). In addition, the chemical compositions were analyzed by energy dispersive X-ray fluorescence (XRF). The FTIR spectra showed the band at 949 cm-1 of Ti50Si50 mixed oxide associated with Ti-O-Si vibration indicating the forming of chemical bond between TiO2 and SiO2. PLA nanocomposite films were prepared by solvent film casting method at various contents of mixed oxide (1, 3, and 5 wt%). The incorporation of Ti50Si50 decreased cold crystallization temperature (Tcc) of PLA and increased degree of crystallinity of neat PLA. Thermal stability of PLA was enhanced with the incorporating of TiO2 and SiO2. The addition of 3wt% of Ti50Si50 into PLA film exhibited the best tensile strength and Young’s modulus comparing to PLA and other PLA composites but low %elongation at break.
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