Abstract
The grafted modification TiO(2)@SiO(2) composite was fabricated by a liquid-phase deposition method with Na(2)SiO(3) and a grafting reaction with a silane coupling agent. First, the TiO(2)@SiO(2) composite was prepared, and the effect of deposition rate and silica content on the morphology, particle size, dispersibility, and pigmentary property of TiO(2)@SiO(2) composites was investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and ζ-potential. The islandlike TiO(2)@SiO(2) composite had a good particle size and printing performance compared with the dense TiO(2)@SiO(2) composite. The presence of Si was confirmed by EDX elemental analysis and XPS, and a peak at 980 cm(-1) belonging to Si-O was observed in the FTIR spectrum, confirming the presence of SiO(2) anchored at TiO(2) surfaces via Si-O-Ti bonds. Then, the islandlike TiO(2)@SiO(2) composite was modified by grafting with a silane coupling agent. The effect of the silane coupling agent on the hydrophobicity and dispersibility was investigated. The peaks at 2919 and 2846 cm(-1) belong to CH(2) in the FTIR spectrum, and Si-C in the XPS confirmed the grafting of silane coupling agent to the TiO(2)@SiO(2) composite. The grafted modification of the islandlike TiO(2)@SiO(2) composite using 3-triethoxysilylpropylamine endowed it with weather durability, dispersibility, and good printing performance.