Porous and nonporous nanocomposite microspheres were successfully prepared by grafting titania (TiO2) particles to poly(styrene-co-divinylbenzene) microsphere involving silane coupling agent 3-glycidoxypropyltri-methoxysilane (KH560), styrene and maleic anhydride as coupling agents. The effects of KH560 and styrene on the dispersion and amount of grafted-titania on the surface of the microsphere (nonporous) as well as the effect of porous properly of the supporting microsphere on the amount of grafted-TiO2 within the microsphere (porous) were investigated. The results indicated that both KH560 and styrene could enhance the stability and dispersion of TiO2 particles attached to the surface of the microsphere producing grain size with diameter in the range of 30-80 nm. With nonporous microsphere styrene also increased the amount of grafted-TiO2 particles on the microsphere from 10.4% to 20.4% as revealed by TGA. Porous nanoeomposite microspheres with mean pore size of 136 nm could accommodate more TiO2 particles larger than either nonporous nanocomposite or porous nancomposite with mean pore size of 31 nm, yielding maximum of 26% by weight of grafted-TiO2.
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