Abstract
Nano-SiO2 is hydrophilic, and the surface of nano-SiO2 should be modified to improve its dispersion in a polymer matrix. Here, triallyl isocyanurate was selected to modify the surface of the nano-SiO2 powders. Because the reaction between isocyanate groups (−NCO) and hydroxyl groups (−OH) on surface of the nano-SiO2 does not need any pre-treatment, one single and simple step can facilitate the graft. By optimizing the specific modification process via orthogonal experiments, optimal processing conditions that yield good graft modification effects are obtained. This enhances the lipophilicity of the nano-SiO2. The Fourier-transform infrared spectrometer (FTIR) results indicate that the isocyanate groups (−NCO) in triallyl isocyanurate and the hydroxyl groups (−OH) on surface of the nano-SiO2 undergo a chemical reaction. Further, the precipitation data show that modified nano-SiO2 is well dispersed in the organic phase, and its hydrophobic property is strong. This fulfills the goal of modifying nano-SiO2 powders.
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