Preparation of TiO2-PDA core-shell structure and TiO2-PDA/silicone rubber composites
The dopamine monomers were polymerized on the surface of nano-titanium dioxide particles to form TiO2-polydopamine(PDA)core-shell structure which was blended with silicon rubber(SR)to prepare TiO2-PDA/SR composites,whose structure and properties were observed.The results show that the introduction of dopamine monomer increases the dispersion and compatibility of TiO2.The dispersion of TiO2 particle coated with PDA is significantly improved,a relatively clear core-shell structure is formed.PDA is stably and firmly self-polymerized on the outer layer of nano-TiO2 particle,which is not easy to fall off.The initial decomposition temperature of TiO2-PDA/SR is increased from 450.44℃to 468.01℃,and the microstructure of the composites is sea-island structure.
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