Smart light-responsive brush copolymers grafted TiO2 nanoparticles using SI-ATRP method
Paper ID : 1224-ICNS
Fakhri Arjmand *
Department of Chemistry, Institute for Advanced Studies in Basic Sciences, Zanjan, Iran
Progress of light-responsive nano-objects, whose properties can be reversibly changed by a remote stimulus with spatial and temporal control, such as light irradiation of specific wavelength, is greatly desirable. Surface-initiated atom transfer radical polymerization (SI-ATRP) methods provide control over the quantity of the phtochromic dye to be attached covalently to a polymer matrix. Here, spiropyran ethylacrylate (SPEA) and glycidyl methacrylate (GMA) monomers were covalently grafted onto the surface of titanium dioxide nanoparticles (TiO2) using SI-ATRP method. UV-Vis absorption spectra of the grafted copolymers showed the conversion of spiropyran to merocyanine under UV light. From atomic force microscopy (AFM), we observed after grafting of the polymer onto the surface, the size of the titanium dioxide nanoparticles increased reflecting the appropriate modification of the nanoparticles surface. The prepared brush copolymers containing spiropyran groups were used as reversible, photoswitchable optical sensors. A slight colour change of the copolymer dispersion after complexation with divalent cations was also observed.
Photochromic, Spiropyan, TiO2, Surface-initiated atom transfer radical polymerization
Status : Abstract Accepted (Poster Presentation)