Copolymers with fluorescence properties in mesoporous silica SBA-15:Synthesis and characterization

A novel copolymer with fluorescence properties in mesoporous silica SBA-15 was prepared via a combination of surface-initiated reversible addition-fragmentation chain transfer（RAFT） polymerization and "click" chemistry.A sufficient amount of peroxide groups were introduced into mesoporous silica SBA-15 channel pores and were further used to initiate the RAFT polymerization of styrene and 4-vinylbenzyl azide,resulting in SBA-15 supported polystyrene-co-poly（4-vinylbenzyl azide） copolymer（PS-co-PVBA/SBA-15） hybrid material.The samples were characterized by Fourier transform infrared spectroscopy（FT-IR）,transmission electron microscopy（TEM）,thermogravimetry analysis（TGA）,N;adsorption-desorption isotherms and X-ray diffraction（XRD）,respectively.The results show that the styrene and 4-vinylbenzyl azide had copolymerized inside mesoporous silica SBA-15.Subsequently,Npropargyl-carbazole（PC） was connected to PS-co-PVBA/SBA-15 hybrid material via "click" reaction,resulting in PS-co-PVBC/SBA-15 with carbazole side groups hybrid material.The fluorescence spectrum is dominated by a broad band from 350 nm to 400 nm in narrow region and the maximum peak is 362 nm,indicating the characteristic absorption of the carbazole group of PS-co-PVBC/SBA-15 hybrid material.