Synthesis, Characterization of POSS-PPE Hybrid Materials and Fluorescence Response to TNT

Three kinds of novel fluorescent conjugated poly(phenylene ethynylene)(PPE) containing pentiptycene group were synthesized via Heck Sonogash FT-IRa coupling method. They were PPE 1 with dissymmetrical alkoxyl substitutes and PPE 2, PPE 3 with nomo , di polyhedral oligomeric silsesquioxanes (POSS) substitutes on the FT IR side chains was prepared. The structure and properties of copolymers were characterized by FT-IR, 1HNMR, UVVis, fluorescence emission spectra, TGA, and the fluorescence response to TNT was investigated. Results indicated that PPE 1、2、3 showed good fluorescence properties, high fluorescence quantum yield, and excellent quenching sensitivity to TNT. The fluorescence quenching efficiency with TNT concentration curve showed a nonlinear relationship, especially, the PPE 2 with a single POSS on the side chain improved the fluorescence quantum yield and fluorescence quenching efficiency for TNT. TGA test showed that the thermal stability of the PPE 2、3 with POSS were significantly higher than that of the PPE 1 without POSS.