The Preparation Of New Fluorescent Conjugated Polymer PPE Containing Polyhedral Oligomeric Silsesquioxane And With The Response Research Of Nitro (TNT) Explosives

In recent years, conjugated polymers based fluorescent sensor has been developed rapidly with its high selectivity, sensitivity and stability, with a very wide application prospects. Rigid conjugated main chain is an important feature of conjugated polymers, which allows electronic/energy free flow in the entire chain, the energy collected by each monomer can be set out in the form of transfer for a set of response functions and a signal multiplier effect. Therefore, a single quencher molecules can enough cause super-quenching of polymer fluorescence.the nature indicates that it has the ability to detect low content of analytes, which provdes a good way to achieve high sensitivity for detecting explosives.At present.more typical is the T.M.Swager study group report series poly(phenylene ethynylene)s PPEs with rigid pentiptycene structure, which is currently reported the one of highest sensitivity fluorescent sensor materials. Because The bulky, rigid pentiptycene moieties can prevent interchainπ-stacking, which has a high fluorescence quantum yield and shows higher responsiveness and detection sensitivity of multi-nitro-aromatic compounds. In recent years, The research report of polyhedral oligomeric silsesquioxanes(POSS) is more and more. Due to the organic/inorganic hybrid molecules containing POSS usually have high thermal stability, good luminous properties and other characteristics, POSS modified light emitting material has become a new hotspot in the field of optoelectronic domain.In this paper, Aimed at such shortcomings of PPEs in optical stability and resistance to light and heat aging, and solubility and film forming properties, successfully synthesized the new PPEs covered with POSS by Heck-Sonogashira coupling reaction based on the research of Swager etc.With the rigid pentiptycene moieties, selecting the appropriate alkoxy side chains and the introduction of macromolecules POSS groups. Given the PPEs good heat resistance, solubility and luminescent properties. This has not seen reports at home and abroad. By NMR, IR, GPC, DSC and other methods to characterize its structural properties, identified as the target product. And application of UV absorption and fluorescence emission spectra to analysis the fluorescent effect that show these are high polymer fluorescence intensity, is a kind of good fluorescence sensor materials. And to study the TNT concentration and time on the polymer fluorescence quenching that found TNT had very good sensitivity of fluorescence quenching to such polymers. At the same time synthesis the excluding of POSS PPE as contrast, and studys its structure and fluorescence performance and the response.of the explosives.