Synthesis Of Block Copolymer Raft Polymerization Method And Nano Fluorescent Materials Research

In this paper, the two block copolymers (the amphiphilic block compolymer and thermoresponsive block copolymer) were synthesized by the mothod of reversible addition fragmentation chain transfer (RAFT) radical polymerization and fluorescent moleculars with excellent optical performance were utilized to connect with polymer via chemical bonds. It is realized that fluorescene functioned polymer materials are successfully synthesized and fluorescence moleculars are allowed to be a uniform and stable distribution in the polymers. The fluorescence properties of fluorescent polymers composite were also investigated after in addition of polymers.The fluorescent rare earth complexes with good luminescent performance were designed and synthesized. Here, the trithiocarbonate4-cyano-4-ethyl trithio benzyl pentanoate as RAFT reagent was fristly synthesized and then Poly(methyl methacrylate)-b-poly(tert-butyl acrylate) was synthesized by RAFT polymerization and then poly(tert-butyl acrylate) subjected to hydrolyze with trifluoroacetic acid to become polyacrylate. The preparation of fluorescent rare earth complexes was achieved in two steps: first, the coordination between Eu3+ion and the carboxyl groups of polyacrylic acid; second, the addition of phenanthroline(phen) to rare earth polymer. And then fluorescence performance of the systemas well as the morphology of the material was studied.The thermoresponsive fluorescent silver@polymer nanohybirds with switchable metal enhanced fluorescence was successful modified. The preparation of fluorescent nanohybrids was obtained in three steps. Frist, block copolymer of PNIPAM-b-Pt-BA was synthesized by RAFT free radical polymerization with RAFT reagent3-Benzylsulfanylthiocarbonylsufanyl propionic acid and PNIPAM-b-PAA was prepared from the hydrolysis of block compolymer, PNIPAM-b-Pt-BA,in the presence of trifluoroacetic acid. Second, the polymer was attached onto AgNPs via Ag-sulfur coordination. Third, rhodamine (RB) as fluorophore was tailored with hydroxyl groups to facilitate esterfication coupling with PAA to achieve the covalent attachment of RB on the silver nanoparticles.The thermoresponsive properties of PNIPAM was exploited to change the space between the silver nanoparticles and a fluorophore to study metal-enhanced fluorescence of Ag nanoparticles to RB fluorophore in liquid system.The block copolymers were synthesized by RAFT polymerization and the fluorescent composites were successfully preparation.