Star-Shaped Photoelectric Polymers Prepared By Atom Transfer Radical Polymerization

The star-shaped photoelectric polymers have excellent optoelectronic properties and show good processing properties,so they have a wide application.However,it is an urgent problem to prepare these polymers with diversified structures through simple and controllable strategy.“Living”/controlled radical polymerization techniques offer possible solutions to the problem.Among them,atom transfer radical polymerization(ATRP)is a mild and controllable polymerization method,which is applicable to a wide range of monomers.We prepared different kinds of starblock and homo-star polymers through the variation of different monomers.The photoelectric polymers were obtained using appropriate oxidation method,and their photoelectric performance were explored.In this thesis,?-cyclodextrin was modified to obtain a macromolecular initiator with 21 initiating sites.Using the modified cyclodextrin as the initiator,two star-shaped thiophene-containing polymers were prepared via two sequential ATRP.Polythiophene nanoparticles were obtained by mild oxidative crosslinking.By changing the selection of monomers and the feeding order,the thiophene-containing block could be designed in the inner or outer layer of the star polymers,thus producing solid or hollow fluorescent polythiophene nanoparticles.These nanoparticles have strong blue fluorescence,which can be regulated by different oxidation methods.In the second part,the core-first synthesis strategy was adopted to fabricate the poly(2,2,6,6-tetramethylpiperidine methacrylate)(PTMPM)using the modified cyclodextrin as the initiator.Subsequently,poly(2,2,6,6-tetramethyl piperidine-1-oxyl methacrylate)(PTMA)with different degree of polymerization and narrow distribution were obtained by oxidation.The structures of these PTMA polymers were characterized by NMR,FT-IR and GPC.Then the star PTMA polymers were used as the anode material and assembled into lithium ion battery.The electrochemical properties of the material were characterized by charge-discharge cycles.The results showed that the electrochemical properties of the star-shaped polymer can be improved by increasing the degree of polymerization.While compared with linear counterpart,the electrochemical properties of the star-shaped free radical polymers were not improved.