Copolymerization Of Styrene Monomers With Maleic Anhydride And Its Application In Functionalization

With the rapid development of controlled radical polymerization,polymerization induced self-assembly(PISA)has been studied more widely and deeply.PISA can prepare nanoparticles with various forms at high concentrations,which provides the possibility for large-scale industrial production.However,an important problem at present is that there are still few monomer/solvent systems suitable for industrial production,especially PISA in disperse polymerization system.Based on this problem,it is of great significance to use RAFT polymerization to explore the PISA of styrene-maleic anhydride,which is cheap and easy to modify,and its functional application.We synthesized poly(N,N-dimethylacrylamide)(PDMA)and polyisoprene(PI)with different degree of polymerization and used them as solvophilic chain segments and styrene-maleic anhydride copolymer as solvophilic chain segments respectively.The influence of different hydrophilic and hydrophobic segment ratio and solid content on the morphology of the assembly was investigated in chloroform and isoamyl acetate solvents,respectively.The morphology and particle size of the assembly were characterized by TEM and DLS.The assembly(PDMA85b-(St-alt-MAn)300)was applied to the immobilization of catalase due to a large number of highly active anhydride groups on the surface of the assembly.By comparing the catalytic performance of immobilized catalase and free catalase for hydrogen peroxide solution,it was found that the immobilized catalase showed higher acid,alkali and temperature tolerance,and more importantly,the immobilized catalase had excellent recycling ability.Styrene-maleic anhydride copolymer(SMA)is an important functional polymer,which has good heat resistance,wear resistance and dimensional stability.The electron donating ability of styrene monomer was enhanced by modifying two naphthalene groups and copolymerization with maleic anhydride.Next,through four steps of organic synthesis,we prepared the acceptor with hydroxyl groups 2-(4-hydroxyphenyl)-6,7dicyanoquinoxaline(OH-QCN)and used it in the copolymer of the anhydride group grafting ring opening reaction,so as to prepare the electroluminescent polymer with through space charge transfer(TSCT)property.The structures of the intermediate products and copolymers of each step were characterized by NMR,FTIR and XPS respectively.The prepared polymer is expected to be used in electroluminescent devices.