Study On Synthesis Of Cellulose Graft Poly(N-isopropylacrylamide)-Europium

Firstly, Cellulose acetate was synthesized as macromolecular initiator and then through atom transfer radical polymerization (ATRP), using N-isopropylacrylamide as monomer in DMF/H2O solvent with CuBr/Me6TREN as catalytic system at50℃to synthesis Cellulose grafted poly(N-isopropylacrylamide) copolymer (Cellulose-g-PNIPAM), and research the influence of the reaction conditions on the graft copolymerization; Secondly, the rare earth elements Eu(â…¢) were bonding to the polymer, realized the Eu(â…¢) ion with Cellulose-g-PNIPAM copolymer coordination. Furthermore, the polymer Cellulose-g-PNIPAM and their complexes Cellulose-g-PNIPAM-Eu(â…¢) were investigated. The results were found as follows:The kinetics of polymer Cellulose-g-PNIPAM showed a good controllability, and the polymer molecular weights distribution were narrow. The polymer Cellulose-g-PNIPAM and Cellulose-g-PNIPAM-Eu(â…¢) complexes showed a similar thermosensitive properties, but the lower critical solution temperature(LCST) values of complexes were slightly higher than the polymers. Cellulose-g-PNIPAM-Eu(â…¢) complexes presented excellent fluorescence performance, and in the fluorescence spectrum612nm showed5D0â†'7FJ(J=0,1,2,3) characteristic emission of Eu(â…¢).