title: Synthesis and characterization of Eu(III) complexes of modified cellulose and poly(N-isopropylacrylamide).
abstract: A series of thermo-responsive copolymers of poly(N-isopropylacrylamide) (PNIPAM) and cellulose were synthesized via atom transfer radical polymerization (ATRP) using N-isopropylacrylamide as the monomer, cellulose acetate as the initiator, and CuCl/tris(2-dimethylaminoethyl)amine (Me6TREN) as a catalytic system. The resulting polymers had a narrow range of polydispersity indexes 1.27-1.37, and molecular weights of 8600-17,300 g mol(-1). Novel functional complexes of cellulose-g-PNIPAM/Eu(III) with excellent thermosensitive and fluorescent properties were then formed by the chelation of copolymers and europium(III) ions. The maximum emission intensity of the complexes at 613 nm was enhanced by a factor of approximately 10 relative to that of the corresponding Eu(III) complexes. Additionally, the lower critical solution temperatures (LCSTs) of cellulose-g-PNIPAM/Eu(III) were slightly greater than those of the copolymers.
authors.affiliation: Department of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, Jilin 130022, China.
authors.forename: Guihua
authors.initials: G
authors.lastname: Cui
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Li
authors.forename: Tiantian
authors.initials: T
authors.lastname: Shi
authors.forename: Zhengguo
authors.initials: Z
authors.lastname: Gao
authors.forename: Nannan
authors.initials: N
authors.lastname: Qiu
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Satoh
authors.forename: Toyoji
authors.initials: T
authors.lastname: Kakuchi
authors.forename: Qian
authors.initials: Q
authors.lastname: Duan
mesh_terms: D000178:Acrylamides / Q000737:chemistry*; D000180:Acrylic Resins; D002482:Cellulose / Q000031:analogs & derivatives* / Q000138:chemical synthesis* / Q000737:chemistry; D002614:Chelating Agents / Q000138:chemical synthesis* / Q000737:chemistry; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D005063:Europium / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000138:chemical synthesis* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D011108:Polymers / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics
chemical_list: D000178:Acrylamides; D000180:Acrylic Resins; D002614:Chelating Agents; D056831:Coordination Complexes; D005456:Fluorescent Dyes; D011108:Polymers; C052970:poly-N-isopropylacrylamide; D005063:Europium; D002482:Cellulose