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Synthesis and characterization of Eu(III) complexes of modified cellulose and poly(N-isopropylacrylamide).

Carbohydrate polymers (2013-04-03)
Guihua Cui, Yanhui Li, Tiantian Shi, Zhengguo Gao, Nannan Qiu, Toshifumi Satoh, Toyoji Kakuchi, Qian Duan
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.

MATERIALS
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Sigma-Aldrich
Europium, ingot, under oil, 99.9% trace rare earth metals basis

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