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

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• 作者：Guihua Cui^a ; ^b ; Yanhui Li^a ; Tiantian Shi^c ; Zhengguo Gao^d ; Nannan Qiu^a ; Toshifumi Satoh^e ; Toyoji Kakuchi^e ; Qian Duan^a ; ^{duanqian88@hotmail.com}
• 关键词：Poly(N-isopropylacrylamide) ; Cellulose ; Atom transfer radical polymerization (ATRP) ; Lower critical solution temperature (LCST) ; Fluorescence
• 刊名：Carbohydrate Polymers
• 出版年：2013
• 出版时间：15 April, 2013
• 年：2013
• 卷：94
• 期：1
• 页码：77-81
• 全文大小：554 K

文摘

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.