Department of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, Jilin 130022, China.
Carbohydr Polym. 2013 Apr 15;94(1):77-81. doi: 10.1016/j.carbpol.2013.01.045. Epub 2013 Jan 25.
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.
通过原子转移自由基聚合（ATRP），以 N-异丙基丙烯酰胺为单体、醋酸纤维素为引发剂、CuCl/三（2-二甲氨基乙基）胺（Me6TREN）为催化体系，合成了一系列聚（N-异丙基丙烯酰胺）（PNIPAM）和纤维素的温敏共聚物。所得聚合物的多分散指数范围较窄，为 1.27-1.37，分子量为 8600-17300g/mol。然后，通过共聚物与铕（III）离子的螯合作用，形成具有优异温敏和荧光性能的新型纤维素-g-PNIPAM/Eu（III）功能配合物。配合物在 613nm 处的最大发射强度相对于相应的 Eu（III）配合物增强了约 10 倍。此外，纤维素-g-PNIPAM/Eu（III）的低临界溶液温度（LCST）略高于共聚物。
