期刊
CARBOHYDRATE POLYMERS
卷 94, 期 1, 页码 77-81出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.01.045
关键词
Poly(N-isopropylacrylamide) Cellulose; Atom transfer radical polymerization (ATRP); Lower critical solution temperature (LCST); Fluorescence
资金
- National Natural Science Foundation of China [50903009]
- Jilin Science & Technology Department
- Science and Technology Development Project [20070556, 20100115, 201201120]
- Science and Technology Bureau of Changchun City Project [2008280]
- Foundation for Strategical Research
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. (C) 2013 Elsevier Ltd. All rights reserved.
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