writer：H. W. Zhou,* F. S. Liang, J. Li, X. B. Ding, A. J. Ma,W. X. Chen, C. Y Luo, G. Zhang, W. Tian, M.
keywords：copolymers, terpyridine
source：期刊
specific source：Reactive and Functional Polymers, 2016, 106, 62-68
Issue time：2016年
Introduction of new components is an effectiveway to gain new functionalities and to regulate the

properties of responsive polymers. In the presentwork, a RAFT polymerization approach to terpyridine-containing poly(N-isopropyl acrylamide) (PNIPAAm) copolymers was developed and the dually responsive behavior of the obtained polymer to temperature variation and metal ions in dilute solutions were investigated. By utilizing RAFT polymerization, the molecular weight polydispersity index of the polymer can be reduced compared with the traditional free radical polymerizationmethod. Due to the coexistence of thermosensitive component and terpyridine, the synthesized polymer is thermosensitive and metal ion sensitive. Further titration investigation revealed that this polymermay be utilized as a water-soluble and colorimetric sensor for Fe2+ and Fe3+ and the obvious color change froma colorless state to a purple statemakes the polymer a potential sensor to detect Fe2+ and Fe3+macroscopically by naked eye.Overall, the terpyridine-containing poly(N-isopropyl acrylamide) copolymersmay enrich the family of terpyridine-containing polymers and provide some clues for developing newmulti-responsive and multi-functional polymers.