A novel thermoresponsive hydrogel with ion-recognition property through supramolecular host-guest complexation
- Authors
- Ju, Xiao-Jie; Chu, Liang-Yin; Liu, Li; Mi, Peng; Lee, Young Moo
- Issue Date
- Jan-2008
- Publisher
- AMER CHEMICAL SOC
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY B, v.112, no.4, pp.1112 - 1118
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF PHYSICAL CHEMISTRY B
- Volume
- 112
- Number
- 4
- Start Page
- 1112
- End Page
- 1118
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/179131
- DOI
- 10.1021/jp709746w
- ISSN
- 1520-6106
- Abstract
- A novel thermoresponsive hydrogel with ion-recognition property was prepared via free-radical cross-linking copolymerization of N-isopropylacrylamide (NIPAM) with benzo-18-crown-6-acrylamide (BCAm) as host receptor. Both chemical structures and stimuli-sensitive properties of the prepared poly(N-isopropylacrylamide-co-benzo-18-crown-6-acrylamide) P(NIPAM-co-BCAm) hydrogel were characterized. The smart hydrogel could respond to both temperature and ion stimuli. When the crown ether units captured Ba2+ and formed stable BCAm/Ba2+ host-guest complexes, the lower critical solution temperature (LCST) of the hydrogel increased due to the repulsion among charged BCAm/Ba2+ complex groups and osmotic pressure within the hydrogel. Whereas crown ethers captured Cs+, the LCST shifted to a lower temperature because of the formation of 2:1 sandwich complexes. Unexpectedly, the LCST of the cross-linked P(NIPAM-co-BCAm) hydrogel in K. solution did not shift to a higher temperature, which was definitely different from the previously reported linear P(NIPAM-co-BCAm) copolymer in K+ solution. The results of this work provide valuable information for development of dual thermo- and ion-responsive hydrogels which have potential applications in drug control led-release systems or biomedical fields.
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