Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 301, Issue 2, Pages 191-198Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.201500295
Keywords
-Cyclodextrin; azobenzene; photo-responsive; polymeric hydrogel; rheology
Funding
- NSFC [20774030, 51273063, 21476143]
- Fundamental Research Funds for the Central Universities
- high school specialized research fund for the doctoral program [20110074110003]
- 111 Project Grant [B08021]
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Photo-reversible supramolecular hydrogels based on the mixture of -cyclodextrin (-CD) and azobenzene (Azo) substituted poly(acrylic acid) s were prepared. Effects of substitution degree of Azo, polymer concentration and tethered chain length on the reversible sol-gel transition of these mixtures trigged by Ultraviolet-Visible (UV-Vis) radiation were investigated through rheology and UV-Vis spectroscopy. Their zero-shear viscosities enhanced upon increasing substitution degree of Azo, polymer concentration, and the tethered chain length between Azo grafts and backbone, while the zero viscosities decreased upon adding free -CD. The binding constant between -cyclodextrin and azobenzene, which were determined by UV-Vis spectroscopy, showed a strong dependence on the length of tethered chain.
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