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Photo‐Reversible Supramolecular Hydrogels Assembled by α‐Cyclodextrin and Azobenzene Substituted Poly(acrylic acid)s: Effect of Substitution Degree, Concentration, and Tethered Chain Length
Author(s) -
Wang Mingwei,
Zhang Xiaojun,
Li Li,
Wang Junyou,
Wang Jie,
Ma Jun,
Yuan Zhenyu,
Lincoln Stephen F.,
Guo Xuhong
Publication year - 2016
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201500295
Subject(s) - azobenzene , cyclodextrin , self healing hydrogels , materials science , polymer chemistry , supramolecular chemistry , polymer , rheology , ultraviolet visible spectroscopy , crystallography , chemistry , organic chemistry , composite material , crystal structure
Photo‐reversible supramolecular hydrogels based on the mixture of α‐cyclodextrin (α‐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 α‐CD. The binding constant between α‐cyclodextrin and azobenzene, which were determined by UV–Vis spectroscopy, showed a strong dependence on the length of tethered chain.