Photo‐Reversible Supramolecular Hydrogels Assembled by α‐Cyclodextrin and Azobenzene Substituted Poly(acrylic acid)s: Effect of Substitution Degree, Concentration, and Tethered Chain Length. Issue 2 (14th September 2015)

• Record Type: Journal Article
• Authors: Wang, Mingwei; Zhang, Xiaojun; Li, Li; Wang, Junyou; Wang, Jie; Ma, Jun; Yuan, Zhenyu; Lincoln, Stephen F.; Guo, Xuhong
• Is Part Of: Macromolecular materials and engineering. Volume 301:Issue 2(2016)
• Page Start: 191
• Page End: 198
• Publication Date: 2015-09-14
• Subjects: α‐Cyclodextrin -- azobenzene -- photo‐responsive -- polymeric hydrogel -- rheology; Plastics -- Periodicals; Polymers -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1002/mame.201500295
• Languages: English
• ISSNs: 1438-7492

Abstract

Abstract : 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. Abstract : Photo‐reversible polymeric hydrogels are prepared by α‐cyclodextrin and azobenzene substituted poly(acrylic acid) s. Effects of substitution degree, tethered chain length, and polymer concentration on construction of these functional materials are investigated systematically.