Photo-Reversible Supramolecular Hydrogels Assembled by α-Cyclodextrin and Azobenzene Substituted Poly(acrylic acid)s: Effect of Substitution Degree, Concentration, and Tethered Chain Length

Mingwei Wang, Xiaojun Zhang, Li Li*, Junyou Wang, Jie Wang, Jun Ma, Zhenyu Yuan, Stephen F. Lincoln, Xuhong Guo

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

15 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)191-198
JournalMacromolecular Materials and Engineering
Volume301
Issue number2
DOIs
Publication statusPublished - 2016

Keywords

  • Azobenzene
  • Photo-responsive
  • Polymeric hydrogel
  • Rheology
  • α-Cyclodextrin

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