title: Self-Healing, Expansion-Contraction, and Shape-Memory Properties of a Preorganized Supramolecular Hydrogel through Host-Guest Interactions.
abstract: Supramolecular materials cross-linked between polymer chains by noncovalent bonds have the potential to provide dynamic functions that are not produced by covalently cross-linked polymeric materials. We focused on the formation of supramolecular polymeric materials through host-guest interactions: a powerful method for the creation of nonconventional materials. We employed two different kinds of host-guest inclusion complexes of β-cyclodextrin (βCD) with adamantane (Ad) and ferrocene (Fc) to bind polymers together to form a supramolecular hydrogel (βCD-Ad-Fc gel). The βCD-Ad-Fc gel showed self-healing ability when damaged and responded to redox stimuli by expansion or contraction. Moreover, the βCD-Ad-Fc gel showed a redox-responsive shape-morphing effect. We thus succeeded in deriving three functions from the introduction of two kinds of functional units into a supramolecular material.
authors.affiliation: Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043 (Japan).
authors.forename: Kohei
authors.initials: K
authors.lastname: Miyamae
authors.affiliation: Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043 (Japan).
authors.forename: Masaki
authors.initials: M
authors.lastname: Nakahata
authors.affiliation: Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043 (Japan).
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Takashima
authors.affiliation: Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043 (Japan). harada@chem.sci.osaka-u.ac.jp.
authors.forename: Akira
authors.initials: A
authors.lastname: Harada
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D020100:Hydrogels / Q000737:chemistry*; D008968:Molecular Conformation; D015394:Molecular Structure
chemical_list: D001391:Azo Compounds; D020100:Hydrogels
keywords: artificial muscles; host-guest systems; self-healing; shape memory; supramolecular gels