Title
Reversing Redox Responsiveness of Hydrogels Due to Supramolecular Interactions by Utilizing Double-Network Structures.
Author
Shingo Tamesue, Shingo Noguchi, Yuko Kimura, Takuo Endo
Year
2018
Journal
ACS Applied Materials & Interfaces
Abstract
Stimuli responsive hydrogels have been actively researched, and some of them have been put into practical use. When we create and use stimuli responsive hydrogel materials, controlling stimuli responsiveness of hydrogels is very import issue. In this research, we prepared hydrogels having single-network (SN) or double-network (DN) gel structures with the host–guest interaction groups cyclodextrin and methylviologen and evaluated their stimuli responsiveness. The results of the tensile and compression tests showed that the hydrogels with SN and DN structures exhibited opposite stimuli responsiveness in response to the redox reaction of methylviologen through the association and dissociation of the host molecule, β-cyclodextrin, and the guest molecule, methylviologen. Spectroscopic measurements and rheological studies all indicated that this difference in stimuli responsiveness originated from the polymer-network structures. In addition, a chemically cross-linked DN gel was prepared and its redox re-sponsiveness was evaluated.
Full Article
Instrument
J-820
Keywords
Circular dichroism, Induced circular dichroism, Chemical stability, Polymers, Materials