Abstract
Previously, we have reported a single-step preparation method for a topological gel by copolymerizing isoprene and vinyl-modified β-cyclodextrin (V-β-CyD). In the prepared gel, the vinyl part of V-β-CyD consists a part of the copolymer chain, and the β-CyD part includes another copolymer chain, thus V-β-CyD works as a cross-linker. We call the procedure rotaxa-polymeric-gelation (RPG) because polymerization, rotaxane formation, and gelation proceed simultaneously. In this study, we applied acrylamide (AAm) instead of isoprene for RPG, and successfully obtained highly swellable hydrogel. By contrast, a combination of V-β-CyD and N-isopropylacrylamide (NIPAAm) was not suitable for RPG because NIPAAm and cavity of β-CyD were mismatched in size. In addition, we prepared three-component gels. Among of them, gels composed of NIPAAm, isoprene, and V-β-CyD showed thermo-responsiveness by reflecting the character of polyNIPAAm. These results provide an insight for usage of vinyl monomers for RPG strategy.
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