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Polyrotaxane Brushes Dynamically Formed at a Water/Elastomer Interface
- Yanagi, Kanta, Yamada, Norifumi L., Kato, Kazuaki, Ito, Kohzo, Yokoyama, Hideaki
- Langmuir 2018 v.34 no.18 pp. 5297-5302
- X-ray photoelectron spectroscopy, gamma-cyclodextrin, hydrophilicity, hydrophobicity, polymers, proteins, reflectometry
- Dense polymer brushes with closely packed rotaxane structures were formed at the interface of water and a styrene-butadiene elastomer by spontaneous segregation of an amphiphilic polyrotaxane (PR), a mechanically interlocked polymer consisting of hydrophobic polybutadiene threading through multiple hydrophilic γ-cyclodextrin (γ-CD) derivatives. Segregation of PR at the water/elastomer interface was suggested by X-ray photoelectron spectroscopy. The polymer brush structure at the water interface was investigated using neutron reflectometry. Brush structures were found to depend on the number of CDs on the PRs; the PR with a small number of CDs formed a thinner and homogeneous brush, whereas the PR with a higher number of CDs formed a thicker and less-ordered brush. These PR-brushes showed protein repulsion, resulting from the surface-hydrated brush layer preventing direct contact of proteins.