On the formation of inclusion complexes at the solid/liquid interface of anchored temperature-responsive PNIPAAM diblock copolymers with γ-cyclodextrin

Giuseppe Lazzara, Richard A. Campbell, Solmaz Bayati, Kaizheng Zhu, Bo Nyström, Tommy Nylander, Karin Schillén

Research output: Contribution to journalArticlepeer-review

4 Citations (SciVal)

Abstract

The thermal responsive behavior of adsorbed layers of diblock copolymers of poly(N-isopropylacrylamide) (PNIPAAM) and poly((3-acrylamidopropyl)trimethylammonium chloride) (PAMPTMA(+)) with γ-cyclodextrin (γ-CD) at the solid/liquid interface has been investigated using three in situ techniques: null ellipsometry, quartz–crystal microbalance with dissipation monitoring, and neutron reflectometry. The measurements provided information about the adsorbed amounts, the layer thickness, hydration and viscoelastic properties, and the interfacial structure and composition. The copolymers adsorb to silica with the cationic PAMPTMA(+) blocks sitting as anchors in a flat conformation and the PNIPAAM chains extending into the solution. The copolymer system alone exhibits reversible collapse above the lower critical solution temperature of PNIPAAM. The addition of γ-CD to pre-adsorbed copolymer layers results in a highly extended conformation as well as some loss of copolymer from the surface, which we discuss in terms of the formation of surface-invoked lateral steric repulsion of formed inclusion complexes.

Original languageEnglish
Pages (from-to)1327-1341
JournalColloid and Polymer Science
Volume295
Issue number8
Early online date2017 Mar 22
DOIs
Publication statusPublished - 2017 Aug

Subject classification (UKÄ)

  • Polymer Chemistry

Keywords

  • Cyclodextrin
  • Inclusion complex
  • Poly(N-isopropylacrylamide)
  • Reflectometry
  • Solid/liquid interface
  • Thermoresponsive block copolymer

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