1. On the formation of inclusion complexes at the solid/liquid interface of anchored temperature-responsive PNIPAAM diblock copolymers with γ-cyclodextrin
- Author
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Karin Schillén, Giuseppe Lazzara, Kaizheng Zhu, Bo Nyström, Tommy Nylander, Richard A. Campbell, Solmaz Bayati, Lazzara, G., Campbell, R.A., Bayati, S., Zhu, K., Nyström, B., Nylander, T., and Schillén, K.
- Subjects
Amide ,Polymers and Plastics ,Block copolymer ,Reflectometer ,Reflection ,02 engineering and technology ,01 natural sciences ,supramolecular chemistry ,quartz crystal microbalance ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,Ellipsometry ,Viscoelasticity, Inclusion complex ,Copolymer ,Materials Chemistry ,Poly (n isopropylacrylamide) ,Poly(N-isopropylacrylamide) ,Settore CHIM/02 - Chimica Fisica ,chemistry.chemical_classification ,Reflectometry ,Cyclodextrin ,unclassified drug, Article ,021001 nanoscience & nanotechnology ,Thermoresponsive block copolymer ,priority journal ,solid ,polymerization ,synthesi ,Neutron reflectometry ,polyrotaxane ,0210 nano-technology ,ellipsometry ,Materials science ,poly(n isopropylacrylamide) ,010402 general chemistry ,Lower critical solution temperature ,Acrylic monomer ,atom transfer radical polymerization ,Adsorption ,complex formation ,Polymer chemistry ,liquid ,Physical and Theoretical Chemistry ,Solid/liquid interface ,Thermo-responsive, Hydrogels, copolymer ,neutron reflectometry ,Inclusion complex ,gamma cyclodextrin ,Cationic polymerization ,0104 chemical sciences ,solid liquid interface ,chemistry ,Chemical engineering ,Invited Article - 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. © 2017, The Author(s).
- Published
- 2017
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