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

Lazzara, Giuseppe LU ; Campbell, Richard A. LU ; Bayati, Solmaz LU ; Zhu, Kaizheng; Nyström, Bo; Nylander, Tommy LU and Schillén, Karin LU (2017) In Colloid and Polymer Science
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... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Cyclodextrin, Inclusion complex, Poly(N-isopropylacrylamide), Reflectometry, Solid/liquid interface, Thermoresponsive block copolymer
in
Colloid and Polymer Science
pages
15 pages
publisher
Springer
external identifiers
  • scopus:85015839094
  • wos:000406174700008
ISSN
0303-402X
DOI
10.1007/s00396-017-4052-6
language
English
LU publication?
yes
id
7f3bc828-bfdc-42c2-bda1-1fcef22a7b2c
date added to LUP
2017-04-05 09:58:11
date last changed
2017-09-18 13:31:26
@article{7f3bc828-bfdc-42c2-bda1-1fcef22a7b2c,
  abstract     = {<p>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.</p>},
  author       = {Lazzara, Giuseppe and Campbell, Richard A. and Bayati, Solmaz and Zhu, Kaizheng and Nyström, Bo and Nylander, Tommy and Schillén, Karin},
  issn         = {0303-402X},
  keyword      = {Cyclodextrin,Inclusion complex,Poly(N-isopropylacrylamide),Reflectometry,Solid/liquid interface,Thermoresponsive block copolymer},
  language     = {eng},
  month        = {03},
  pages        = {15},
  publisher    = {Springer},
  series       = {Colloid and Polymer Science},
  title        = {On the formation of inclusion complexes at the solid/liquid interface of anchored temperature-responsive PNIPAAM diblock copolymers with γ-cyclodextrin},
  url          = {http://dx.doi.org/10.1007/s00396-017-4052-6},
  year         = {2017},
}