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Quartz crystal microbalance with coupled Spectroscopic Ellipsometry-study of temperature-responsive polymer brush systems
Leibniz Institute Polymerforsch eV, Germany; Technical University of Dresden, Germany.
Leibniz Institute Polymerforsch eV, Germany; Technical University of Dresden, Germany; Karlsruhe Institute Technology, Germany.
University of Nebraska, NE 68588 USA; Biolin Science Inc, NJ 07652 USA.
Leibniz Institute Polymerforsch eV, Germany.
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2017 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 421, 843-851 p.Article in journal (Refereed) Published
Abstract [en]

Using a combined setup of quartz crystal microbalance with dissipation monitoring together with spectroscopic ellipsometry, the thermo-responsive behavior of two different brush systems (poly(N-isopropyl acrylamide) and poly(2-oxazoline)s) was investigated and compared to the behavior of the free polymer in solution. Poly(2-oxazoline)s with three different hydrophilicities were prepared by changing the content of a hydrophilic comonomer. While both polymer types exhibit a sharp, discontinuous thermal transition in solution, in the brush state the transition gets broader in the case of poly(N-isopropyl acrylamide) and is transformed into a continuous transition for poly(2-oxazoline)s. The position of the transition in solution is influenced by the degree of hydrophilicity of the poly(2-oxazoline). The difference in areal mass detected by quartz crystal microbalance and by spectroscopic ellipsometry, has been attributed to the chain segment density profile of the polymer brushes. Applying this density profile information, for poly(N-isopropyl acrylamide) two different swelling stages could be identified, while for poly(2-oxazoline) the transition between a parabolic and more step-wise profile is found continuous. The different swelling characteristics were attributed to the different miscibility behavior types, with the brush state acting similar to a crosslinked system. (C) 2017 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2017. Vol. 421, 843-851 p.
Keyword [en]
Quartz crystal microbalance; Spectroscopic ellipsometry; Temperature-sensitive polymer brushes; Poly(2-oxazoline); Poly(N-isopropyl acrylamide)
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-141113DOI: 10.1016/j.apsusc.2017.02.078ISI: 000408756700091OAI: oai:DiVA.org:liu-141113DiVA: diva2:1144782
Note

Funding Agencies|German Science Foundation (DFG) within the DFG-NSF cooperation project [STA 324/49-1, EI 317/6-1, SPP 1369, STA 324/37-1]; National Science Foundation (NSF) through the Center for Nanohybrid Functional Materials [EPS-1004094]

Available from: 2017-09-27 Created: 2017-09-27 Last updated: 2017-09-27

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