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Probing the thermal collapse of PNIPAM grafts by quantitative in situ ellipsometry

Published online by Cambridge University Press:  07 October 2013

E.S. Kooij ,
X.F. Sui ,
M.A. Hempenius ,
H.J.W. Zandvliet  and
G.J. Vancso
E.S. Kooij
Affiliation:
Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands
X.F. Sui
Affiliation:
Materials Science and Technology of Polymers, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands
M.A. Hempenius
Affiliation:
Materials Science and Technology of Polymers, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands
H.J.W. Zandvliet
Affiliation:
Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands
G.J. Vancso
Affiliation:
Materials Science and Technology of Polymers, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands
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Abstract

We demonstrate the potential of spectroscopic ellipsometry for the investigation of the chain segment density profile and layer thickness during the temperature-induced, reversible collapse−expansion transition of poly(N-isopropylacrylamide) (PNIPAM) grafted layers with variable grafting densities in aqueous systems. To obtain a quantitative description of the thickness of our swollen PNIPAM layers, various models were implemented to fit the ellipsometric data. From the ellipsometry results, the density and thickness variation accompanying the collapse transition across the lower critical solution temperature (LCST) was characterized. The collapse can be adequately explained by considering the PNIPAM film to consist of two layers: (i) a dense layer near the surface and (ii) a more diluted layer with a gradient density profile on the side of the film exposed to the solvent.

Keywords

polymeroptical propertiesstructural
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1544: Symposium J – In-Situ Characterization Methods in Energy Materials Research , 2013 , mrss13-1544-j09-17
Copyright
Copyright © Materials Research Society 2013 

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