NDLI: Novel evaluation method of neutron reflectivity data applied to stimulus-responsive polymer brushes

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Jianming Linse, Per Nylander, Tommy Zauscher, Stefan Campbell, Richard A. Rennie, Adrian R.
Copyright Year	2008
Abstract	Neutron reflectivity (NR) measurements have been performed on stimulus-responsive polymer brushes containing N-isopropylacrylamide (NIPAAM) at different temperatures and contrasts using two different brush samples of roughly the same grafting density and layer thickness. The NR data were analyzed using a novel method employing polymer density profiles predicted from lattice mean-field theory augmented with a polymer model to describe polymer solubility that decreases with increasing temperature. The predicted density profiles at the different temperatures were self-consistent with the experimentally observed profiles; hence the experimental data lend credibility to the theory. We found that the brush thickness decreased from 220 to 160 nm and the polymer volume fraction increased from 55 to 75% when increasing temperature from 293 to 328 K. The new evaluation approach involved significantly fewer independent fitting parameters than methods involving layers of uniform densities. Furthermore, the approach can straightforwardly be extended to analyze neutron reflectivity data of grafted, weakly charged polymers that display pH-sensitive behaviour and also to block copolymers and to surfaces with adsorbed polymers. We propose that such accurate model calculations provide a tool to interpret results from NR experiments more effectively and design neutron reflectivity experiments for optimal outcome.
Starting Page	500
Ending Page	509
Page Count	10
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	4
Issue Number	3
Journal	Soft Matter
DOI	10.1039/b714911e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Polymer Mean field theory Grafting Crystal structure
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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