|
Authors
|
Rauch, S. ; Eichhorn, K.-J. ; Oertel, U. ; Stamm, M. ; Kuckling, D. ; Uhlmann, P.
|
|
Title
|
Temperature responsive polymer brushes with clicked rhodamine B: synthesis, characterization and swelling dynamics studied by spectroscopic ellipsometry
|
|
Date
|
04.09.2012
|
|
Number
|
34442
|
|
Abstract
|
Here, we report on a new temperature responsive polymer brush system with a terminal click functionality. Bifunctionalized poly(N-isopropylacrylamide) (PNiPAAm) with distinct functional end groups was synthesized by atom transfer radical polymerization (ATRP) and grafted to a modified silicon substrate. The presence of the active terminal alkyne functionality is validated using an azide-modified rhodamine B (N3-RhB) via copper(I) catalyzed alkyneazide cycloaddition (CuAAC). The optical properties and swelling dynamics of an N3-RhB modified PNiPAAm brush are analyzed in dry state and in situ by VIS-spectroscopic ellipsometry (SE). The best-fit results are obtained using a Gaussian oscillator model and are confirmed by UV/VIS-spectroscopy. We observed evidence of interactions between the aromatic residues of the dye and the PNiPAAm amide groups, which significantly affect the swelling behavior of the modified polymer brush.
|
|
Publisher
|
Soft Matter
|
|
Wikidata
|
|
|
Citation
|
Soft Matter 8 (2012) 10260-10270
|
|
DOI
|
https://doi.org/10.1039/C2SM26571K
|
|
Tags
|
transfer radical polymerization low-molecular-weight n-isopropylacrylamide grafting density poly(n-isopropylacrylamide) brushes protein adsorption chain collapse polyelectrolyte brushes conformational-change chemistry approach
|
