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Adsorption of poly(acrylic acid)-graft-poly(ethylene glycol) on polyelectrolyte multilayers

Progress in Colloid and Polymer Science, ISSN: 0340-255X, Vol: 138, Page: 95-102
2010
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Book Chapter Description

Graft copolymers PAA-g-PEG with poly(acrylic acid) (PAA, 200 kDa) backbone and poly(ethylene glycol) (PEG, 5 kDa) side chains with grafting ratios g = 5, adsorbed on stainless steel surfaces, were studied using FTIR-ATR spectroscopy. The amount of adsorbed PAA-g-PEG could strongly be increased with a polyelectrolyte multilayer (PEM) as an interlayer. Two independent calibration methods were used to calculate PEG chain areal densities σ or effective thickness values d = σ·n/p (n: number of EG units in the chain, p: assumed volume density of EG units) of the PEG component. With a suitable PEM interlayer a thickness of d = 34 nm, close to the theoretical length of a helical PEG chain with 114 EG units (32 nm), was obtained. In PEM-PEG coatings with appreciable contents of PEG, the dominance of vibrational bands with transition dipole moments parallel to the axis of helical PEG chains indicates that most PEG helices are oriented vertically on the substrate. © Springer-Verlag Berlin Heidelberg 2011.

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