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Issue 2, 2011
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Poly(ethylene glycol) brushes grafted to silicon substrates by click chemistry: influence of PEG chain length, concentration in the grafting solution and reaction time

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Abstract

The grafting of poly(ethylene glycol) (PEG) brushes to silicon substrates by the copper(I)-catalyzed Huisgen 1,3-dipolar cycloaddition, also coined as click chemistry, was studied in detail. First, the grafting kinetics of an alkyne-functionalized dimethylchlorosilane SAM from a toluene solution or in the vapor phase was monitored by water contact angle measurements. α-Methoxy-ω-azido-PEGs with Mw of 5, 20, and 50 kDa were then grafted to the alkyne functionalized SAMs via click chemistry in THF using Cu(PPh3)3Br/DIPEA as the catalytic system. The influence of polymer concentration in the grafting solution (Φ = 0.01–50 wt%) and reaction time (t = 0–72 h) on the thickness, morphology and wetting properties of the PEG brushes was investigated by ellipsometry, scanning probe microscopy and water contact angle measurements. PEG brushes up to 6 nm thick with homogeneous surface coverage and morphology as well as surface roughness on a nanometric scale were thus obtained using mild and robust grafting conditions.

Graphical abstract: Poly(ethylene glycol) brushes grafted to silicon substrates by click chemistry: influence of PEG chain length, concentration in the grafting solution and reaction time

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Publication details

The article was received on 05 Aug 2010, accepted on 03 Sep 2010 and first published on 21 Sep 2010


Article type: Paper
DOI: 10.1039/C0PY00251H
Polym. Chem., 2011,2, 348-354

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    Poly(ethylene glycol) brushes grafted to silicon substrates by click chemistry: influence of PEG chain length, concentration in the grafting solution and reaction time

    R. Ostaci, D. Damiron, S. Al Akhrass, Y. Grohens and E. Drockenmuller, Polym. Chem., 2011, 2, 348
    DOI: 10.1039/C0PY00251H

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