Journal
POLYMER CHEMISTRY
Volume 2, Issue 2, Pages 348-354Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0py00251h
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Funding
- European Community [MRTN-CT-2004-504052]
- Agence Nationale de la Recherche (ANR) [ANR-07-JCJC-0020-01]
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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. alpha-Methoxy-omega-azido-PEGs with M-w of 5, 20, and 50 kDa were then grafted to the alkyne functionalized SAMs via click chemistry in THF using Cu(PPh3)(3)Br/DIPEA as the catalytic system. The influence of polymer concentration in the grafting solution (Phi = 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.
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