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Article Dans Une Revue Polymer Chemistry Année : 2011

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

Résumé

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.
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Dates et versions

hal-00594682 , version 1 (20-05-2011)

Identifiants

  • HAL Id : hal-00594682 , version 1

Citer

Roxana-Viorela Ostaci, Denis Damiron, Samer Al Akhrass, Yves Grohens, Eric Drockenmuller. Poly(ethylene glycol) brushes grafted to silicon substrates by click chemistry: Influence of PEG chain length, concentration in the grafting solution and reaction time. Polymer Chemistry, 2011, pp.348-354. ⟨hal-00594682⟩
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