Title: Poly(N-isopropylacrylamide) Grafted on Plasma-Activated Poly(ethylene oxide): Thermal Response and Interaction With Proteins
Authors: BRETAGNOL FredericMANNELLI IlariaSIRGHI LucelVALSESIA AndreaCECCONE GiacomoGILLILAND DouglasLANDFESTER K.RAUSCHER HubertROSSI FrancoisHEINZ P.
Citation: LANGMUIR vol. 24 no. 12 p. 6166-6175
Publisher: AMER CHEMICAL SOC
Publication Year: 2008
JRC Publication N°: JRC46509
ISSN: 0743-7463
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC46509
DOI: 10.1021/la800575f
Type: Articles in Journals
Abstract: Thermoresponsive polymer layers offer the possibility of preparing smart surfaces with properties that are switchable through a phase transition, usually close to the lower critical solution temperature of the polymer. In particular, poly(N-isopropylacrylamide) (pNIPAM) has gained a great deal of attention because it has such a phase transition in a physiologically interesting temperature range. We have prepared ultrathin thermoresponsive coatings by grafting pNIPAM on a plasma-CVD-deposited, poly(ethylene oxide)-like polymer substrate that was activated in an Ar plasma discharge to initiate the grafting. The presence and integrity of pNIPAM was verified by XPS and ToF-SIMS, and a dramatic change in the wettability during the phase transition was identified by temperature-dependent contact angle measurements. The transition from the hydrated to the collapsed conformation was analyzed by temperature-dependent QCM measurements and by AFM. An unusual, reversible behavior of the viscoelastic properties was seen directly at the phase transition from the swollen to the collapsed state. The phase transition leads to a switching from protein repulsion to a state that allows the adsorption of proteins.
JRC Institute:Institute for Health and Consumer Protection

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