Hydrogel Characteristics of Electron-Beam-Immobilized Poly(vinylpyrrolidone) Films on Poly(ethylene terephthalate) Supports

Abstract

A novel strategy for the preparation of thin hydrogel coatings on top of polymer bulk materials was elaborated for the example of poly(ethylene terephthalate) (PET) surfaces layered with poly(vinylpyrrolidone) (PVP). PVP layers were deposited on PET foils or SiO2 surfaces (silicon wafer or glass coverslips) precoated with PET and subsequently cross-linked by electron beam treatment. The obtained films were characterized by ellipsometry, X-ray photoelectron spectroscopy, infrared spectroscopy in attenuated total reflection, atomic force microscopy (AFM), and electrokinetic measurements. Ellipsometric experiments and AFM force-distance measurements showed that the cross-linked layers swell in aqueous solutions by a factor of about 7. Electrokinetic experiments indicated a strong hydrodynamic shielding of the charge of the underlying PET layer by the hydrogel coatings and further proved that the swollen films were stable against shear stress and variation of pH. In conclusion, electron beam cross-linking ofpreadsorbed hydrophilic polymers permits a durable fixation of swellable polymer networks on polymer supports which can be adapted to materials in a wide variety of shapes.

Hydroxide and hydronium ion adsorption — A survey

“…Based on this finding, the temperature dependence of the streaming current vs. pressure gradient can be attributed to different hydrodynamic accessibilities of the counterions in the diffuse layer at 4°C and 22°C [58,59]. Similar effects were previously reported for poly(ethylene oxide) brushes immobilized onto polystyrene films [60] and polyvinylpyrrolidon hydrogels chemically grafted onto polyethylene terephthalate films [61].…”

Cytocompatibility of poly(acrylonitrile-co-N-vinyl-2-pyrrolidone) membranes with human endothelial cells and macrophages

“…1 that the introduction of NVP caused a large decrease in water contact angle with time on the membrane surface, which was mainly due to water absorption into the membrane. In fact, PVP is a kind of versatile hydrogel material with a proven capability for water absorption [9,10,12].…”

“…Furthermore, cells could not adhere well to either hydrophilic and hydrophobic material surfaces at the initial stage. However, Meinhold et al [9] pointed out that modifications with water-soluble polymers such as PVP and poly(ethylene glycol) (PEG) could strongly attenuate the adsorption of proteins and the adhesion of cells. Furthermore, as shown in this paper, PAN, a moderately hydrophilic polymer (the water contact angle for PAN is about 65°, Fig.…”

“…Poly(N-vinyl-2-pyrrolidone) (PVP), a known watersoluble and biocompatible polymer, has been widely used as a blood plasma substitute, additive and surface modifier [1][2][3][4][5][6][7][8][9][10][11][12]. In particular, PVP ensures excellent hemocompatibility for many kinds of dialysis membranes, e.g.…”

Direkte UV‐induzierte Funktionalisierung oberflächengebundener Hydroxygruppen mithilfe von Thiol‐Alkohol‐Chemie

“…Um gewünschte Oberflächeneigenschaften zu erhalten, werden verschiedene Oberflächenmodifizierungsverfahren, wie Gasphasenabscheidung, [2] Elektronenstrahl-Polymerisation, [3] Plasmabehandlung [4] und Photopfropfen [5] verwendet. Unlängst wurde eine Reihe von lichtinduzierten Verfahren zur Oberflächen-funktionalisierung, basierend auf Thiol-Alkin-AlkenChemie, [6] der Diels-Alder-Reaktion, [7] der Tetrazol-AlkenReaktion, [8] Alkin-Azid-Chemie, [9] Oxim-Kupplung, [10] Hydrosilylierung [11] oder der photolytischen Zersetzung von Perfluorarylaziden, [12] entwickelt.…”