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Tuning the resistance of polycarbonate membranes by plasma-induced graft surface modification

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2013
Author Baumann L., Hegemann D., de Courten D., Wolf M., Rossi R. M., Meier W. P., Scherer L. J.,
Project Nanostructured Polymers
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Original article (peer-reviewed)

Journal Applied Surface Science
Volume (Issue) 268
Page(s) 450 - 457
Title of proceedings Applied Surface Science

Abstract

To tune the permeability resistance of porous polycarbonate (PC) membranes for caffeine, their surfaces were plasma modified with different monomers in a grafting from process. These coatings provided characteristic surface hydrophilicities. It was found that membranes with more hydrophilic surfaces have lower resistances to let caffeine pass through than membranes with hydrophobic surfaces. Additionally, it was possible to post-modify a poly(2-aminoethyl methacrylate) (AEMA) coated PC membrane with octanoic acid (Oct) under mild conditions. This post modification allowed transforming a slightly hydrophilic PC-AEMA membrane with a moderate permeability resistance into a hydrophobic PC-AEMA-Oct membrane with a high permeability resistance. Overall, it was possible to tune the PC membrane resistance for caffeine in a range from 5100 up to 15,100 s/cm. (C) 2013 Elsevier B.V. All rights reserved.
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