Photo-attaching functional polymers to cellulose fibers for the design of chemically modified paper |
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Authors: | Alexander Böhm Melanie Gattermayer Christian Trieb Samuel Schabel Dirk Fiedler Frank Miletzky Markus Biesalski |
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Institution: | 1. Department of Chemistry, Macromolecular Chemistry and Paper Chemistry, and Center of Smart Interfaces (CSI), Technische Universit?t Darmstadt, Petersenstra?e 22, 64287, Darmstadt, Germany 2. Department of Mechanical Engineering, Paper Technology, Technische Universit?t Darmstadt, Alexanderstra?e 8, 64283, Darmstadt, Germany 3. Department of Functionalized Surfaces, Surface Finishing, Papiertechnische Stiftung (PTS), Pirnaer Strasse 37, 01809, Heidenau, Germany
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Abstract: | We introduce a novel approach for preparing polymer-modified and chemically microstructured paper substrates by a photo-chemical attachment of functional polymers to cellulose microfibers inside model filter papers. Poly(methyl methacrylate), PMMA copolymers, which carry a defined amount of photo-reactive benzophenone functional groups, are adsorbed to paper substrates from solution by a simple dip coating process, followed by covalent attachment of the physisorbed polymers through UV-light irradiation. Non-bound macromolecules can be removed from paper sheets by simple solvent extraction, and the resulting polymer-modified substrates were analysed with respect to chemical identity, attached polymer mass, and homogeneity of the polymer attachment. The amount of paper-attached polymers can be conveniently controlled in a wide range from a few mg/g cellulose fiber up to several tenth of mg/g cellulose fiber, by adjusting the polymer concentration in the coating solution. Polymers are being attached by photo-chemical means, and chemical micro patterns on paper can be designed by lithographical means. In first proof-of-concept studies, millimeter-scale channels were prepared that can be used to control fluid penetration by capillary actions. Because of the modularity in the design of photo-reactive polymers, a number of different chemically microstructured papers can be envisioned which may become potentially interesting in lab-on-paper devices. |
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