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    Effects of atmospheric plasma activation on surface properties of pigment-coated and surface-sized papers

    Year: 2008

    Journal: Applied Surface Science, Volume 255, Issue 5, Part 2, 30 December 2008, Pages 3217-3229, 20111221

    Authors: Maiju Pykönen, Henna Sundqvist, Joakim Järnström, Otto-Ville Kaukoniemi, Mikko Tuominen, Johanna Lahti, Jouko Peltonen, Pedro Fardim and Martti Toivakka

    Organizations: Laboratory of Paper Coating and Converting and Center for Functional Materials, Åbo Akademi University, Porthaninkatu 3, FI-20500 Turku, Finland, VTT Technical Research Centre of Finland, P.O. Box 1000, FI-02044 VTT, Finland, Department of Physical Chemistry and Center for Functional Materials, Åbo Akademi University, Porthaninkatu 3, FI-20500 Turku, Finland, Institute of Paper Converting, Tampere University of Technology, P.O. 541, FI-33101 Tampere, Finland, Laboratory of Fibre and Cellulose Technology, Åbo Akademi University, Porthaninkatu 3, FI-20500 Turku, Finland

    Pigment-coated, surface-sized, and surface-sized copy papers were treated with conventional corona, experimental pilot-scale plasma and laboratory-scale plasma. All the treatments increased the surface energy and oxidized the surface. The changes in the surface chemistry depended on treatment time and composition of the substrate surface. It seems that plasma especially oxidizes the long polymer chains, such as surfactants and other paper chemicals, on the surface of the paper. The ToF-SIMS distribution maps indicated that the pilot-scale treatment led to an uneven CO+ group distribution, whereas laboratory scale treatment gave a more even distribution of CO+ groups. In addition to chemical changes, topographical changes due to plasma treatment were detected. The RMS roughness increased for pigment-coated paper, whereas plasma treatment induced small nodules between the paper pigment particles with pigmented and surface-sized paper. The increase in roughness was also found to increase the wettability. This serves as a demonstration of roughness-induced increase of surface energy of the samples.