Contact
    Start Publications Enhanced Surface Wetting of Pigment Coated Paper by UVC ...
    ←  Publication Finder
    Attension

    Enhanced Surface Wetting of Pigment Coated Paper by UVC Irradiation

    Year: 2010

    Journal: Industrial & engineering chemistry research, 2010, 49 (22), pp 11351–11356, 20111221

    Authors: Anni Määttänen, Petri Ihalainen, Roger Bollström, Shaoxia Wang, Martti Toivakka, and Jouko Peltonen

    Organizations: Centre of Excellence for Functional Materials, Laboratory of Paper Coating and Converting, Åbo Akademi University, Porthaninkatu 3-5, FI-20500 Turku, Finland

    The effect of UVC (λmax = 254 nm) treatment on wettability of pigment-coated papers was examined. The paper samples were coated with conventional pigments including ground calcium carbonate (GCC), precipitated calcium carbonate aragonite (PCC), and Kaolin. The coating formulation also included poly(styrene-butadiene) (SB) latex binder and a dispersing agent, sodium polyacrylate (NaPA), for formation of a colloidally stable pigment slurry at a relatively high solids content. A significant decrease of contact angle of water on the studied pigment-coated papers was observed as a result of UVC treatment. The effect was most pronounced for carbonate-based coatings. In addition, the UVC treatment showed long-term stability. A detailed analysis of the surface chemical composition of the PCC-based coatings indicated that the UVC treatment leads to photooxidation and photodegradation, and eventual desorption of a thin NaPA overlayer from the pigment surface. This in turn increases the polarity of the surface and enhances its wettability.