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Influence of atmospheric pressure plasma treatments on the surface properties of ligno-cellulosic substrates

  • William P. Lekobou EMAIL logo , Karl R. Englund , Marie-Pierre Laborie and Patrick D. Pedrow
Published/Copyright: April 14, 2015
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Abstract

The paper aims at the investigation of atmospheric pressure weakly ionized plasmas with argon and acetylene to deposit plasma-polymerized coatings on wood veneers (birch, maple), cellulose paper, and pine wood flour to modify their surface properties, in particular their topography and wettability. The treatment was performed in a reactor containing an array of high-voltage needles and a grounded metallic mesh as electrodes. The deposition occurred in the discharge downstream of the plasma region. The plasma-polymerized acetylene deposits form spherical nodules on the surface of the substrates and change their wettability from hydrophilic to hydrophobic. The water contact angles of the veneer were determined with a goniometer. The capillary rise was combined with the Washburn equation to assess the change in hydrophilicity of the plasma-treated wood flour.


Corresponding author: William P. Lekobou, Composite Materials and Engineering Center and the Materials Science and Engineering Program at Washington State University, PO Box 641806 Washington State University, Pullman, WA 99164-1806, USA, Phone: +1 509 715 9989, e-mail:

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Received: 2014-7-20
Accepted: 2015-2-17
Published Online: 2015-4-14
Published in Print: 2016-1-1

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