Abstract
In this study, three different dielectric barrier discharges, based on the same setup and run with the same power supply, are characterized by emission spectroscopy with regards to the reduced electrical field strength, and the rotational, vibrational and electron temperature. To compare discharges common for the treatment on wood, a coplanar surface barrier discharge, a direct dielectric barrier discharge and a jet system/remote plasma are chosen. To minimize influences due to the setups or power, the discharges are realized with the same electrodes and power supply and normalized to the same power. To evaluate the efficiency of the different discharges and the influence on treated materials, the surface free energy is determined on a maple wood, high density fiberboard and wood plastic composite. The influence is measured depending on the treatment time, with the highest impact in the time of 5 s.
Highlights
To evaluate the efficiency of the different discharges and the influence on treated materials, the surface free energy is determined on a maple wood, high density fiberboard and wood plastic composite
For several application fields and materials, plasma treatment is used for surface activation in order to enhance adhesion properties
The impact of plasma treatment and the physical parameters resulting from the interaction between the plasma discharge and the substrate were analyzed based on three different types of wood and wood-based materials: solid wood of maple (Acer spec.), wood-polymer composites (WPC) and high density fiberboard (HDF)
Summary
For several application fields and materials, plasma treatment is used for surface activation in order to enhance adhesion properties. For the treatment of polymers, extensive research has been done in the past [1,2,3,4]. Natural materials such as wood and wood-based materials, have become increasingly relevant in this field. Wood is the most common building material and combines several advantages, such as comparatively low cost, renewable and sustainable production, carbon capture and storage potential, as well as a balanced relation of weight and mechanical strength [5]. The plasma treatment of wood and wooden materials is still in its beginning stages the first patents have existed for more than 15 years [6]. Surfaces are treated or coated by low pressure plasma discharges.
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