Changes of wettability of medium density fiberboard (MDF) treated with He-DBD plasma

Abstract

The effects of two power levels (50 and 150 W) and five time levels (10, 20, 40, 60 and 120 s) of glow discharge in helium dielectric barrier discharge (He-DBD) has been investigated in the context of surface modification of medium density fiberboard (MDF) panels. He-DBD elevated the surface wettability of MDF panels as assessed by dynamic contact angle (CA) measurements including the determination of surface free energy, droplet volume and spreading contact area of droplets. The chemical changes of the MDF surfaces were also characterized by X-ray photoelectron spectroscopy (XPS). Expectedly, the apparent CA and droplet volume decreased with increasing power and time of glow discharge, mainly at the 150 W power level. The oxygen content of the surfaces, the surface free energy and the spreading contact area increased upon treatment. At higher energy levels the treatment time could be reduced, which is essential for future applications in industrial processes.

Dielectric and surface properties of wood modified with NaCl aqueous solutions and treated with FE-DBD atmospheric plasma

“…The appearance (i.e. distribution of charges on the electrodes, streamers distribution or discharge self-organization) and other properties of the plasma are highly dependent on the properties and conditions in the plasma reactor (Conrads and Schmidt 2000;Rehn and Viöl 2003), as well as on the wooden substrate's dielectric properties (Levasseur et al 2014;De Cademartori et al 2015).…”

Thermosetting composites prepared using husk of pine nuts from Araucaria angustifolia

“…Increasing polymer content decreases the roughness (high compaction and fewer flaws) and consequently decreases the wettability . High pressure and high temperature during flat‐pressing (including fiberboard and particleboard) results in small surface free energy and subsequent low wettability (low spreading contact area) .…”

Enhancing the water repellency of wood surfaces by atmospheric pressure cold plasma deposition of fluorocarbon film

“…9 These major effects drive the application of plasma treatments for different goals, such as antifouling properties, 10 biocompatibility, 11 superhydrophobicity, 12 improving surface adhesion, 13,14 oxygen barrier properties 15 and antibacterial properties. 16 The application of plasma in wood and wood-based materials involves two main goals, the improvement of surface adhesion [17][18][19][20][21] and the deposition of low surface energy thin lms to increase the barrier properties against polar and non-polar liquids and gases. The deposition of low surface energy lms on the wood surface is relatively well understood in low-pressure plasma reactors from the many reports published, which mainly use siloxanes, uorine and alkanes as precursors.…”