Role of substrate outgassing on the formation dynamics of either hydrophilic or hydrophobic wood surfaces in atmospheric-pressure, organosilicon plasmas

Abstract

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The functional features and interface design of wood/polypropylene composites based on microencapsulated wood particles via adopting in situ emulsion polymerization

“…Furthermore, water resistance is an important parameter in WPCs, carbon nano‐tubes and functional couplings have been used successfully to construct hydrophobic interface in polymer composites . To microencapsulation, absorptive features of wood–polypropylene‐composites are summarized in Fig.…”

Creation of superhydrophobic wood surfaces by plasma etching and thin-film deposition

“…Hexamethyldisiloxane (HMDSO) has also been shown to be a viable film precursor to create hydrophobicity on various wood surfaces [2,9,17,[20][21][22]. Fluorine-containing monomers such as CF 4 [23], and SF 6 [9] have been reported to modify the hydrophobicity of spruce, chestnut poplar, and pine wood surfaces.…”

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

“…8,[22][23][24][25][26] On the other hand, in the last two decades there has been growing interest in thin lm deposition via atmospheric pressure cold plasma technologies; 27 however, unlike other natural and synthetic materials, this eld of study has not been fully explored for wood and wood-based materials, especially using uorine precursors. The few studies published in the literature focused on functionalization with hexamethyldisiloxane (HMDSO), [28][29][30] ZnO-SiO 2 coatings 31 and other precursors, such as ethane, methane, ethylene, chlorotriuoroethylene and hexauoropropylene. 32,33 At the same time, the importance of atmospheric pressure plasma technology is highlighted by the fact that is an interesting alternative for use in the wood industry due to both the generation of cold plasma, which means plasma discharge generated at room temperature, in open systems 34 and the easy implementation in a continuous production line.…”

“…In the case of dielectric barrier discharges (DBD), Levasseur et al 28 conrmed that the treatment of wood and textiles is a challenge compared to other conventional materials since the plasma deposition dynamics not only depends on the chemical structure of these polymers but also on their porous microstructure and the presence of impurities on their surface. As a matter of fact, wood surface treatment by inert or reactive gases is controversial since both hydrophobic and hydrophilic characteristics have been reported using the same precursor.…”

“…For example, as expected, previous studies observed the hydrophilization of the wood surface by oxygen (O 2 ) treatment, in some cases followed by an increase in roughness. [37][38][39] On the other hand, Prégent et al 36 reported recently the hydrophobization of a wood surface treated by N 2 /O 2 plasma in an aerglow system at atmospheric pressure due to the increase of neutral gas at a temperature of 75 C, which led to similar conditions to wood heat treatment at temperatures lower than 150 C. Levasseur et al 28 observed the time dependence of DBD treatment because short periods led to the deposition of an SiO x hydrophilic layer, whereas longer times (>10 min) resulted in a hydrophobic layer containing Si(CH 3 ) 3 -O-Si(CH 3 ) 2 , Si(CH 3 ) 3 , and Si(CH 3 ) 2 functional groups.…”