Atmospheric Pressure Plasma Treatment of Wood and Wood-based Products - Treatment by Dielectric Barrier Discharge for Adhesion Improvement and Atmospheric Pressure Plasma Spraying for Coating Application. Sauerbier, P. Ph.D. Thesis, Univeristy of Goettingen, Göttingen, Germany, April, 2021. abstract bibtex In this work the application of atmospheric pressure plasma on wood and wood-based materials is investigated. It aims to improve the adhesion of coatings on wood-plastic composites (WPC) and deposit protective layers on wood and wood-based materials by plasma spraying. It is attempted to contribute to the increased use of sustainable resources through acquired fundamental knowledge and practically oriented experiments. Polypropylene (PP)-based WPCs were treated by dielectric barrier discharge (DBD) plasma with different working gases. Laser scanning microscopy showed that argon as a carrier gas made a significant contribution to the increase in surface roughness. Chemical analysis and calculation of the surface free energy from contact angle measurements were used to analyze the functionalization of the surface, showing, among other, that predominantly carbonyl groups are formed. The combination of increased roughness and functionalization significantly improved the adhesion of an acrylic dispersion coating. Nitrogen-containing groups (e.g., amines) could not be sustainably generated on the PP-WPC surfaces, which is most likely due to a rapid rearrangement of these intermediately generated groups towards carbonyls. The WPC relevant for 3D printing application with polylactide (PLA) as a polymer matrix was also treated with a DBD plasma. It was shown that the surface, despite already having functional groups, can be further significantly functionalized. Likewise, the roughness was increased, both of which in turn led to increased coating adhesion. The application for large-scale 3D printing in boat building was investigated in practical experiments together with other PP-, PLA-, and styrene maleic anhydride (SMA)-based WPCs. It was found that PLA-based WPC can be a promising material for this application. Compared to other surface treatment methods, plasma treatment was found to be the method that could achieve the best coating adhesion in standardized pull-off tests. A polyester based on iso- and terephthalic acid was deposited on beech (Fagus sylvatica), Grand fir (Abies grandis), and medium-density fiberboard by plasma spraying, demonstrating the feasibility of a solvent-free coating process independent of the conductivity of the substrate. In a second, consecutive step, it was possible to embed photocatalytically active bismuth (III) oxide into the polyester layer. The band gap, which must be present for photoactivity, remained present in the ultraviolet light range and was shifted by only 0.4 eV. The results obtained not only enable the coating with the tested materials, but also allow a variety of possible
@phdthesis{sauerbier_atmospheric_2021,
address = {Göttingen, Germany},
type = {Dissertation},
title = {Atmospheric {Pressure} {Plasma} {Treatment} of {Wood} and {Wood}-based {Products} - {Treatment} by {Dielectric} {Barrier} {Discharge} for {Adhesion} {Improvement} and {Atmospheric} {Pressure} {Plasma} {Spraying} for {Coating} {Application}},
abstract = {In this work the application of atmospheric pressure plasma on wood and wood-based materials is investigated. It aims to improve the adhesion of coatings on wood-plastic composites (WPC) and deposit protective layers on wood and wood-based materials by plasma spraying. It is attempted to contribute to the increased use of sustainable resources through acquired fundamental knowledge and practically oriented experiments. Polypropylene (PP)-based WPCs were treated by dielectric barrier discharge (DBD) plasma with different working gases. Laser scanning microscopy showed that argon as a carrier gas made a significant contribution to the increase in surface roughness. Chemical analysis and calculation of the surface free energy from contact angle measurements were used to analyze the functionalization of the surface, showing, among other, that predominantly carbonyl groups are formed. The combination of increased roughness and functionalization significantly improved the adhesion of an acrylic dispersion coating. Nitrogen-containing groups (e.g., amines) could not be sustainably generated on the PP-WPC surfaces, which is most likely due to a rapid rearrangement of these intermediately generated groups towards carbonyls. The WPC relevant for 3D printing application with polylactide (PLA) as a polymer matrix was also treated with a DBD plasma. It was shown that the surface, despite already having functional groups, can be further significantly functionalized. Likewise, the roughness was increased, both of which in turn led to increased coating adhesion. The application for large-scale 3D printing in boat building was investigated in practical experiments together with other PP-, PLA-, and styrene maleic anhydride (SMA)-based WPCs. It was found that PLA-based WPC can be a promising material for this application. Compared to other surface treatment methods, plasma treatment was found to be the method that could achieve the best coating adhesion in standardized pull-off tests. A polyester based on iso- and terephthalic acid was deposited on beech (Fagus sylvatica), Grand fir (Abies grandis), and medium-density fiberboard by plasma spraying, demonstrating the feasibility of a solvent-free coating process independent of the conductivity of the substrate. In a second, consecutive step, it was possible to embed photocatalytically active bismuth (III) oxide into the polyester layer. The band gap, which must be present for photoactivity, remained present in the ultraviolet light range and was shifted by only 0.4 eV. The results obtained not only enable the coating with the tested materials, but also allow a variety of possible},
language = {EN},
school = {Univeristy of Goettingen},
author = {Sauerbier, Philipp},
month = apr,
year = {2021},
file = {Dissertation_Sauerbier.pdf:C\:\\Users\\Eva\\Zotero\\storage\\LK7YXUQ4\\Dissertation_Sauerbier.pdf:application/pdf},
}
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It is attempted to contribute to the increased use of sustainable resources through acquired fundamental knowledge and practically oriented experiments. Polypropylene (PP)-based WPCs were treated by dielectric barrier discharge (DBD) plasma with different working gases. Laser scanning microscopy showed that argon as a carrier gas made a significant contribution to the increase in surface roughness. Chemical analysis and calculation of the surface free energy from contact angle measurements were used to analyze the functionalization of the surface, showing, among other, that predominantly carbonyl groups are formed. The combination of increased roughness and functionalization significantly improved the adhesion of an acrylic dispersion coating. Nitrogen-containing groups (e.g., amines) could not be sustainably generated on the PP-WPC surfaces, which is most likely due to a rapid rearrangement of these intermediately generated groups towards carbonyls. The WPC relevant for 3D printing application with polylactide (PLA) as a polymer matrix was also treated with a DBD plasma. It was shown that the surface, despite already having functional groups, can be further significantly functionalized. Likewise, the roughness was increased, both of which in turn led to increased coating adhesion. The application for large-scale 3D printing in boat building was investigated in practical experiments together with other PP-, PLA-, and styrene maleic anhydride (SMA)-based WPCs. It was found that PLA-based WPC can be a promising material for this application. Compared to other surface treatment methods, plasma treatment was found to be the method that could achieve the best coating adhesion in standardized pull-off tests. A polyester based on iso- and terephthalic acid was deposited on beech (Fagus sylvatica), Grand fir (Abies grandis), and medium-density fiberboard by plasma spraying, demonstrating the feasibility of a solvent-free coating process independent of the conductivity of the substrate. In a second, consecutive step, it was possible to embed photocatalytically active bismuth (III) oxide into the polyester layer. The band gap, which must be present for photoactivity, remained present in the ultraviolet light range and was shifted by only 0.4 eV. 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Nitrogen-containing groups (e.g., amines) could not be sustainably generated on the PP-WPC surfaces, which is most likely due to a rapid rearrangement of these intermediately generated groups towards carbonyls. The WPC relevant for 3D printing application with polylactide (PLA) as a polymer matrix was also treated with a DBD plasma. It was shown that the surface, despite already having functional groups, can be further significantly functionalized. Likewise, the roughness was increased, both of which in turn led to increased coating adhesion. The application for large-scale 3D printing in boat building was investigated in practical experiments together with other PP-, PLA-, and styrene maleic anhydride (SMA)-based WPCs. It was found that PLA-based WPC can be a promising material for this application. Compared to other surface treatment methods, plasma treatment was found to be the method that could achieve the best coating adhesion in standardized pull-off tests. A polyester based on iso- and terephthalic acid was deposited on beech (Fagus sylvatica), Grand fir (Abies grandis), and medium-density fiberboard by plasma spraying, demonstrating the feasibility of a solvent-free coating process independent of the conductivity of the substrate. In a second, consecutive step, it was possible to embed photocatalytically active bismuth (III) oxide into the polyester layer. The band gap, which must be present for photoactivity, remained present in the ultraviolet light range and was shifted by only 0.4 eV. 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