Plasma Pre-treatments to Improve the Weather Resistance of Polyurethane Coatings on Black Spruce Wood
department or school: Forestry, Faculty of
department or school: Non UBC
data provider: DSpace
identifier citation: Coatings 9 (1): 8 (2018)
creator: Haase, Jonathan G.
creator: Leung, Lukie H.
creator: Evans, P. D. (Philip D.)
issued: 2019-06-06T17:06:12Z
issued: 2018-12-25
description: We hypothesize that plasma treatments that increase the adhesion and penetration of transparent water, and solvent-borne polyurethane coatings into black spruce wood will improve the performance of coated wood exposed to accelerated weathering. We tested this hypothesis by modifying wood samples with plasma for 30, 180, 600, and 1200 s, and measuring coating penetration and adhesion using light microscopy and a mechanical pull-off test, respectively. Plasma treatment did not improve coating adhesion, but the solvent-borne coating showed deeper penetration into plasma-modified wood, and its resistance to accelerated weathering was better on plasma-modified wood than on untreated controls. Plasma treatments enhanced the penetration of water-borne polyurethane into wood, but the treatments did not improve weather-resistance of the coating. Plasma treatment increased the wettability of wood surfaces, and prolonged plasma treatment etched cell walls, increasing their porosity. These effects may explain the positive effect of plasma treatment on coating penetration, and the increased weather-resistance of the solvent-borne polyurethane on plasma-modified wood. In conclusion, our results indicate that the ability of plasma treatment to improve coating performance on black spruce depends on the coating type, and the effects of the treatment on the surface microstructure of wood.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/70553
note: coatingsArticlePlasma Pre-treatments to Improve the WeatherResistance of Polyurethane Coatings on BlackSpruce WoodJonathan G. Haase 1, Lukie H. Leung 1 and Philip D. Evans 1,2,*1 Faculty of Forestry, University of British Columbia, Vancouver, BC V6T 1Z4, Canada;jo_haase@yahoo.com (J.G.H.); mrlukieleung@gmail.com (L.H.L.)2 Department of Applied Mathematics, Australian National University Canberra,Canberra ACT 0200, Australia* Correspondence: phil.evans@ubc.ca; Tel.: +1-604-822-0517; Fax: +1-604-822-9159Received: 6 November 2018; Accepted: 20 December 2018; Published: 25 December 2018 Abstract: We hypothesize that plasma treatments that increase the adhesion and penetration oftransparent water, and solvent-borne polyurethane coatings into black spruce wood will improvethe performance of coated wood exposed to accelerated weathering. We tested this hypothesis bymodifying wood samples with plasma for 30, 180, 600, and 1200 s, and measuring coating penetrationand adhesion using light microscopy and a mechanical pull-off test, respectively. Plasma treatmentdid not improve coating adhesion, but the solvent-borne coating showed deeper penetration intoplasma-modified wood, and its resistance to accelerated weathering was better on plasma-modifiedwood than on untreated controls. Plasma treatments enhanced the penetration of water-bornepolyurethane into wood, but the treatments did not improve weather-resistance of the coating.Plasma treatment increased the wettability of wood surfaces, and prolonged plasma treatment etchedcell walls, increasing their porosity. These effects may explain the positive effect of plasma treatmenton coating penetration, and the increased weather-resistance of the solvent-borne polyurethane onplasma-modified wood. In conclusion, our results indicate that the ability of plasma treatment toimprove coating performance on black spruce depends on the coating type, and the effects of thetreatment on the surface microstructure of wood.Keywords: wood; clear…
has type: Article
is shown at: 10.14288/1.0379336
language: eng
peer review status: Reviewed
provider: Vancouver : University of British Columbia Library
publisher: Multidisciplinary Digital Publishing Institute
publisher DOI: 10.3390/coatings9010008
rights: CC BY 4.0
rights URI: https://creativecommons.org/licenses/by/4.0/
scholar level: Faculty
subject: Wood
subject: Clear polyurethane coatings
subject: Plasma
subject: Penetration
subject: Adhesion
subject: Accelerated weathering
subject: Defects
subject: Black spruce
type: Text
identifier URI: http://hdl.handle.net/2429/70553