Preventive action of organosilicon treatments against disfigurement of wood under laboratory and outdoor conditions |
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| Authors: | Liesbeth De Vetter Jan Van den Bulcke Imke De Windt Marc Stevens Joris Van Acker |
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| Affiliation: | 1. Ghent University, Department of Forest and Water Management, Faculty of Bioscience Engineering, Coupure Links 653, 9000 Ghent, Belgium;2. UGCT, University Ghent Centre for X-ray Tomography, Proeftuinstraat 86, 9000 Ghent, Belgium;3. Ghent University, Department of Physics and Astronomy, Institute for Nuclear Sciences, Proeftuinstraat 86, 9000 Ghent, Belgium;1. Dipartimento di Scienze della Terra e del Mare (DiSTeM), Università degli Studi di Palermo, Via Archirafi 22, 90123 Palermo, Italy;2. Institució Catalana de Recerca i Estudis Avançats (ICREA), Universitat de Barcelona, Barcelona, Spain;3. Dipartimento di Scienze e Tecnologie Biologiche, Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, Viale delle Scienze, 90128 Palermo, Italy;4. Dipartimento di Architettura, Università degli Studi di Palermo, Viale delle Scienze, 90128 Palermo, Italy;1. Department of Food and Nutrition, Kunsan National University, Gunsan, Jeonbuk 573-701, South Korea;2. Quality Improvement Team, Korea Health Industry Development Institute, Cheongwon, Chungbuk 363-700, South Korea;3. Department of Microbiology, Ministry of Food and Drug Safety, Cheongwon, Chungbuk 363-700, South Korea;4. Department of Statistics, Dongguk Unversity-Seoul, Seoul 100-715, South Korea;1. UGCT–Woodlab-UGent, Laboratory of Wood Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Gent, Belgium;2. UGCT, Department of Physics and Astronomy, University Ghent Centre for X-ray Tomography, Proeftuinstraat 86, 9000, Ghent, Belgium;3. Department of Mechanics of Materials and Constructions, Vrije Universiteit Brussel, Pleinlaas 2, Brussels, Belgium;1. Ghent University, Department of Forest and Water Management, Faculty of Bioscience Engineering, Coupure Links 653, 9000 Gent, Belgium;2. Nanjing Forestry University, 159 Longpan Rd, Xuanwu Qu, Nanjing Shi, Jiangsu Sheng, China;1. Department of Mathematics, 103 Neil Hall, Washington State University, Pullman, WA 99164, USA;2. Department of Wood Science and Engineering, 230 Richardson Hall, Oregon State University, Corvallis, OR 97331, USA |
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| Abstract: | Organosilicons and biocides with known effectiveness against fungal disfigurement were used for dipping or impregnating Scots pine sapwood specimens. All specimens were artificially or naturally weathered and the colour of all specimens was determined with a spectrophotometer at fixed times. After artificial weathering the specimens were used in blue stain tests according to EN 152 or according to the EN 152 reverse method. The naturally exposed specimens were inspected for fungal disfigurement on their back side. Although the results learn that the coating approach is far better than the wood preservatives approach for evaluating blue stain attack of organosilicon-treated wood, organosilicons fail to protect wood under laboratory conditions. Outdoor exposure, however, revealed that organosilicon impregnated specimens were better protected against fungal disfigurement. The addition of a biocide improves the performance. Artificially aged specimens did not show significant colour differences compared to untreated Scots pine sapwood, while naturally aged specimens did, depending on the treatment conditions and presence of biocides. Organosilicons are able to reduce leaching of (degraded) wood constituents, leading to fewer colour changes compared to untreated scots pine and to decreased availability of nutrients for superficial fungal growth. |
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