期刊
APPLIED SURFACE SCIENCE
卷 276, 期 -, 页码 86-94出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2013.03.031
关键词
Surface degradation; Thermally treated jack pine; Acrylic polyurethane; Accelerated weathering; CeO2 nano particles; Color change; Wetting; ATR-FT-IR analysis
类别
资金
- Fonds quebecois de la recherche sur la nature et les technologies (FQRNT)
- Developpement Economique Canada (DEC)
- Ministere du Developpement Economique, de l'Innovation et de l'Exportation (MDEIE)
- Conference Regionale des Elus du Saguenay-Lac-St-Jean (CRE)
- Universite du Quebec a Chicoutimi (UQAC)
- Fondation de l'Universite du Quebec a Chicoutimi (FUQAC)
- FPInnovation
- Alberta Innovates
- PCI Ind.
- Ohlin Thermotech
- Kisis Technology
- Industries ISA
The thermally treated wood is a new value-added product and is very important for the diversification of forestry products. It drew the attention of consumers due to its attractive dark brown color. However, it loses its color when exposed to outside environment. Therefore, development of a protective coating for this value added product is necessary. In the present study, the efficiency of CeO2 nano particles alone or in combination with lignin stabilizer and/or bark extracts in acrylic polyurethane polymer was investigated by performing an accelerated weathering test. The color measurement results after accelerated weathering demonstrated that the coating containing CeO2 nano particles was the most effective whereas visual assessment suggested the coating containing CeO2 nano particles and lignin stabilizer as the most effective coating. The surface polarity changed for all the coatings during weathering and increase in contact angle after weathering suggested cross linking and reorientation of the polymer chain during weathering. The surface chemistry altered during weathering was evaluated by ATR-FTIR analysis. It suggested formation of different carbonyl byproducts during weathering. The chain scission reactions of the urethane linkages were not found to be significant during weathering. (C) 2013 Elsevier B. V. All rights reserved.
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