Mid-infrared spectroscopy and colorimetry of curupixá wood: artificial weathering along with finishing products

Authors

DOI:

https://doi.org/10.5902/1980509831248

Keywords:

Wood surface, Photodegradation, Varnish, Stain

Abstract

This study investigates the changes in color and in the chemical structures of the surface of curupixá wood (Micropholis sp.), which was exposed to artificial weathering with two wood finishing products. We treated the sample surfaces with varnish and stain, and then we set them to artificial weathering for 700 hours, in accordance with ASTM G154 (2006). Our team used The Fourier Transform Mean Infrared (FT-MIR) and the CIELAB (1976) system in order to outline changes in the chemical and colorimetric structure of the wood surface, respectively. The color of curupixá wood got darker after applying finishing products. The color variation following the weathering process was appreciable in the control sample and very appreciable in the treated wood sample. The analysis of medium infrared spectroscopy demonstrated the depolymerization of lignin accompanied by the formation of carbonyls in all cases. In addition, mid-infrared displayed a concentration drop due to the heavy metal leaching. These ocurrences reveal degradation in the structural chemical components of the wood, and that the finishing products did not affect the weathering process at all.

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Author Biographies

Robert Rossi Silva de Mesquita, Universidade de Brasília, Brasília, DF

Engenheiro Florestal formado pela Universidade de Brasília. Mestre em tecnologia e utilização de produtos florestais. Doutorando em tecnologia e utilização de Produtos Florestais. Ênfase em colorimetria e intemperismo da madeira.

Marcella Hermida de Paula, Universidade de Brasília, Brasília, DF

Formada em Engenharia Florestal pela Universidade de Brasília e Mestre em Ciências Florestais na área de Tecnologia de Produtos Florestais.

Joaquim Carlos Gonçalez, Universidade de Brasília, Brasília, DF

Possui graduação em Engenharia Florestal pela Universidade Federal de Viçosa (1980), mestrado em Ciência Florestal pela Universidade Federal de Viçosa (1983) e doutorado em Sciences Forestières - Ecole Nationale du Génie Rural et des Forêts - ENGREF/França, (1993). Atualmente é professor Titular da Universidade de Brasília. Tem experiência na área de Recursos Florestais e Engenharia Florestal, com ênfase em Tecnologia e Utilização de Produtos Florestais, atuando principalmente nos seguintes temas: madeira, colorimetria, radiação ultravioleta, ultrassom, analise de imagem, valorizacao, moveis, introdução de novas tecnologias, celulose, qualidade e propriedades.

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Published

2020-09-01

How to Cite

Mesquita, R. R. S. de, Paula, M. H. de, & Gonçalez, J. C. (2020). Mid-infrared spectroscopy and colorimetry of curupixá wood: artificial weathering along with finishing products. Ciência Florestal, 30(3), 688–699. https://doi.org/10.5902/1980509831248

Issue

Vol. 30 No. 3 (2020)

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Articles

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A revista CIÊNCIA FLORESTAL reserva-se o direito de realizar, nos originais, alterações de ordens normativas, ortográficas e gramaticais, com vistas a manter o padrão escolar da língua, mas respeitando o estilo dos autores. As provas finais podem ou não ser enviadas aos autores.

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