Data/hora: 25/06/2024 00:41:27

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 11/04/2016
Data da última atualização: | 10/07/2017
Autoria: | MATTOS, B. D.; MISSIO, A. L.; CADEMARTORI, P. H. G. de; GATTO, D. A.; MAGALHAES, W. L. E.
Afiliação: | Bruno D. Mattos, Integrated program in Engineering & Materials Science (PIPE), UFPR; André L. Missio, Forestry Engineering (PPGEF), UFSM; Pedro H. G. de Cademartori, Wood and Forestry Science Center (PPGEF), UFPR; Darci A. Gatto, Professor da UFSM; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF.
Título: | Color changes of wood from Pinus taeda and Schizolobium parahybum treated by in situ polymerization of methyl methacrylate using cross-linkers.
Ano de publicação: | 2016
Fonte/Imprenta: | Maderas. Ciencia y tecnología, Concepción, v. 18, n. 1, p. 113-124, ene. 2016.
DOI: | 10.4067/S0718-221X2016005000012
Idioma: | Inglês
Conteúdo: | The aim of this study was to evaluate the colorimetric properties of Pinus taeda and Schizolobium parahybum woods treated by in situ polymerization. The wood samples were impregnated in a vacuum/ pressure system and polymerized in an oven at 90°C for 10h, using benzoyl peroxide at 1,5wt% as the catalyst. The treatments were characterized using attenuated total reflectance infrared (ATRIR) spectroscopy and weight percentage gain (WPG). The color evaluation was performed using CIEL*a*b* concepts, specular gloss, and UV-Visible spectrophotometry. Treated woods showed increases in band intensity related to polymers (1730, 1460 and 1145 cm-1), and WPG ranged from 39 to 164%, depending of the wood species and treatments. Lightness decreased, while the Chroma, gloss and the color coordinates increased. A darkening of the all treated samples was observed, and confirmed by the decrease in the reflectance intensity between 400 and 700 nm.
Palavras-Chave: | Composites (materials); Espécie exótica; Free radical polymerization; Heat catalyst; Schizolobium parahybum; UV-Vis.
Thesagro: | Espécie nativa; Madeira; Pinus Taeda; Tratamento.
Thesaurus Nal: | Polymers; Wood treatment.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/142217/1/2016-Washington-Maderas-Collor.pdf
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (54941-1) - UPC - AP - DD -  -  -  - DIS