Color changes of wood from Pinus taeda and Schizolobium parahybum treated by in situ polymerization of methyl methacrylate using cross-linkers.

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.

Bibliographic Details

Main Authors:	MATTOS, B. D., MISSIO, A. L., CADEMARTORI, P. H. G. de, GATTO, D. A., MAGALHAES, W. L. E.
Other Authors:	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.
Format:	Artigo de periódico biblioteca
Language:	English eng
Published:	2016-04-11
Subjects:	Schizolobium parahybum, Espécie exótica, Free radical polymerization, UV-Vis, Heat catalyst, Composites (materials)., Madeira, Tratamento, Espécie nativa, Pinus Taeda., Wood treatment, Polymers.,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1043030
Tags:	Add Tag No Tags, Be the first to tag this record!