Titre:	Efeito do intemperismo artificial em quatro madeiras tropicais monitorado por espectroscopia de infravermelho (DRIFT)
Autre(s) titre(s):	Effect of artificial weathering on tropical woods monitored by infrared spectroscopy (DRIFT)
Auteur(s):	Pastore, Tereza Cristina Monteiro Oliveira, Cynara Caroline Kern de Rubim, Joel Camargo Santos, Kelly de Oliveira
Assunto::	Espectroscopia de infravermelho Intemperismo Madeira tropical
Date de publication:	2008
Editeur:	Sociedade Brasileira de Química
Référence bibliographique:	PASTORE, Tereza Cristina Monteiro et al. Efeito do intemperismo artificial em quatro madeiras tropicais monitorado por espectroscopia de infravermelho (DRIFT). Química Nova, São Paulo, v. 31, n. 8, p. 2071-2075, 2008. DOI: https://doi.org/10.1590/S0100-40422008000800030. Disponível em: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422008000800030&lng=pt&nrm=iso. Acesso em: 12 jan. 2021.
Abstract:	Four tropical woods, were investigated to compare their performance and natural resistances to artificial weathering using the diffuse reflectance infrared Fourier transform spectroscopy (DRIFT). The species were garapeira (Apuleia leiocarpa), itaúba (Mezilaurus itauba) and tauari (Couratari sp.), woods traditionally indicated for exterior uses, and marupá (Simarouba amara), that served as reference. The samples were submitted to cycles of UV radiation (350 nm) and water until 2,000 h. The photodegradation processes of woods surfaces were accomplished monitoring the changes in the intensities associated to lignin (1508 cm-1) and carbonyl group (1736 cm-1) absorptions. The results have shown that lignin was the first component to be photodegradated, resulting in surfaces mainly composed by cellulose, after 2,000 h of UV irradiation. The processes of formation and lixiviation of carbonyl compounds were different for each species. The experimental conditions used in this work were too severe to evaluate the wood density and extractives content influences during the treatment.
metadata.dc.description.unidade:	Instituto de Química (IQ)
Licença::	Química Nova - Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons (CC BY NC 4.0). Fonte: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422008000800030&lng=pt&nrm=iso&tlng=pt. Acesso em: 12 jan. 2021.
DOI:	https://dx.doi.org/10.1590/S0100-40422008000800030
Collection(s) :	Artigos publicados em periódicos e afins

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