Chemical changes of heat treated pine and eucalypt wood monitored by FTIR

Esteves, B.; Velez Marques, A.; Domingos, I.; Pereira, H.

Publication

Chemical changes of heat treated pine and eucalypt wood monitored by FTIR

2013Journal article

dc.contributor.author	Esteves, B.
dc.contributor.author	Velez Marques, A.
dc.contributor.author	Domingos, I.
dc.contributor.author	Pereira, H.
dc.date.accessioned	2017-02-02T09:05:30Z
dc.date.available	2017-02-02T09:05:30Z
dc.date.issued	2013
dc.description.abstract	A hardwood, Eucalyptus globulus Labill., and a softwood Pinus pinaster Aiton., were heat treated at temperatures between 170 and 210ºC in an oven and in an autoclave. The samples were pre-extracted with dichloromethane, ethanol and water and ground prior to Fourier Transform Infrared (FTIR) spectroscopic analysis. The heat treatment caused significant changes in the chemical composition and structure of wood, in lignin and polysaccharides. Hemicelluloses were the first to degrade as proved by the initial decrease of the 1730 cm-1 peak due to the breaking of acetyl groups in xylan. Hardwood lignin changed more than softwood lignin, with a shift of maximum absorption from 1505 cm-1 to approximately 1512 cm-1 due to decrease of methoxyl groups, loss of syringyl units or breaking of aliphatic side-chains. The macromolecular structure becomes more condensed and there is a clear increase of non-conjugated (1740 cm-1) in relation to conjugated groups (1650 cm-1). However, the changes induced by the thermal treatment are difficult to monitor by FTIR spectroscopy due to the different chemical reactions occurring simultaneously.	pt_PT
dc.description.version	info:eu-repo/semantics/publishedVersion	pt_PT
dc.identifier.citation	Esteves, B, Velez Marques, A, Domingos, I, & Pereira, H. (2013). Chemical changes of heat treated pine and eucalypt wood monitored by FTIR. Maderas. Ciencia y tecnología, 15(2), 245-258.	pt_PT
dc.identifier.doi	10.4067/S0718-221X2013005000020	pt_PT
dc.identifier.issn	0718-221X
dc.identifier.issn	0717-3644
dc.identifier.uri	http://hdl.handle.net/10400.19/4301
dc.language.iso	eng	pt_PT
dc.peerreviewed	yes	pt_PT
dc.publisher	Scielo	pt_PT
dc.relation.publisherversion	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2013000200010	pt_PT
dc.rights.uri	http://creativecommons.org/licenses/by-nc/4.0/	pt_PT
dc.subject	Eucalyptus globulus	pt_PT
dc.subject	FTIR	pt_PT
dc.subject	Heat treatment	pt_PT
dc.subject	Pinus pinaster	pt_PT
dc.title	Chemical changes of heat treated pine and eucalypt wood monitored by FTIR	pt_PT
dc.type	journal article
dspace.entity.type	Publication
oaire.citation.endPage	258	pt_PT
oaire.citation.issue	2	pt_PT
oaire.citation.startPage	245	pt_PT
oaire.citation.title	Maderas. Ciencia y tecnología	pt_PT
oaire.citation.volume	15	pt_PT
rcaap.rights	openAccess	pt_PT
rcaap.type	article	pt_PT