Influência do conteúdo de xilanas na branqueabilidade, propriedades higroscópicas, fisico-mecânicas e óptica de polpas branqueadas de eucalipto

dc.creatorGomes, Valéria J.
dc.creatorLongue Jr, Dalton
dc.creatorColodette, Jorge L.
dc.creatorRibeiro, Robisnéa A.
dc.creatorBraun, Heder
dc.date2019-05-03T16:35:56Z
dc.date2019-05-03T16:35:56Z
dc.date2015-02
dc.date.accessioned2023-09-27T21:01:55Z
dc.date.available2023-09-27T21:01:55Z
dc.identifier01004042
dc.identifierhttp://dx.doi.org/10.5935/0100-4042.20140309
dc.identifierhttp://www.locus.ufv.br/handle/123456789/24993
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8953171
dc.descriptionBleached eucalypt kraft pulps are widely used in print and writing (P&W) and tissue paper manufacture. Among the quality requirements of pulp for these papers, xylan content has been controversial. The objective of this study was to evaluate the influence of xylan content on bleachability, hygroscopic, physic-mechanical and optical properties of the pulp. In this study industrial unbleached eucalyptus kraft pulp (15.6% xylans) treated with different NaOH loads to change its xylan content was used. Subsequently, pulps were bleached by the ODHT(EP)D sequence to achieve 90% ISO of brightness, then refined and submitted to hygroscopic, physicomechanical and optical tests. NaOH treatments decreased the xylan content to 14.5-5.9% using NaOH loads of 10-70 g L-1. Pulp bleachability was not significantly affected by xylan content decrease. The decrease in xylan content negatively affected the water retention value and Klemm capillarity of the pulp, while water absorption capacity was positively affected. Tensile and tear index were negatively influenced by the reduction in xylan content, whereas bulk and light scattering coefficient increased.
dc.formatpdf
dc.formatapplication/pdf
dc.languagepor
dc.publisherQuímica Nova
dc.relationv. 38, n. 02, p. 221- 226, fev. 2015
dc.rightsOpen Access
dc.subjectXylans
dc.subjectAlkaline extraction
dc.subjectBleachability
dc.subjectHygroscopic properties
dc.subjectOptical properties
dc.titleInfluência do conteúdo de xilanas na branqueabilidade, propriedades higroscópicas, fisico-mecânicas e óptica de polpas branqueadas de eucalipto
dc.typeArtigo


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