Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/37983
Registro completo de metadados
Campo DCValorIdioma
dc.creatorTonoli, Gustavo Henrique Denzin-
dc.creatorMendes, Rafael F.-
dc.creatorSiqueira, Gilberto-
dc.creatorBras, Julien-
dc.creatorBelgacem, Mohamed N.-
dc.creatorSavastano Júnior, Holmer-
dc.date.accessioned2019-12-03T19:42:26Z-
dc.date.available2019-12-03T19:42:26Z-
dc.date.issued2013-
dc.identifier.citationTONOLI, G. H. D. et al. Isocyanate-treated cellulose pulp and its effect on the alkali resistance and performance of fiber cement composites. Holzforschung, [S.l.], v. 67, n. 8, 2013.pt_BR
dc.identifier.urihttps://www.degruyter.com/view/j/hfsg.2013.67.issue-8/hf-2012-0195/hf-2012-0195.xmlpt_BR
dc.identifier.urihttp://repositorio.ufla.br/jspui/handle/1/37983-
dc.description.abstractThe impact of grafted surface of cellulose fibers on the mechanical and physical properties of fiber-cement composites (FCC) has been investigated. The grafting was performed with n-octadecyl isocyanate [i.e., with an aliphatic isocyanate (AI)], with the intention to protect the cellulose fiber from alkali degradation in the cement matrix. The chemical changes, observed by contact angle measurements and X-ray photoelectron spectroscopy, showed a higher hydrophobic character of AI-treated fibers. The strength of FCC was tested during 28 days of curing treatment. The extracted AI-treated fibers contributed to higher specific energy and final specific deflection after accelerated aging cycles in comparison with the reference composites reinforced with untreated fibers. The higher values of limit of proportionality and modulus of elasticity for composites with AI-treated fibers are an evidence of the densification of the fiber-matrix transition zone. The modulus of rupture values were higher for composites with AI-treated and Soxhlet-extracted fibers after 200 soak and dry aging cycles. In comparison with the reference, AI-treated fibers decreased the water absorption and the apparent porosity of the FCC. The modification of fibers could be a new strategy to improve the performance and stability of cement products reinforced with natural fibers.pt_BR
dc.languageen_USpt_BR
dc.publisherDe Gruyterpt_BR
dc.rightsrestrictAccesspt_BR
dc.sourceHolzforschungpt_BR
dc.subjectEucalyptus pulppt_BR
dc.subjectFiber-cement compositespt_BR
dc.subjectGraftingpt_BR
dc.subjectMechanical propertiespt_BR
dc.subjectN-octadecyl isocyanatept_BR
dc.subjectSurface modificationpt_BR
dc.subjectXPS analysispt_BR
dc.titleIsocyanate-treated cellulose pulp and its effect on the alkali resistance and performance of fiber cement compositespt_BR
dc.typeArtigopt_BR
Aparece nas coleções:DCF - Artigos publicados em periódicos
DEG - Artigos publicados em periódicos

Arquivos associados a este item:
Não existem arquivos associados a este item.


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.