Impact of bleaching pine fibre on the fibre/cement interface

Autor(es)

Tonoli, G. H. D. ^[1] ; Belgacem, M. N. ^[2] ; Bras, J. ^[2] ; Pereira-da-Silva, M. A. ^{[3, 4]} ; Rocco Lahr, F. A. ^[5] ; Savastano, Jr., H. ^[6]

Afiliação do(s) autor(es)

^[1] Univ Fed Lavras, Dept Forest Sci, BR-37200000 Lavras, MG - Brazil

^[2] CNRS, Lab Genie Proc Papetiers LGP2, UMR 5518, F-38402 St Martin Dheres - France

^[3] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[4] Ctr Univ Cent Paulista UNICEP, BR-13563470 Sao Carlos, SP - Brazil

^[5] Univ Sao Paulo, Escola Engn Sao Carlos, Dept Struct Engn, BR-13566590 Sao Carlos, SP - Brazil

^[6] Univ Sao Paulo USP, Fac Zootecn & Engn Alimentos, Dept Food Engn, BR-13635900 Pirassununga, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Materials Science; v. 47, n. 9, p. 4167-4177, MAY 2012.
• Citações Web of Science: 25

Resumo

The goal of this article was to evaluate the surface characteristics of the pine fibres and its impact on the performance of fibre-cement composites. Lower polar contribution of the surface energy indicates that unbleached fibres have less hydrophilic nature than the bleached fibres. Bleaching the pulp makes the fibres less stronger, more fibrillated and permeable to liquids due to removal the amorphous lignin and its extraction from the fibre surface. Atomic force microscopy reveals these changes occurring on the fibre surface and contributes to understanding the mechanism of adhesion of the resulting fibre to cement interface. Scanning electron microscopy shows that pulp bleaching increased fibre/cement interfacial bonding, whilst unbleached fibres were less susceptible to cement precipitation into the fibre cavities (lumens) in the prepared composites. Consequently, bleached fibre-reinforced composites had lower ductility due to the high interfacial adhesion between the fibre and the cement and elevated rates of fibre mineralization. (AU)

• Processo FAPESP: 05/59072-4 - Utilização de fibras curtas de eucalipto em fibrocimento sem amianto
• Beneficiário: Gustavo Henrique Denzin Tonoli
• Modalidade de apoio: Bolsas no Brasil - Doutorado