Effect of geometry and hybrid adhesive on strength of finger joints of Pinus elliottii subject to humidity and temperature

Effect of geometry and hybrid adhesive on strength of finger joints of Pinus elliottii subject to humidity and temperature

Author Messmer, Nigel R. Autor UNIFESP Google Scholar
Anjos, Erick G. R. Autor UNIFESP Google Scholar
Guerrini, Lilia M. Autor UNIFESP Google Scholar
Oliveira, Mauricio P. Autor UNIFESP Google Scholar
Abstract The optimized bonding of glued finger joints is required for structural and nonstructural applications. The use of nonspecific adhesives, combined with the joint geometry and exposure of joints to humidity and temperature, are factors that can compromise the durability of glued joints. The main objective of this study is the development of cross-linking poly(vinyl acetate) (PVAc) hybrid adhesive to produce nonstructural finger joints of Pinus elliottii with finger lengths of 6.5 and 4.5 mm. The adhesives were produced by emulsion copolymerization of vinyl acetate with n-butyl acrylate with different amounts of N-methylol acrylamide and blended with resorcinol-formaldehyde resin (RF) and aluminum chloride (AlCl3). The rheological behavior of adhesives was investigated. We found that the joint configuration and the exposition time employed influenced joint strength. The PVAc/RF adhesive showed a thicker bond line and consequent deeper penetration into the pores of the wood as verified by microscopy analysis. Statistically differences in bond strength of the adhesive joints were found with respect to different conditioning times and finger length. The highest values were exhibited by the joints produced with a finger length of 6.5 mm and glued with the hybrid adhesive (AD-4) than that joints produced with a finger length of 4.5 mm.
Keywords Emulsion polymerization
finger joint
hybrid adhesive
poly(vinyl acetate)
rheological behavior
xmlui.dri2xhtml.METS-1.0.item-coverage Abingdon
Language English
Sponsor Sao Paulo Research Foundation (FAPESP)
Hexion Quimica
Grant number FAPESP: [2013/25619-3
Date 2018
Published in Journal Of Adhesion. Abingdon, v. 94, n. 8, p. 597-614, 2018.
ISSN 0021-8464 (Sherpa/Romeo, impact factor)
Publisher Taylor & Francis Ltd
Extent 597-614
Origin http://dx.doi.org/10.1080/00218464.2017.1319281
Access rights Closed access
Type Article
Web of Science ID WOS:000434343500002
URI https://repositorio.unifesp.br/handle/11600/54278

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