Please use this identifier to cite or link to this item: http://hdl.handle.net/10216/103960
Author(s): João M. M. Ferra
Martin Ohlmeyer
Adélio M. Mendes
Mário Rui N. Costa
Luisa H. Carvalho
Fernão D. Magalhães
Title: Evaluation of urea-formaldehyde adhesives performance by recently developed mechanical tests
Issue Date: 2011
Abstract: In the open literature, two main strategies can be found for synthesizing urea-formaldehyde (UF) resins. One is the alkaline-acid process, which takes place in three steps, usually an alkaline methylolation followed by an acid condensation and then the addition of a final amount of urea. The other process consists of four steps, the main difference being an initial condensation in strongly acid environment. In this work, we evaluate the curing behaviour of four resins produced using the aforementioned processes by the Integrated Pressing and Testing System (IPATES) and the Automated Bonding Evaluation System (ABES). The characterisation of the bond strength development during hot pressing by ABES and IPATES shows that the four resins will have different performances in the bonding process of wood-based composites. For each resin, the effect of pressing parameters such as temperature, adhesive and hardener ratios on shear strength (ABES) and internal bond (IPATES) during hot pressing is put into evidence.
Subject: Ciências Tecnológicas, Engenharia química
Technological sciences, Chemical engineering
URI: http://hdl.handle.net/10216/103960
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Programa de Financiamento Plurianual de Unidades de I&D/PEst-C/EQB/LA0020/2011/Projeto Estratégico-LA 20 - 2011-2012/LA 20
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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