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dc.creatorNuno A. Costa
dc.creatorDaniela Martins
dc.creatorJoão Pereira
dc.creatorJorge Martins
dc.creatorJoão Ferra
dc.creatorPaulo Cruz
dc.creatorAdélio Mendes
dc.creatorFernão D. Magalhães
dc.creatorLuísa H. Carvalho
dc.description.abstractThe chemical structure of amino adhesives produced by the strongly acid process was investigated by C-13 Nuclear Magnetic Resonance spectroscopy. This technique allowed the identification of functional groups and its quantitative determination. Concentration of cyclic polymeric structures (urons) was shown to be related with adhesive performance and with particleboard physico-mechanical properties and formaldehyde content. Higher urons concentration presented lower viscosity and reactivity. Particleboards produced with resins with lower urons concentration presented lower formaldehyde content, but also lower internal bond strength. Wood-based panels produced fulfilled E1 class requirements for formaldehyde emissions, indicating that strongly acid process is an alternative to the conventional alkaline-acid process. (c) 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4500-4507, 2013
dc.relationinfo:eu-repo/grantAgreement/Agência de Inovação, S.A./Projectos de I&DT em Co-Promoção/SI IDT - 5347/2008/Concepção de sistemas adesivos taylor-made para o fabrico de painéis de madeira de baixa emissão de formaldeído/EO_Formaldehyde
dc.relationinfo:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EQU-EQU/111571/2009/ECOUF - Desenvolvimento de resinas ureia-formaldeído de nova geração com baixa emissão de formaldeído/ECOUF
dc.subjectChemical sciences
dc.titleC-13 NMR Study of Presence of Uron Structures in Amino Adhesives and Relation with Wood-Based Panels Performance
dc.typeArtigo em Revista Científica Internacional
dc.contributor.uportoFaculdade de Engenharia
dc.subject.fosCiências exactas e naturais::Química
dc.subject.fosNatural sciences::Chemical sciences
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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