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13C NMR study of presence of uron structures in amino adhesives and relation with wood-based panels performance

Authors

  • Nuno A. Costa,

    1. LEPAE – Laboratório de Engenharia de Processos, Ambiente e Energia, Faculdade de Engenharia, Universidade do Porto, Porto, Portugal
    2. ARCP – Associação Rede de Competências em Polímeros, Porto, Portugal
    3. EuroResinas – Indústrias Químicas, Portugal
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  • Daniela Martins,

    1. LEPAE – Laboratório de Engenharia de Processos, Ambiente e Energia, Faculdade de Engenharia, Universidade do Porto, Porto, Portugal
    2. ARCP – Associação Rede de Competências em Polímeros, Porto, Portugal
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  • João Pereira,

    1. LEPAE – Laboratório de Engenharia de Processos, Ambiente e Energia, Faculdade de Engenharia, Universidade do Porto, Porto, Portugal
    2. ARCP – Associação Rede de Competências em Polímeros, Porto, Portugal
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  • Jorge Martins,

    1. LEPAE – Laboratório de Engenharia de Processos, Ambiente e Energia, Faculdade de Engenharia, Universidade do Porto, Porto, Portugal
    2. DEMad – Departamento de Engenharia de Madeiras, Instituto Politécnico de Viseu, Viseu, Portugal
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  • João Ferra,

    1. EuroResinas – Indústrias Químicas, Portugal
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  • Paulo Cruz,

    1. EuroResinas – Indústrias Químicas, Portugal
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  • Adélio Mendes,

    1. LEPAE – Laboratório de Engenharia de Processos, Ambiente e Energia, Faculdade de Engenharia, Universidade do Porto, Porto, Portugal
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  • Fernão D. Magalhães,

    1. LEPAE – Laboratório de Engenharia de Processos, Ambiente e Energia, Faculdade de Engenharia, Universidade do Porto, Porto, Portugal
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  • Luísa H. Carvalho

    Corresponding author
    1. DEMad – Departamento de Engenharia de Madeiras, Instituto Politécnico de Viseu, Viseu, Portugal
    • LEPAE – Laboratório de Engenharia de Processos, Ambiente e Energia, Faculdade de Engenharia, Universidade do Porto, Porto, Portugal
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Correspondence to: L. H. Carvalho (E-mail: lhcarvalho@demad.estv.ipv.pt)

ABSTRACT

The chemical structure of amino adhesives produced by the strongly acid process was investigated by 13C 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. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4500–4507, 2013

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