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Lignins as macromonomers for polyurethane synthesis: A comparative study on hydroxyl group determination

Authors

  • Carolina Andreia Cateto,

    1. Laboratory of Separation and Reaction Engineering, Instituto Politécnico de Bragança, Campus de Santa Apolónia, Apartado 1134, 5301-857 Bragança, Portugal
    2. Laboratory of Separation and Reaction Engineering, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
    3. Matériaux Polymères, École Française de Papeterie et des Industries Graphiques, BP 65, 38402 St. Martin d'Hères, France
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  • Maria Filomena Barreiro,

    Corresponding author
    1. Laboratory of Separation and Reaction Engineering, Instituto Politécnico de Bragança, Campus de Santa Apolónia, Apartado 1134, 5301-857 Bragança, Portugal
    • Laboratory of Separation and Reaction Engineering, Instituto Politécnico de Bragança, Campus de Santa Apolónia, Apartado 1134, 5301-857 Bragança, Portugal
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  • Alírio Egídio Rodrigues,

    1. Laboratory of Separation and Reaction Engineering, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
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  • Marie Christine Brochier-Salon,

    1. Matériaux Polymères, École Française de Papeterie et des Industries Graphiques, BP 65, 38402 St. Martin d'Hères, France
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  • Wim Thielemans,

    1. Matériaux Polymères, École Française de Papeterie et des Industries Graphiques, BP 65, 38402 St. Martin d'Hères, France
    Current affiliation:
    1. Driving Innovation in Chemistry and Chemical Engineering, School of Chemistry and School of Chemical, Environmental, and Mining Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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  • Mohamed Naceur Belgacem

    1. Matériaux Polymères, École Française de Papeterie et des Industries Graphiques, BP 65, 38402 St. Martin d'Hères, France
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Abstract

The hydroxyl group contents of four technical lignins [Indulin AT (Meadwestvaco), Alcell (Repap), Curan 27-11P (Borregaard LignoTech), and Sarkanda (Granit SA)] were investigated in view of their valorization as polyols in polyurethane synthesis. The different hydroxyl group contents were determined by the following methods: titration and 1H-NMR, 13C-NMR, and 31P-NMR spectroscopy. The titration method chosen was on the basis of a standard method commonly used to characterize commercial polyols for polyurethanes synthesis. The values of the total and phenolic hydroxyl contents determined by the different techniques were found to be in good agreement. For the total hydroxyl contents, coefficients of variation of 5.6% (Alcell), 3.2% (Indulin AT), 2.3% (Sarkanda), and 6.2% (Curan 27-11P) were established. For the phenolic hydroxyl contents, a good correlation was observed between data obtained from 31P-NMR and 13C-NMR for all lignin samples, except for the Sarkanda lignin, for which a relatively high coefficient of variation (12.6%) was found. For softwood lignins (Indulin AT and Curan 27-11P), the phenolic hydroxyl content determined by 1H-NMR was always lower than that deduced from 31P-NMR and 13C-NMR spectroscopy. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

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