Authors
Lucía Xavier, Rodrigo Coniglio, Fabián Bermúdez, Diego Passarella, Leonardo Clavijo
Published in
Bioresources and bioprocessing. Volume 12. Issue 1. Pages 73. Jul 11, 2025. Epub Jul 11, 2025.
Abstract
Approximately 1-2% of the wood processed for pulp production is converted into sawdust and pinchips, which are commonly burned for energy in industries that already produce excess power. This material, juvenile wood only containing sapwood, poses challenges for its valorization. This study explores the extraction of polyphenols from Eucalyptus wood residues generated by a pulp industry in Uruguay, aiming to evaluate their suitability as partial replacements in phenol-formaldehyde (PF) adhesives. Using solid-liquid extraction with sodium hydroxide and sodium sulfite, the extractions conditions were optimized through an experimental design considering sodium hydroxide and sodium sulfite charges, along with temperature as variables. The extracts were characterized based on phenolic content, condensed tannins content, antioxidant activity, and Stiasny number, to assess the adhesive potential. Adhesives formulated with 10%, 20%, and 30% PF resin substitution demonstrated a progressive reduction in tensile shear strength, with the 10% substitution achieving acceptable strength. While higher substitution levels compromised adhesive performance, the results suggest that formulation adjustments may improve performance at moderate substitution ratios. Furthermore, the high antioxidant capacity of the extracts opens up potential for their use in other high-value applications where natural antioxidants are increasingly sought after as safer and more sustainable alternatives to synthetic additives.
PMID:
40643785
Bibliographic data and abstract were imported from PubMed on 11 Jul 2025.
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