Approaching a new generation of fiberboards taking advantage of self lignin as green adhesive

Juan Domínguez-Robles, Quim Tarrés, Marc Delgado-Aguilar*, Alejandro Rodríguez, Francesc Xavier Espinach, Pere Mutjé

*Corresponding author for this work

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

This study describes the use of lignin as natural adhesive for the production high density fiberboards (HDF) made from wheat straw. In the present work, this agricultural residue was used to produce thermomechanical pulp and the used lignin was obtained from the spent liquors generated in the same process. A hot pressing process was conducted to manufacture these fiberboards and different percentages of this green adhesive were targeted. The wheat straw raw material and its pulp were characterized. Apart from that, the chemical composition and the thermal properties of the lignin sample were evaluated. Physical and mechanical properties were assessed and the results revealed that the panels made only with wheat straw fibers had a flexural strength value (52.79 MPa) even above the value corresponding to the commercial HDF (41.70 MPa). Also, results showed that the incorporation of soda-lignin lead to lignocellulosic composites that, as lignin content was increased (from 0 to 15%), mechanical properties were enhanced. The highest mechanical performance was reached for fiberboards at 15% of lignin with a flexural strength of 96.81 MPa, a flexural modulus of 3.55 GPa, and finally an internal bond of 1.46 MPa.

Original languageEnglish
Pages (from-to)927-935
Number of pages9
JournalInternational Journal of Biological Macromolecules
Volume108
Early online date07 Nov 2017
DOIs
Publication statusPublished - Mar 2018

Keywords

  • Bioadhesives
  • Lignin
  • Wheat straw

ASJC Scopus subject areas

  • Structural Biology
  • Biochemistry
  • Molecular Biology

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