Fiberboards based on filled lignin resin and petiole fibers
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Fiberboards were manufactured from filled phenolic resins (lignin-formaldehyde or glyoxal) and petiole date palm fibers. Lignin was obtained from paper industry waste black liquor. To improve lignin reactivity and increase the bonding strength between matrix and fiber, phosphogypsum (PG) was used as a filler in the resin formulation from 1 to 3 wt%. Phosphogypsum exhibited excellent performance as binder; this was verified by a decrease in the gelation time and an increase in internal bond (IB) in fiberboards. The analysis confirmed that resin reactivity depends on aldehyde types (glyoxal or formaldehyde) and PG proportion. Most of the obtained boards were of good quality [modulus of elasticity (MOE) up to 1230 MPa; modulus of rupture (MOR) up to 25 MPa; internal bond (IB) up to 0.23 MPa; water absorption (WA) up to 28%].
KeywordsPetiole date palm fibers Lignin Fiberboard Phosphogypsum
The authors would like to express their sincere thanks to Professor Mohamed Naceur Belgacem, Director of INP-Pagora Grenoble, for his valuable advice and assistance. The authors express sincere thanks to the Tunisian Higher Education and Scientific Research Ministry for its financial.
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