Investigating the influence of fabrication parameters, flax fibre reinforcement, and ageing on interlaminar shear strength in thermoplastic-bonded wood veneers

Investigating the influence of fabrication parameters, flax fibre reinforcement, and ageing on interlaminar shear strength in thermoplastic-bonded wood veneers

This study investigates the suitability of two thermoplastic polymers that are non-toxic and environmentally friendly, namely polylactic acid (PLA) and recycled maleic anhydride-grafted polypropylene (rMAPP), as potential alternatives to formaldehyde-based adhesives in plywood production. Two types...

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Bibliographic Details
Published in:Journal of materials science Vol. 59; no. 24; pp. 10810 - 10832
Main Authors: Prunier, Clément, Rousseau, Jérôme, Butaud, Pauline, Jeannin, Thomas, Gabrion, Xavier, Placet, Vincent
Format: Journal Article
Language:English
Published: New York Springer US 01-06-2024
Springer Nature B.V
Subjects:
Adhesive strength
Adhesives
Aging
Bonding strength
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Composites & Nanocomposites
Covalent bonds
Crystallography and Scattering Methods
Fiber reinforcement
Flax
Hydroxyl groups
Interfacial shear strength
Lumens
Maleic anhydride
Manufacturing
Materials Science
Parameters
Performance evaluation
Plywood
Polylactic acid
Polymer Sciences
Shear strength
Solid Mechanics
Vegetable fibers
Veneers
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Summary:This study investigates the suitability of two thermoplastic polymers that are non-toxic and environmentally friendly, namely polylactic acid (PLA) and recycled maleic anhydride-grafted polypropylene (rMAPP), as potential alternatives to formaldehyde-based adhesives in plywood production. Two types of rotary cut wood veneers, beech and Douglas fir, are tested. The performance of interfaces is evaluated using interlaminar shear strength tests and compared to those obtained with a benchmark polyvinyl glue. This study examines the manufacturing process settings on interlaminar shear strength, as well as the influence of incorporating plant fibre reinforcement into the adhesive. It also evaluates the effects of accelerated ageing on the shear strength. The results indicate that manufacturing parameters tested within the specified range have a limited impact on shear strength. Both rMAPP and polyvinyl glue exhibit similar performance. This strong adhesion obtained with rMAPP is attributed to the formation of covalent bonds between the maleic anhydride (MA) and the hydroxyl groups within the amorphous constituents of the wood cell wall and to mechanical interlocking resulting from the polymer’s efficient penetration into the various wood pore structures, including cell lumens and lathe checks. The incorporation of flax fibres enhances interface performance under ambient conditions but has a negative effect in the case of hygro- and hydrothermal accelerated ageing. The results with PLA adhesive show more varied outcomes, with lower shear strength when manufactured via vacuum bagging technique. Furthermore, the performance of PLA adhesive does not meet plywood ageing standards due to its moisture sensitivity and susceptibility to hydrolysis degradation. Graphical abstract
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-024-09767-2