Journal
POLYMERS
Volume 13, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/polym13172849
Keywords
interfacial bond strength; wood-polymer composites; wood-polymer interface; XPS
Categories
Funding
- project WoodC.A.R. [861.421]
- Austrian Research Promotion Agency (FFG)
- Styrian Business Promotion Agency (SFG), Standortagentur Tirol
- company Collano AG
- company DOKA GmbH
- company DYNAmore GmbH
- company EJOT Austria GmbH
- company Forst-Holz-Papier
- company Holzcluster Steiermark GmbH
- company IB STEINER
- company Lean Management Consulting GmbH
- company Magna Steyr Engineering GmbH Co KG
- company MAN Truck Bus AG
- company Mattro Mobility Revolutions GmbH
- company Volkswagen AG
- company Weitzer Parkett GmbH Co KG
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The study found that birch and beech solid wood and plywood treated with polyamide 6 and polypropylene showed improved mechanical properties and interfacial adhesion. The penetration of polymers into the wood structure led to plastic deformation of the wood, influencing interfacial adhesion and mechanical interlocking.
Birch (Betula pendula Roth.) and beech (Fagus sylvatica L.) solid wood and plywood were overmolded with polyamide 6 (PA 6) and polypropylene (PP) to investigate their mechanical properties and interfacial adhesion. In the case of PA 6, maximum tensile shear strengths values of more than 8 to 9 MPa were obtained for birch and beech, respectively. The values are comparable to bond strengths of commercial joints bonded with formaldehyde-containing amino-plastics. Perpendicular to the wood elements, bond strength values of 3 MPa was achieved for PA 6. The penetration of the polymers into the wood structure results in a non-densified interphase and subsequent plastic deformation of the wood structure beyond the interphase. These compressed areas influenced the interfacial adhesion and mechanical interlocking. SEM and XPS analysis revealed different interpenetration behavior of the polymers into the wood structure, with chemical interaction confirmed only for wood and PA 6 but not PP.
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