30
Appendices
Appendix 2.1: Processes for making double lap shear (DLS) specimen from wood
strands.
DLS specimens
Hybrid
poplar specimens cutout
parallel to the grain
Dispersing Phenol
Formaldehyde (PF) resin
onto the strands
Gluing
strands together to
make DLS specimens
Wire wrapped around rod
Adhesive
film layer
Hot press
32
Figure 2.1A shows the bondline image of unmodified strand. PF resins were filled
into the vessel. The crack line along the interface is due to image specimen preparation.
Figure 2.2A shows the bondline image of modified strands (VTC). Unlike Figure
2.1A, Figure 2.2A less adhesive moves (or penetrates) into
the wood cells, more resin at
the bondline. The crack line along the interface is due to image specimen preparation.
33
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