Challenges in substituting less ecofriendly materials
Performance
Mitigartion process
Scalability
Sustainability
Green chemistry
Recylability
Wood protection issues
Flammability
Durability
UV Protection
Dimensional Stability
Wood treatments
Surface (coatings, gluing)
Bulk (chemical, thermal)
Modification parts
Cell wall modification: thermal, funghi modification, chemical modification
Lumina filling (e.g. with resin): increase density, limited impact
Bulking (both together): Reduce swelling but increase density
Thermal modification
Heat treatment >160°
Parameters: species, MC, sample size, geometry, temp, duration, pressure, medium
Property changes: reduced EMC, Higher dimensional stability, higher durability, darker color, higher brittleness
Chemical modification - Furfurylation
leads to bulking —> cross linking and luina filling
Polymerizes in the wood
Higher resistance againt degradation, dimensional stability, hardness, resistance to weather
Acetylation
Less adsoption of moisture, increased compressive strength
Higher compressive strength but lower E-modulus
Increased durability against white rod
DMDHEU
Dimethylol dihydroxy ethylene urea
Cross-linking treatent
Application by vacuum pressure impregnation
Antiswelling efficiency better
Wood conservation
Prevent fro shrinkage after getting out of water
Fill in PEG
Last changeda year ago