Weathering Stability and Durability of Birch Plywood Modified with Different Molecular Weight Phenol-Formaldehyde Oligomers
| Autor: | Vladimirs Biziks, Holger Militz, Brendan Nicholas Marais, Janis Rizikovs, Juris Grinins |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Polymers and Plastics Formaldehyde Weathering birch plywood 02 engineering and technology 01 natural sciences Article soft-rot lcsh:QD241-441 chemistry.chemical_compound stomatognathic system lcsh:Organic chemistry 010608 biotechnology Phenol formaldehyde resin phenol-formaldehyde resin Phenol Solid content chemistry.chemical_classification weathering stability Chemistry technology industry and agriculture molecular weight General Chemistry 021001 nanoscience & nanotechnology Solid wood Durability 0210 nano-technology Water spray Nuclear chemistry |
| Zdroj: | Polymers, Vol 13, Iss 175, p 175 (2021) Polymers Volume 13 Issue 2 |
| ISSN: | 2073-4360 |
| DOI: | 10.3390/polym13020175 |
| Popis: | This study investigated the effect of phenol-formaldehyde (PF) resin treatment on the weathering stability and biological durability of birch plywood. Silver birch (Betula pendula) veneers were vacuum-pressure impregnated with four different PF resins with average molecular weights (Mw) of 292 (resin A), 528 (resin B), 703 (resin C), and 884 g/mol (resin D). The aging properties of PF resin modified birch plywood were analyzed using artificial weathering with ultraviolet (UV) light, UV and water spray, and weathering under outdoor conditions. The same combinations of PF-treated plywood specimens were then tested in soil-bed tests to determine their resistance against soft-rot wood decay. It was not possible to compare weathering processes under artificial conditions to processes under outdoor conditions. However, the weathering stability of birch plywood treated with PF resins A, B, and C, scored better than plywood treated with commercial resin D (regardless of solid content concentration [%]). Results from unsterile soil bed tests showed improvements in resistance to soft-rot wood decay compared to untreated plywood and solid wood. Mass loss [%] was lowest for birch plywood specimens treated with resin of highest solid content concentration (resin D, 20%). Provisional durability ratings delivered durability class (DC) ratings of 2&ndash 3, considerably improved over untreated solid wood and untreated birch plywood (DC 5). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |