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Dynamic moisture resistance of chemical and thermal modified plywood.
- Source :
- Wood Material Science & Engineering; Feb2023, Vol. 18 Issue 1, p29-34, 6p
- Publication Year :
- 2023
-
Abstract
- Time-dependent response of treated and untreated plywood to various modes of water exposure was studied. Treatments included 1.3-dimethylol-4.5-dihydroxyethyleneurea (DMDHEU) and phenol-formaldehyde (PF). The effect of thermal modification was also investigated. Water exposure regimes included: one-sided water spray, one-sided water soak, and high humidity – all for a duration of 192 h. Direct measurements of dimensional change were recorded, and digital image correlation (DIC) was used to continuously monitor two-dimensional swelling. Over 90% of thickness swell occurred during the first 24 h of liquid water exposure. Swelling was still progressing under 90% relative humidity exposure after 192 h. DMDHEU and PF were statistically equivalent and improved thickness swell by 64% and 60%, for water spray and water soak, respectively. Chemical treatment improved thickness swell by approximately 41% under high humidity. Thermal modification improved thickness swell by 36%, 28%, and 28% for water spray, water soak, and high humidity exposure after 192 h, respectively. DIC measurements during the first 3 h of exposure revealed the fastest rate of thickness swell occurred with one-sided water spray and the slowest rate during one-sided water soak. Overall, PF-treated plywood exhibited the best initial water resistance. After 24 h DMDHEU and PF were equally effective treatments. [ABSTRACT FROM AUTHOR]
- Subjects :
- CHEMICAL resistance
DIGITAL image correlation
PLYWOOD
THERMAL resistance
MOISTURE
Subjects
Details
- Language :
- English
- ISSN :
- 17480272
- Volume :
- 18
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Wood Material Science & Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 162670721
- Full Text :
- https://doi.org/10.1080/17480272.2022.2109990