Effects of accelerated and outdoor ageing on leachability and properties of compreg-laminated sesenduk wood

• Main Authors: K., Mohammad Fitri, Ashaari, Zaidon, Lee, Seng Hua, Leemon, Nabil Fikri, Bakar, Edi Suhaimi
• Format: Article
• Language: English
• Published: Forest Research Institute Malaysia 2017
• Online Access: http://psasir.upm.edu.my/id/eprint/56297/1/Effects%20of%20accelerated%20and%20outdoor%20ageing%20on%20leachability%20and%20properties%20of%20compreg-laminated%20sesenduk%20wood.pdf; http://psasir.upm.edu.my/id/eprint/56297/; https://www.frim.gov.my/en/publication/journal-of-tropical-forest-science-jtfs/
• Institution: Universiti Putra Malaysia

This study evaluated the effects of accelerated and outdoor ageing on compreg-laminated sesenduk (Endospermum diadenum) wood and correlations between these two ageing methods were established. For outdoor ageing, samples were exposed to tropical weather for 1, 3 and 6 months. For accelerated ageing, cyclic boil-dry treatment involving 1, 2, 5 and 10 cycles were employed. Results revealed that density and weight loss were observed after the ageing treatments. After 6 months of outdoor ageing, water absorption of aged phenol formaldehyde and phenol formaldehyde urea-treated samples increased from 3.0 to 13.3% and from 4.1 to 26.6% respectively. Similar behaviour was also observed for samples which underwent 10 cycles of accelerated ageing. Samples subjected to outdoor ageing had thickness swelling higher than that of accelerated ageing (4.3-4.5% vs 2.4-3.7%). Most of the samples lost 8.3 to 22.4% of initial modulus of rupture after 1 month of outdoor ageing. Treated samples retained 61.7 to 77.1% of its initial modulus of elasticity after 10 cycles of accelerated ageing while the untreated samples retained only 48.7%. Emission of formaldehyde decreased with increased exposure times and cyclic boil-dry cycles. As confirmed by Pearson's correlation test, there were good correlations (r = 0.71-0.99) for properties of samples between accelerated ageing and outdoor ageing.