Enhancement of bamboo-oriented strand board performance via moderate hydrothermal steaming of Dendrocalamus asper strands

초록

The objective of this study was to evaluate a moderate hydrothermal window within a moderate hydrothermal temperature of 115 degrees C to 126 degrees C for 1 h to 3 h on the bamboo-oriented strand board (BOSB) performance. Betung bamboo (Dendrocalamus asper) strands were steamed and converted into BOSB with a target density of 700 kg m-& sup3; using phenol-formaldehyde, and evaluated according to the JIS A 5908 standard. ATR-FTIR and TGA/DTG were used as strand-level indicators for selected schedules to track the carbonyl band at 1730 cm-1 to 1740 cm-& sup1; and the hemicellulose shoulder at 200 degrees C to 300 degrees C, respectively, alongside the cellulose peak at 320 degrees C to 360 degrees C. BOSB density and moisture content did not differ between treatments, allowing steaming effects to be interpreted without confounding from consolidation. Water absorption (WA) and thickness swelling (TS) decreased mainly with treatment time from 1 h to 3 h. Modulus of elasticity (MOE) and modulus of rupture (MOR) showed a significant temperature by time interaction, with 120 degrees C for 3 h performing best, and a decline at 126 degrees C for 3 h. The internal bond (IB) strength increased with significant main effects of both temperature and time. Overall, temperature (115 degrees C to 126 degrees C) was the dominant factor, which supports a severity-guided (log R-0) pathway to balancing dimensional stability and adhesion strength in BOSB.

키워드