Dasiewicz Julia, Wronka Anita, Rizikovs Janis, Kowaluk Grzegorz
Faculty of Wood Technology, Warsaw University of Life Sciences-SGGW, Nowoursynowska Street 159, 02-787 Warsaw, Poland.
Department of Technology and Entrepreneurship in Wood Industry, Institute of Wood Sciences and Furniture, Warsaw University of Life Sciences-SGGW, 02-787 Warsaw, Poland.
Materials (Basel). 2025 Sep 5;18(17):4171. doi: 10.3390/ma18174171.
This study investigates the use of suberinic acid residues (SARs), derived from birch outer bark, as a bio-based additive in high-density fiberboard (HDF). Boards with target densities of 800 kg m were produced with SAR contents of 0, 1, 5, 10, 20, and 50%. Standardized tests evaluated mechanical properties: screw withdrawal resistance, modulus of elasticity, modulus of rupture, and internal bond, as well as moisture resistance through surface water absorption, water absorption, and thickness swelling. Density profiles were also analyzed. SAR content influenced HDF performance in a concentration-dependent manner. The most notable improvements in mechanical properties occurred at 5% SAR, where fine particles likely enhanced internal bonding and stiffness. However, higher SAR levels led to reduced mechanical strength, possibly due to an excessive particle surface area exceeding the adhesive's bonding capacity. Moisture resistance declined with increased SAR, attributed to its hydrophilic nature and process parameters, although SAR-modified boards still outperformed those with other biodegradable additives like starch. SAR also affected the density profile, improving core densification at moderate levels. Overall, SAR shows potential as a renewable additive for enhancing HDF performance, particularly at low concentrations, balancing mechanical strength and environmental benefits.
本研究调查了源自桦木外皮的辛二酸残渣（SARs）作为高密度纤维板（HDF）中一种生物基添加剂的用途。生产了目标密度为800 kg/m³的板材，其SAR含量分别为0%、1%、5%、10%、20%和50%。通过标准化测试评估了机械性能：抗螺钉拔出力、弹性模量、断裂模量和内结合强度，以及通过表面吸水率、吸水率和厚度膨胀率评估的防潮性能。还分析了密度分布。SAR含量以浓度依赖的方式影响HDF的性能。在SAR含量为5%时，机械性能有最显著的改善，此时细颗粒可能增强了内部结合力和硬度。然而，较高的SAR水平导致机械强度降低，这可能是由于颗粒表面积过大超过了粘合剂的粘结能力。随着SAR含量增加，防潮性能下降，这归因于其亲水性和工艺参数，尽管经SAR改性的板材仍优于含有淀粉等其他可生物降解添加剂的板材。SAR还影响密度分布，在中等含量时改善了芯层致密化。总体而言，SAR显示出作为一种可再生添加剂来提高HDF性能的潜力，特别是在低浓度下，能平衡机械强度和环境效益。
