Cheng Xiaowu, Lu Dong, Yue Kong, Lu Weidong, Zhang Zhongfeng
College of Civil Engineering, Nanjing Tech University, Nanjing 211800, China.
College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China.
Polymers (Basel). 2022 Aug 30;14(17):3574. doi: 10.3390/polym14173574.
Fast-growing poplar with low wood density has been generally regarded as a low-grade wood species and cannot be used as a building material due to its poor fire resistance. As the fire resistance of wood materials is positively correlated with density, combined treatment using resin impregnation, which imparts thermal resistance, and compression, which improves density, appeared to be a route toward improved combustion performance. Fast-growing poplar wood was modified with a combination of borate-containing phenol-formaldehyde resin impregnation and compression in a transverse direction at varying intensities. The effects of the combined treatment on fire resistance were then examined and discussed. Char residue morphology analysis and microscopic observations were conducted to reveal the effects and mechanism of the combined treatment on fire resistance improvement. The test results showed that fire resistance was greatly improved, including the static and dynamic bending performance at elevated and high temperatures, as well as the combustion performance. The higher the compression ratio was, the better the fire resistance of the modified wood.
木材密度低的速生杨树通常被视为低等级木材品种，由于其耐火性差，不能用作建筑材料。由于木材材料的耐火性与密度呈正相关，因此采用赋予热阻的树脂浸渍和提高密度的压缩相结合的处理方法，似乎是提高燃烧性能的一条途径。对速生杨木进行了含硼酚醛树脂浸渍和不同强度横向压缩相结合的改性处理。然后研究并讨论了组合处理对耐火性的影响。通过残炭形态分析和微观观察，揭示了组合处理对提高耐火性的作用和机理。试验结果表明，其耐火性得到了极大提高，包括高温和高温下的静态和动态弯曲性能以及燃烧性能。压缩比越高，改性木材的耐火性越好。
