Cong Rizheng, Cai Taoyang, Ge-Zhang Shangjie, Yang Hong, Zhang Chang
School of Civil Engineering and Transportation, Northeast Forestry University, Harbin 150040, China.
Aulin College, Northeast Forestry University, Harbin 150040, China.
Polymers (Basel). 2024 Jul 8;16(13):1949. doi: 10.3390/polym16131949.
The efficient exploitation of planted fast-growing wood is crucial for enhancing wood resource utilization. In this study, the fast-growing poplar wood was modified by in situ impregnation through vacuum impregnation with polyvinyl alcohol and nano-silica sol as impregnation modifiers, combined with delignification-freezing pretreatment. The samples were characterized by FTIR, XRD, SEM, and the universal mechanical testing machine. The results showed that the wrinkle deformation and cracking of the wood blocks were greatly alleviated after the delignification-freezing pretreatment and the polyvinyl alcohol and nano-silica sol were successfully integrated into the wood. The resulting polyvinyl alcohol-silica sol poplar composites exhibited about 216%, 80% and 43% higher compressive strength with respect to delignified wood, natural wood and impregnated natural wood, respectively, thereby demonstrating superior mechanical properties and potential opportunities for value-added and efficient utilization of low-quality wood.
高效利用人工种植的速生木材对于提高木材资源利用率至关重要。在本研究中，通过真空浸渍法，以聚乙烯醇和纳米二氧化硅溶胶作为浸渍改性剂，结合无脱木素冷冻预处理，对速生杨木进行原位浸渍改性。采用傅里叶变换红外光谱仪（FTIR）、X射线衍射仪（XRD）、扫描电子显微镜（SEM）和万能材料试验机对样品进行表征。结果表明，经过无脱木素冷冻预处理后，木块的皱纹变形和开裂得到了极大缓解，聚乙烯醇和纳米二氧化硅溶胶成功地融入了木材中。所得的聚乙烯醇-二氧化硅溶胶杨树复合材料相对于脱木素木材、天然木材和浸渍天然木材的抗压强度分别提高了约216%、80%和43%，从而显示出优异的力学性能以及对低质量木材进行增值和高效利用的潜在机会。
