Liu Minghui, Li Wanju, Wang Hankun, Zhang Xuexia, Yu Yan
Institute of New Bamboo and Rattan Based Biomaterials, International Center for Bamboo and Rattan, Beijing 100102, China.
SFA and Beijing Co-built Key Lab for Bamboo and Rattan Science & Technology, Beijing 100102, China.
Materials (Basel). 2020 Mar 5;13(5):1157. doi: 10.3390/ma13051157.
In this study, bamboo was treated with an optimized surface furfurylation process. With this process, dimensionally stable and highly biologically durable bamboo material could be prepared without mechanical reduction. The anti-swelling efficiency (ASE) could reach 50% with a low weight percent gain (WPG about 13%). By using SEM, nanoindentation, and Imaging FTIR, we demonstrated that this high performance improvement is attributed to the unique furfuryl alcohol (FA) resin distribution pattern in the modified bamboo, namely a higher concentration of FA resin located in the region near to the surface of bamboo, and what is more, the preferred distribution of FA resin within the cell walls of parenchyma cells, which is known to be the weak point of bamboo both for biological durability and mechanical performances. Such graded modified bamboo could be utilized as a reliable engineering material for outdoor applications.
在本研究中，采用优化的表面糠醇化工艺对竹子进行处理。通过该工艺，可以制备出尺寸稳定且具有高生物耐久性的竹材，而无需进行机械加工。抗膨胀效率（ASE）可达50%，增重率较低（WPG约为13%）。通过扫描电子显微镜（SEM）、纳米压痕和成像傅里叶变换红外光谱（Imaging FTIR），我们证明了这种高性能的提升归因于改性竹材中独特的糠醇（FA）树脂分布模式，即靠近竹材表面区域的FA树脂浓度较高，而且，FA树脂在薄壁细胞的细胞壁内优先分布，而薄壁细胞已知是竹子在生物耐久性和机械性能方面的薄弱点。这种梯度改性竹材可作为可靠的工程材料用于户外应用。
