Yuan Tiancheng, Huang Yaqian, Zhang Tao, Wang Xinzhou, Li Yanjun
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
Bamboo Engineering and Technology Research Center, State Forestry and Grassland Administration, Nanjing 210037, China.
Polymers (Basel). 2022 Feb 8;14(3):646. doi: 10.3390/polym14030646.
In recent years, saturated steam heat treatment has been considered as an environmentally friendly and cost-effective modification method compared with traditional heat treatment media. In this study, bamboo was treated by saturated steam, and the change in chemical composition, cellulose crystallinity index, micro-morphology, and micromechanical properties were analyzed by a wet chemistry method, Fourier transform infrared (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), nanoindentation, and so on. Results illustrated that the parenchyma cell walls were distorted due to the decomposition of hemicellulose and cellulose in bamboo samples. As expected, the hemicellulose and cellulose content decreased, whereas the lignin content increased significantly. In addition, the cellulose crystallinity index and thus the micromechanical properties of bamboo cell walls increased. For example, the hardness increased from 0.69 GPa to 0.84 GPa owing to the enhanced crystallinity index and lignin content.
近年来，与传统热处理介质相比，饱和蒸汽热处理被认为是一种环保且经济高效的改性方法。在本研究中，对竹子进行了饱和蒸汽处理，并通过湿化学法、傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、X射线衍射（XRD）、纳米压痕等方法分析了其化学成分、纤维素结晶度指数、微观形态和微观力学性能的变化。结果表明，由于竹子样品中半纤维素和纤维素的分解，薄壁细胞壁发生了扭曲。正如预期的那样，半纤维素和纤维素含量降低，而木质素含量显著增加。此外，竹子细胞壁的纤维素结晶度指数以及微观力学性能有所提高。例如，由于结晶度指数和木质素含量的提高，硬度从0.69 GPa增加到了0.84 GPa。
