Department of Materials Science and Engineering-1, General Materials Properties, University of Erlangen-Nuremberg, Martensstrasse 5, D-91058 Erlangen, Germany.
Acta Biomater. 2010 Nov;6(11):4345-51. doi: 10.1016/j.actbio.2010.05.026. Epub 2010 Jun 1.
Pyrolytic conversion causes severe changes in the microstructure of the wood cell wall. Pine wood pyrolysed up to 325 °C was investigated by transmission electron microscopy, atomic force microscopy and nanoindentation measurements to monitor changes in structure and mechanical properties. Latewood cell walls were tested in the axial, radial and tangential directions at different temperatures of pyrolysis. A strong anisotropy of elastic properties in the native cell wall was found. Loss of the hierarchical structure of the cell wall due to pyrolysis resulted in elastic isotropy at 300 °C. The development of the mechanical properties with increasing temperature can be explained by alterations in the structure and it was found that the elastic properties were clearly related to length and orientation of the microfibrils.
热解转化会导致木材细胞壁的微观结构发生剧烈变化。利用透射电子显微镜、原子力显微镜和纳米压痕测量对 325°C 以下的热解松木进行了研究，以监测结构和机械性能的变化。在不同的热解温度下，对晚材细胞壁进行了轴向、径向和切向测试。在天然细胞壁中发现了强烈的各向异性弹性性能。由于热解导致细胞壁的层次结构丧失，在 300°C 时导致弹性各向同性。随着温度的升高，机械性能的发展可以通过结构的改变来解释，并且发现弹性性能与微纤维的长度和取向明显相关。
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