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Effects of moisture and cellulose fibril angle on the tensile properties of native single Norway spruce wood fibres
Wood Science and Technology ( IF 3.4 ) Pub Date : 2021-07-05 , DOI: 10.1007/s00226-021-01315-4
Nils Horbelt 1 , Luca Bertinetti 1, 2 , Peter Fratzl 1 , Michaela Eder 1 , John W. C. Dunlop 3
Affiliation  

Isolated single wood fibres with cellulose fibril angles from 10 to 43° were tested in microtensile tests under controlled temperature and relative humidity of 5, 50, 75, 90% and in the wet state. This systematic study provides experimental stiffness and strength data, calculated on cell wall cross sections. It has been shown that stiffness reduction with increasing moisture content is more pronounced in fibres with large cellulose fibril angles. Interestingly, stiffness reduction in fibres with low cellulose fibril angles has been observed for the fully hydrated state only. The experimental dataset was fed into a model to determine moisture dependent stiffness of the hemicellulose-lignin-matrix and the stresses acting on the fibrils and the matrix.



中文翻译:

水分和纤维素原纤维角度对挪威云杉原生单纤维拉伸性能的影响

在 5、50、75、90% 的受控温度和 5%、50%、75%、90% 的相对湿度和湿润状态下,在微拉伸试验中测试了纤维素原纤维角度为 10 到 43° 的分离的单木纤维。这项系统研究提供了根据细胞壁横截面计算的实验刚度和强度数据。已经表明,在具有大纤维素原纤维角度的纤维中,随着水分含量的增加,刚度降低更为明显。有趣的是,仅在完全水合状态下观察到具有低纤维素原纤维角度的纤维的刚度降低。将实验数据集输入模型以确定半纤维素-木质素-基质的湿度依赖性刚度以及作用在原纤维和基质上的应力。

更新日期:2021-07-06
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