木质素含量对木材单根纤维拉伸性能的影响

Influence of lignin content on tensile properties of single wood fiber

以杉木木材单根纤维为研究对象,采用3种化学方法不同程度地脱除木质素,在细胞水平上,探讨木质素对木材单根纤维拉伸力学性能的影响。结果表明:在干燥状态下,单根纤维的弹性模量随着木质素含量的减少而降低,但整体降低的程度不大,木质素几乎完全脱除时,单根纤维的弹性模量降低约7%;木质素对单根纤维的拉伸强度和断裂伸长率影响显著,都随着木质素含量的减少而增大。

Chemical components are main factors affecting the mechanical properties of wood fibers.Lignin is one of the main components of wood cell wall and has a critical effect on the mechanical properties of paper pulp,wood fiber based composites.In the study,we carried out tensile tests on single mature latewood tracheids of Chinese Fir（Cunninghamia lancolata（Lamb.） Hook）,and three different de-lignified treatment methods were used to obtain different content of lignin.We applied single-fiber-test to study the effect of lignin content on tensile mechanical properties of single wood fibers at the cellular lever.Results showed that in the dry state,elastic modulus of single fibers decreased with the reduction of lignin content,even the absolute values were not high.The lignin content affected the tensile strength and elongation of single fibers significantly.The tensile strength and elongation of single fibers increased with the reduction of lignin content.