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首页> 外文期刊>Holzforschung >Contribution of lignin to the stress transfer in compression wood viewed by tensile FTIR loading
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Contribution of lignin to the stress transfer in compression wood viewed by tensile FTIR loading

机译：Lignin的贡献通过拉伸FTIR负荷观察的压缩木材压力转移

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摘要

To achieve efficient utilization of compression wood (CW), a deeper insight into the molecular interactions is necessary. In particular, the role of lignin in the wood needs to be better understood, especially concerning how lignin contributes to its mechanical properties. For this reason, the properties of CW and normal wood (NW) from Chinese fir (Cunninghamia lanceolata) have been studied on a molecular scale by means of polarized Fourier transform infrared (FTIR) spectroscopy, under both static and dynamic loading conditions. Under static tensile loading, only molecular deformations of cellulose were observed in both CW and NW. No participation of lignin could be detected. In relation to the macroscopic strain, the molecular deformation of the cellulose C-O-C bond was greater in NW than in CW as a reflection of the higher microfibril angle and the lower load taken up by CW. Under dynamic deformation, a larger contribution of the lignin to stress transfer was detected in CW; the molecular deformation of the lignin being highly related to the amplitude of the applied stress. Correlation analysis indicated that there was a direct coupling between lignin and cellulose in CW, but there was no evidence of such a direct coupling in NW.
机译：为了实现压缩木材的高效利用（CW），需要更深入地了解分子相互作用。特别是，需要更好地理解木质素在木材中的作用，特别是关于木质素如何有助于其机械性能。因此，通过偏振傅里叶变换红外（FTIR）光谱，在静态和动态负载条件下，已经研究了来自中国冷杉（Cunninghamia Lanceolata）的CW和正常木材（NW）的性质。在静态拉伸负载下，在CW和NW中仅观察到纤维素的分子变形。无法检测到木质素的参与。关于宏观菌株的关系，纤维素C-O-C键的分子变形在NW中比CW更大，作为更高的微纤维角的反射和CW占用的较低载荷。在动态变形下，在CW中检测到Lignin对应力转移的更大贡献;木质素的分子变形与施加应力的幅度高度相关。相关分析表明，CW中的木质素和纤维素之间存在直接耦合，但是在NW中没有证据表明这种直接耦合。

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  • 来源
    《Holzforschung》 |2020年第5期|459-467|共9页
  • 作者

    Peng Hui; Salmen Lennart; Jiang Jiali; Lu Jianxiong;

  • 作者单位

    Chinese Acad Forestry Hunan Collaborat Innovat Ctr Effect Utilizing Woo Res Inst Wood Ind Beijing 100091 Peoples R China;

    RISE Bioecon Box 5604 S-11486 Stockholm Sweden;

    Chinese Acad Forestry Hunan Collaborat Innovat Ctr Effect Utilizing Woo Res Inst Wood Ind Beijing 100091 Peoples R China;

    Chinese Acad Forestry Hunan Collaborat Innovat Ctr Effect Utilizing Woo Res Inst Wood Ind Beijing 100091 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    cellulose; compression wood; FTIR; lignin; mechanical properties; polymer interaction; softwood;

    机译：纤维素;压缩木质;FTIR;木质素;机械性能;聚合物相互作用;软木;

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