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The influence of the multi-level structure under high drawing on the preparation of high strength Lyocell fiber

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Abstract

In order to research the multi-level structure of Lyocell fiber at different draw ratios and to reveal the limiting factors for preparing the high strength Lyocell fiber, the paper reports on the effect of draw ratio including low drawing (1–5), high drawing (6–11) and excessive drawing (12–20) on the multi-level structure and the mechanical properties of Lyocell fiber. The structure was determined by wide-angle X-ray diffraction, small-angle X-ray scattering and fibrillation test, and the result showed that, at low draw ratio stage, the breaking strength, yield strength and modulus of the fiber increased with the draw ratio owing to crystallinity as well as orientation increased while the micropore decreased, and there were almost no microfibrils on the fiber surface. At high draw ratio stage, the orientation of amorphous region increasing was the principal reason for the increase of fiber mechanical properties, and the micropores continued to decrease and a few short and thick microfibril was formed. At excessive draw ratio stage, the breaking strength remained constant mainly due to the basically unchanged crystallinity and orientation of the fibers, the yield strength and modulus decreased due to the slip of the highly crystallized and oriented elementary fibril. Meanwhile, the micropores still decreased and became more slender, the number of microfibrils increased and the microfibrils showed tenuous structure. It can be summarized that Lyocell fiber has the characteristics of multi-level structure, and the fundamental reason limiting the improvement of mechanical properties with draw ratio increasing is the slip of elementary fibril.

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Acknowledgments

Thanks for the support of the National Natural Science Foundation of China (51773032) and the help of Shanghai Synchrotron Radiation Facility (SSRF).

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Authors and Affiliations

  1. College of Materials Science and Engineering, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai, 201620, China

    Shiqiang Cui, Yang Zhang, Yue Zhang, Yumei Zhang & Huaping Wang

  2. Chtc Helon (Weifang) New Materials Co., Ltd., Weifang, 261000, Shandong Province, China

    Changjun Liu & Shanhao Lou

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  1. Shiqiang Cui
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  2. Yang Zhang
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  3. Changjun Liu
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  4. Shanhao Lou
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  5. Yue Zhang
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  6. Yumei Zhang
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  7. Huaping Wang
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Correspondence to Yue Zhang or Yumei Zhang.

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Cui, S., Zhang, Y., Liu, C. et al. The influence of the multi-level structure under high drawing on the preparation of high strength Lyocell fiber. Cellulose 29, 751–762 (2022). https://doi.org/10.1007/s10570-021-04364-x

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