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Multiscale structure of cellulose microfibrils in regenerated cellulose fibers
Carbohydrate Polymers ( IF 10.7 ) Pub Date : 2023-10-19 , DOI: 10.1016/j.carbpol.2023.121512
Jiliang Liu 1 , Herbert Sixta 2 , Yu Ogawa 3 , Michael Hummel 2 , Michael Sztucki 1 , Yoshiharu Nishiyama 3 , Manfred Burghammer 1
Affiliation  

Cellulose in solution can be assembled into textile fibers by wet-spinning (Viscose etc.) or dry-jet wet spinning (Lyocell, Ioncell etc.), which leads to significant differences in the mechanical properties of fibers. We use scanning X-ray microdiffraction (SXM) to reveal regenerated fibers having a “skin-core” morphology. The “core” region comprises microfibrils (MFs) with ~100 nm in diameter. The cellulose forms elementary fibrils having a ribbon-like cross sectional shape of about 6 × 2 nm, which are packed into MFs. Our SXM studies demonstrate that MFs within Ioncell fibers are composed of elementary fibrils with homogeneous morphologies. Furthermore, the stacking of cellulose molecular sheets within elementary fibrils of Viscose fibers is preferentially along the 010 direction, while those of Ioncell fibers preferably stack in the 1–10 direction. The better structural regularities and distinct morphologies of elementary fibrils give Ioncell fibers enhanced mechanical properties and a wet strength far superior to those of Viscose fibers.

中文翻译:


再生纤维素纤维中纤维素微纤丝的多尺度结构



溶液中的纤维素可以通过湿纺(粘胶纤维等)或干射湿纺(Lyocell、Ioncell 等)组装成纺织纤维,这会导致纤维的机械性能存在显着差异。我们使用扫描 X 射线微衍射 (SXM) 来揭示具有“皮核”形态的再生纤维。“核心”区域由直径为 ~100 nm 的微原纤维 (MF) 组成。纤维素形成具有约 6 × 2 nm 的带状横截面形状的基本原纤维,它们被包装在 MF 中。我们的 SXM 研究表明,Ioncell 纤维中的 MF 由具有均匀形态的基本原纤维组成。此外,纤维素纤维基本原纤维内纤维素分子片的堆叠优先沿 010 方向堆叠,而 Ioncell 纤维的纤维素分子片最好沿 1-10 方向堆叠。基本原纤维更好的结构规则和独特的形态使 Ioncell 纤维具有增强的机械性能和远优于粘胶纤维的湿强度。
更新日期:2023-10-19
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