Yu Yuxiu, Wang Weiku, Liu Yaodong
CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 Taoyuan South Road, Taiyuan 030001, China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
Materials (Basel). 2024 Oct 5;17(19):4886. doi: 10.3390/ma17194886.
This paper investigates the effects of pre-gelation on cellulose dissolved in LiCl/DMAc solutions to enhance the properties of regenerated cellulose materials. This study focuses on characterizing the crystallinity, molecular orientation, and mechanical performance of cellulose fibers and hydrogels prepared with and without pre-gelation treatment. X-ray diffraction (XRD) analysis reveals that crystallinity improvement from 55% in untreated fibers to 59% in fibers pre-gelled for 3 and 7 days, indicating a more ordered arrangement of cellulose chains post-regeneration. Additionally, XRD patterns show improved chain alignment in pre-gelled fibers, as indicated by reduced full width at half the maximum of Azimuthal scans. Mechanical testing demonstrates a 30% increase in tensile strength and a doubling of the compression modulus for pre-gelled fibers compared to untreated fibers. These findings underscore the role of pre-gelation in optimizing cellulose material properties for applications ranging from advanced textiles to biomaterials and sustainable packaging. Future research directions include further exploration of the structural and functional benefits of pre-gelation in cellulose processing and its broader implications in material science and engineering.
本文研究了预凝胶化对溶解于LiCl/DMAc溶液中的纤维素的影响，以提高再生纤维素材料的性能。本研究重点在于表征经过和未经预凝胶化处理制备的纤维素纤维和水凝胶的结晶度、分子取向和机械性能。X射线衍射（XRD）分析表明，结晶度从未经处理的纤维中的55%提高到预凝胶化3天和7天的纤维中的59%，这表明再生后纤维素链的排列更加有序。此外，XRD图谱显示预凝胶化纤维中的链排列有所改善，这通过方位扫描半高宽的减小得以体现。机械测试表明，与未经处理的纤维相比，预凝胶化纤维的拉伸强度提高了30%，压缩模量增加了一倍。这些发现强调了预凝胶化在优化纤维素材料性能方面的作用，这些材料的应用范围涵盖从先进纺织品到生物材料和可持续包装等领域。未来的研究方向包括进一步探索预凝胶化在纤维素加工中的结构和功能优势及其在材料科学与工程中的更广泛意义。
