A Comparative Study on the Characterization of Nanofibers with Cellulose I, I/II, and II Polymorphs from Wood
A Comparative Study on the Characterization of Nanofibers with Cellulose I, I/II, and II Polymorphs from Wood
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木材中纤维素 I、I/II 和 II 多晶型物纳米纤维表征的比较研究
DOI：
10.3390/polym11010153
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发表时间：
2019-01
期刊：
影响因子：
5
通讯作者：
Li Dagang
中科院分区：
文献类型：
--
作者：
Wang Haiying;Li Suiyi;Wu Tiantian;Wang Xiaoxuan;Cheng Xudong;Li Dagang
纤维素纳米纤维（CNF）的多晶型变化与其性能和应用密切相关，研究多晶型变化如何影响其性能是很有意义的。本文对 CNF 与木材纤维素 I、I/II 和 II 多晶型物的性能进行了比较研究。 CNF 是通过化学提取结合简单高效的机械处理（一次通过研磨机）获得的。经过简单的研磨处理后，该工艺的产率相对较高，可达 80-85%。对CNF的多晶型变化以及化学成分、形态、拉伸性能和热性能进行了系统的表征和比较。 X 射线衍射和 FTIR 分析证实了三种类型的纯化纸浆和具有纤维素 I、纤维素 I/II 和纤维素 II 多晶型物（CNF-I、CNF-I/II、CNF-II）的 CNF 的存在。形态学观察表明，这三种类型的 CNF 均表现出高纵横比和缠结结构。拉伸测试表明，CNF薄膜均表现出较高的拉伸强度，且CNF-I/II（11.8%）和CNF-II（13.0%）薄膜的断裂应变较CNF-I薄膜（6.0%）显着增加。如果使用CNF-II作为增强材料，其较大的断裂应变可以提高CNF复合材料的力学性能，如断裂韧性和冲击强度。此外，CNF-I、CNF-I/II 和 CNF-II 薄膜在 20-150 °C 范围内表现出非常低的热膨胀，热膨胀系数值分别为 9.4、17.1 和 17.3 ppm/K。热重分析（TGA）显示，CNF-I 和 CNF-II 的降解温度高于 CNF-I/II，这可能是由于 α-纤维素含量增加所致。本研究对CNF-I、CNF-I/II和CNF-II的表征进行比较研究，为不同晶型的CNF的应用提供了理论基础，可以拓宽CNF的应用范围。
Polymorphic changes in cellulose nanofibers (CNFs) are closely related to their properties and applications, and it is of interest to investigate how polymorphic changes influence their properties. A comparative study on the properties of CNFs with cellulose I, I/II, and II polymorphs from wood was conducted herein. CNFs were obtained by chemical extraction combined with a simple and efficient mechanical treatment (one pass through a grinder). This process resulted in a relatively high yield of 80–85% after a simple grinding treatment. The polymorphic changes in the CNFs and the chemical composition, morphology, tensile performances, and thermal properties were systematically characterized and compared. The X-ray diffraction and FTIR analyses verified the existence of three types of purified pulps and CNFs with cellulose I, cellulose I/II, and cellulose II polymorphs (CNF-I, CNF-I/II, CNF-II). Morphological observations presented that these three types of CNFs all exhibited high aspect ratios and entangled structures. Tensile testing showed that the CNF films all exhibited high tensile strengths, and the fracture strains of the CNF-I/II (11.8%) and CNF-II (13.0%) films were noticeably increased compared to those of the CNF-I film (6.0%). If CNF-II is used as reinforcing material, its larger fracture strain can improve the mechanical performance of the CNF composites, such as fracture toughness and impact strength. In addition, CNF-I, CNF-I/II, and CNF-II films showed very low thermal expansion in the range 20–150 °C, with the coefficient of thermal expansion values of 9.4, 17.1, and 17.3 ppm/K, respectively. Thermogravimetric analysis (TGA) revealed that the degradation temperature of CNF-I and CNF-II was greater than that of CNF-I/II, which was likely due to increased α-cellulose content. This comparative study of the characterization of CNF-I, CNF-I/II, and CNF-II provides a theoretical basis for the application of CNFs with different polymorphs and could broaden the applications of CNFs.
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影响因子：
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作者：
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