木质素
流变学
纤维素
纤维
材料科学
纳米纤维
形态学(生物学)
粘度
化学工程
复合材料
化学
有机化学
生物化学
遗传学
生物
工程类
作者
Tianzhong Yuan,Jinsong Zeng,Bin Wang,Zheng Cheng,Kefu Chen
标识
DOI:10.1016/j.carbpol.2020.117441
摘要
This study aims to investigate the relationship between lignin content, morphology, and rheology of lignin containing cellulose nanofibers (LCNFs). The morphology and rheology of LCNFs were dominated by lignin content. Lignin content had two-sides on mechanical fibrillation. At high lignin content (23.79 %), reduced efficiency of defibrillation resulted in large LCNFs connecting with lignin patches. LCNF suspensions exhibited low viscosity, weak gel behavior due to infirm fibril network. Small yield stress of 1.14 Pa suggested that fibril network was easily disrupted. At residual lignin of 6.52 %, fibril bundles were sensitive to defibrillation, producing long and flexible LCNFs with high capacity of entanglement. The entangled fibril network had high viscosity and strong gel like behavior. Creep compliance of 0.09 Pa−1 and large yield stress of 4.25 Pa indicated excellent resistance to deformation. The desired rheology can be tailored by lignin content, providing practical guidance on novel rheology-dependent LCNF based materials.
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