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Lignin containing cellulose nanofibers (LCNFs): Lignin content-morphology-rheology relationships
Carbohydrate Polymers ( IF 11.2 ) Pub Date : 2020-11-27 , DOI: 10.1016/j.carbpol.2020.117441
Tianzhong Yuan , Jinsong Zeng , Bin Wang , Zheng Cheng , Kefu Chen

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.



中文翻译:

含木质素的纤维素纳米纤维(LCNF):木质素含量-形态-流变关系

这项研究旨在调查木质素含量,形态和含木质素纤维素纳米纤维(LCNFs)流变之间的关系。LCNF的形态和流变学主要由木质素含量决定。木质素含量在机械原纤化方面有两个方面。木质素含量高(23.79%)时,除颤效率降低,导致大型LCNF与木质素斑块连接。LCNF悬浮液由于纤维网薄弱而表现出低粘度,弱凝胶行为。1.14 Pa的小屈服应力表明原纤维网络很容易破坏。在残留木质素为6.52%的情况下,原纤维束对除颤敏感,产生了长而柔软的,具有高缠结能力的LCNF。缠结的原纤维网络具有高粘度和强凝胶样行为。蠕变柔量为0.09 Pa -1屈服应力为4.25 Pa,表明抗变形性极好。可以通过木质素含量调整所需的流变性能,为基于流变学的新型基于LCNF的材料提供实用指导。

更新日期:2020-12-01
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