期刊
CELLULOSE
卷 28, 期 12, 页码 7651-7662出版社
SPRINGER
DOI: 10.1007/s10570-021-04034-y
关键词
Cellulosic fiber; Morphological properties; Mechanical fibrillation; Rheological behavior
资金
- Characterization and instrument development of cross-scale nanofiber based on microfluidic technology [2020ZD01]
- National Key R&D Program of China [2017YFB0307902]
- Natural Science Foundation of Guangdong Province [2019A1515010996]
- China Postdoctoral Science Foundation [2019TQ0100, BX20200134]
- Fundamental Research Funds for the Central Universities [2017YFB0307902, 2019MS085]
- Joint Foundation of the Guangdong Natural Science Foundation for Young Scholar [2020A1515110855]
This study investigated the relationship between mechanical fibrillation, morphological properties, and rheological behavior of cellulosic fiber. Increasing mechanical fibrillation resulted in higher aspect ratio and entanglement capacity of the cellulose fibers, leading to a more tangled fiber network structure. This led to higher viscosity and stronger gel-like behavior in the suspension obtained through more mechanical fibrillation.
This study aims to investigate the relationship between mechanical fibrillation, morphological properties, and rheological behavior of cellulosic fiber. Three types of cellulosic fibers were obtained by adjusting mechanical fibrillation, namely squashed cellulose, incompletely nanofibrillated cellulose, and completely nanofibrillated cellulose, respectively. The squashed cellulose with large size and small aspect ratio had low entanglement capacity, thus forming a weak fiber network. The corresponding suspension exhibited low viscosity, weak elastic behavior, small yield stress, and low dynamic stability. An obviously increasing aspect ratio and entanglement capacity were observed with increasing mechanical fibrillation, resulting in entangled fiber network structure. Hence, the cellulosic fiber suspension obtained by more mechanical fibrillation exhibited higher viscosity, stronger gel-like behavior, and bigger yield stress. Moreover, the extremely entangled fiber network structure has better anti-deformation capacity and recovery capacity. We revealed the fundamental insights into the relationship between morphologies and rheological properties of cellulosic fiber, paving the way for designing cellulose-based materials.
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