Impact of monovalent cations on the rheology of cellulose nanofibrils

被引：0
作者：
Rahmini [1 ]
Juhn S. [2 ]
Seong H.-A. [3 ]
Shin S.-J. [1 ]
机构：
[1] Department of Wood and Paper Science, Chungbuk National University, Cheongju
[2] Nature Costech Inc., Cheongju
[3] Department of Biochemistry, Chungbuk National University, Cheongju
来源：
Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry | 2020年 / 52卷 / 02期
基金：
新加坡国家研究基金会;
关键词：
Ccellulose nanofibrils; Ionic cross-linking; Loss modulus; Monovalent cation; Rheology; Storage modulus;
D O I：
10.7584/JKTAPPI.2020.04.52.2.12
中图分类号：
学科分类号：
摘要：
In this study, we investigated the rheological properties of 1.5% cellulose nanofibril (CNF) with various concentrations of monovalent ions using a rheometer at 2513. Monovalent ions (Na+, K+, and Li+) were used for the ionic crosslinking of CNFs. The shear viscosity, storage moduli (G'), and loss moduli (G") of 1.5% CNFs with various added cations were measured at concentrations of 500, 1,000, 5,000, and 10,000 ppm. The presence of cations in CNFs significantly induced strong hydrogels: As the cation concentration increased from 500 to 10,000 ppm, the viscosity, storage moduli, and loss moduli increased as well. All samples exhibited shear-thinning behavior with a monotonically decreased viscosity and an increased shear rate. Regarding hydrogel strength, we found that Li+>Na+>K+because of the different radii of the cations and interfibrillar bridging on the hydrogels. We concluded that the rheological properties of CNFs with various concentrations of monovalent ions differ depending on the ionic radius and concentration of each cation. Further research is proposed to determine the maximum strengths of hydrogels with added cations. © 2020 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.
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页码：12 / 22
页数：10
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