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Polymers 2018, 10(3), 278; https://doi.org/10.3390/polym10030278

Effect of Cationic Surface Modification on the Rheological Behavior and Microstructure of Nanocrystalline Cellulose

1
National Engineering Laboratory of Textile Fiber Materials and Processing Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China
2
Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510070, China
3
Hangzhou Project & Research Institute of Electro-Mechanic in Light Industry, Hangzhou 310004, China
4
Shanghai Tonnor Material Science Co., Ltd., Shanghai 200092, China
*
Author to whom correspondence should be addressed.
Received: 4 February 2018 / Revised: 23 February 2018 / Accepted: 5 March 2018 / Published: 7 March 2018
(This article belongs to the Special Issue Surface Modification and Functional Coatings for Polymers)
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Abstract

In the present work, the microstructure and rheological behavior of nanocrystalline cellulose (NCC) and cationically modified NCC (CNCC) were comparatively studied. The resultant CNCC generally showed improved dispersion and higher thermal stability in comparison to the un-modified NCC. The rheological behavior demonstrated that the viscosity of the NCC suspension substantially decreased with the increasing shear rate (0.01–100 s−1), showing the typical characteristics of a pseudoplastic fluid. In contrast, the CNCC suspensions displayed a typical three-region behavior, regardless of changes in pH, temperature, and concentration. Moreover, the CNCC suspensions exhibited higher shear stress and viscosity at a given shear rate (0.01–100 s−1) than the NCC suspension. Meanwhile, the dynamic viscoelasticity measurements revealed that the CNCC suspensions possessed a higher elastic (G′) and loss modulus (G″) than NCC suspensions over the whole frequency range (0.1–500 rad·s−1), providing evidence that the surface cationization of NCC makes it prone to behave as a gel-like structure. View Full-Text
Keywords: nanocrystalline cellulose; cationic modification; rheological behavior; microstructure nanocrystalline cellulose; cationic modification; rheological behavior; microstructure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Tang, Y.; Wang, X.; Huang, B.; Wang, Z.; Zhang, N. Effect of Cationic Surface Modification on the Rheological Behavior and Microstructure of Nanocrystalline Cellulose. Polymers 2018, 10, 278.

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