Journal
POLYMERS
Volume 10, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/polym10030278
Keywords
nanocrystalline cellulose; cationic modification; rheological behavior; microstructure
Categories
Funding
- Zhejiang Provincial Natural Science Foundation of China [LY14C160003]
- National Natural Science Foundation of China [31100442]
- Public Projects of Zhejiang Province [2016C31075, 2017C31059]
- Zhejiang Provincial Top Key Academic Discipline of Chemical Engineering, Technology, Zhejiang Open Foundation of the Most Important Subjects [2016KF01]
- 521 Talent Cultivation Program of Zhejiang Sci-Tech University [11110132521310]
- Open Foundation of Key Laboratory of Renewable Energy, Chinese Academy of Sciences [Y607s11001]
- Science and Technology Projects of Hangzhou City [20150533B83]
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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.
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