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Exploring the gelation of aqueous cellulose nanocrystals (CNCs)-hydroxyethyl cellulose (HEC) mixtures

Rheologica acta, 2021-09, Vol.60 (9), p.483-495 [Peer Reviewed Journal]

The Author(s) 2021 ;The Author(s) 2021. ;The Author(s) 2021. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 0035-4511 ;EISSN: 1435-1528 ;DOI: 10.1007/s00397-021-01285-1 ;PMID: 34720210

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Title:
Exploring the gelation of aqueous cellulose nanocrystals (CNCs)-hydroxyethyl cellulose (HEC) mixtures
Author: Stolz, Jonathan ; Oguzlu, Hale ; Khalili, Zahra ; Boluk, Yaman
Subjects: Amplitudes ; Cellulose ; Characterization and Evaluation of Materials ; Chemistry and Materials Science ; Complex Fluids and Microfluidics ; Food Science ; Gelation ; Gels ; Hydroxyethyl celluloses ; Materials Science ; Mechanical Engineering ; Nanocrystals ; Original Contribution ; Phase diagrams ; Polymer Sciences ; Shear ; Shear thinning (liquids) ; Soft and Granular Matter ; Stiffening ; Wood pulp
Is Part Of: Rheologica acta, 2021-09, Vol.60 (9), p.483-495
Description: We investigated the gelation and microstructure of cellulose nanocrystals (CNCs) in nonionic hydroxyethyl cellulose (HEC) solutions. Cellulose nanocrystals (CNCs) with a particle length of 90 nm and width of 8 nm currently produced by acid hydrolysis of wood pulp were used in this study. The microstructures of CNCs/polymer suspensions were investigated by performing linear small amplitude oscillatory shear (SAOS) and nonlinear large amplitude oscillatory shear (LAOS), in addition to constructing CNCs phase diagrams and measuring steady-state shear viscosities. Significant viscosity increases at low shear rates coupled with high shear thinning behaviors were observed in CNCs in HEC solutions above the overlapping concentration of HEC. The physical strength of CNCs/HEC solution gels increased with the increase in CNCs concentration and resembled the weakly crosslinked gels according to the scaling of linear dynamic mechanical experiments. According to LAOS analysis, CNCs/HEC mixtures showed type III behavior with intercycle stress softening, while the samples showed stress stiffening in single cycles. Graphical abstract
Publisher: Berlin/Heidelberg: Springer Berlin Heidelberg
Language: English
Identifier: ISSN: 0035-4511
EISSN: 1435-1528
DOI: 10.1007/s00397-021-01285-1
PMID: 34720210
Source: Springer Nature OA/Free Journals
ProQuest Central

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Exploring the gelation of aqueous cellulose nanocrystals (CNCs)-hydroxyethyl cellulose (HEC) mixtures

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