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Relationship between rheological and morphological characteristics of cellulose nanofibrils in dilute dispersions
Universidad de Concepción, Chile.
Universidad de Concepción, Chile.
Universidad de Concepción, Chile.
RISE - Research Institutes of Sweden, Bioeconomy, PFI.ORCID iD: 0000-0002-6183-2017
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2019 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, article id 115588Article in journal (Refereed) Published
Abstract [en]

The morphology of cellulose nanofibrils (CNFs), the rheological characteristics of their dispersions, and the corresponding relationships, are fundamental for understanding the properties of the material. This work aims at understanding how the morphological characteristics of the CNFs affect the rheology of the dispersions in the dilute region and to establish a relationship between both properties. A strong relationship was observed between the intrinsic viscosity of the CNF dispersions and their aspect ratio, which can be correlated through the expression ρ[η]=0.051p1.85. When comparing the model obtained in this work to the wormlike chain model, it was possible to verify that these models are independent of the flexibility of the CNFs. Regarding the fibrillation process, the dynamic viscosity only reflects part of the behavior of the morphological properties of the CNFs and does not provide reliable data that would allow these characteristics to be inferred, while the intrinsic viscosity does allow this relationship. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2019. article id 115588
Keywords [en]
Aspect ratio, Cellulose nanofibrils, Intrinsic viscosity, Morphology, Rheology
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-42080DOI: 10.1016/j.carbpol.2019.115588Scopus ID: 2-s2.0-85075840651OAI: oai:DiVA.org:ri-42080DiVA, id: diva2:1379203
Note

Funding details: CONICYT/FONDAP/15130015, AFB170001; Funding text 1: We thank Innova Chile, Santiago, Chile (project 17COTE-72514), UDT (project CONICYT PIA/APOYO CCTE AFB170007), and the ASIF laboratory (Department of Chemical Engineering, University of Concepcion). FB acknowledges the support of CONICYT/PIA/Concurso Apoyo a Centros Científicos y Tecnológicos de Excelencia con Financiamiento Basal AFB170001 and CRHIAM , project CONICYT/FONDAP/15130015. Appendix A

Available from: 2019-12-16 Created: 2019-12-16 Last updated: 2019-12-16Bibliographically approved

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Chinga-Carrasco, Gary

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