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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A New Proposal of Preparation of Different Polymorphs of Nanocellulose from Eucalyptus citriodora

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Author(s):
de Souza, Alana G. [1] ; Junqueira, Mariana T. [1] ; de Lima, Giovanni F. [1] ; Rangari, Vijaya K. [2] ; Rosa, Derval S. [1]
Total Authors: 5
Affiliation:
[1] Fed Univ ABC, Engn Modeling & Appl Social Sci Ctr CECS, Ave Estados 5001, BR-09210580 Santo Andre, SP - Brazil
[2] Tuskegee Univ, Dept Mat Sci & Engn, Tuskegee, AL 36088 - USA
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF POLYMERS AND THE ENVIRONMENT; v. 28, n. 4 FEB 2020.
Web of Science Citations: 0
Abstract

Cellulose is a renewable, sustainable, and high available biopolymer; their common form is the type-I polymorph. However, polymorphic changes are associated with different properties and a wide range of applications. In this study, we proposed a new method to prepare polymorphic cellulose nanostructures (CNSs): first, the CNS were isolated, and then the polymorphs were converted. CNS-I (type-I), CNS-II (type-II), and CNS-III (type-III) were successfully obtained, and the structure, crystallinity, superficial characteristic, morphology, and thermal stability were evaluated. The results showed that CNS-II and CNS-III are more amorphous than CNS-I due to the strong reagents used for the polymorphic conversion, which results in a swelling, increased chain spacing, and structural disorganization. This effectively changed the morphology of the CNS, from cellulose nanocrystals from irregular quasi-spherical nanoparticles. The proposed method allows a wide range of applications, from package and nanocomposites with CNS-I due to its high crystallinity and crystal morphology, to drug carrier, food thickener and biomedical products for CNS-II and CNS-III due to its quasi-spherical shape and more amorphous structure. Graphic (AU)

FAPESP's process: 18/25239-0 - Evaluation of dispersion of modified cellulose nanostructures in bionanocomposites
Grantee:Derval dos Santos Rosa
Support Opportunities: Scholarships abroad - Research
FAPESP's process: 18/11277-7 - PBAT films with cellulose nanostructures treated with essential oils encapsulated for active packaging
Grantee:Derval dos Santos Rosa
Support Opportunities: Regular Research Grants