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

Autor(es)

de Souza, Alana G. ^[1] ; Junqueira, Mariana T. ^[1] ; de Lima, Giovanni F. ^[1] ; Rangari, Vijaya K. ^[2] ; Rosa, Derval S. ^[1]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF POLYMERS AND THE ENVIRONMENT; v. 28, n. 4 FEB 2020.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 18/25239-0 - Evolução da dispersão de nanoestruturas de celulose modificadas aplicadas em bionanocompósitos
• Beneficiário: Derval dos Santos Rosa
• Modalidade de apoio: Bolsas no Exterior - Pesquisa
• Processo FAPESP: 18/11277-7 - Filmes de PBAT com nanoestruturas de celulose tratadas com óleos essenciais encapsulados para embalagens ativas
• Beneficiário: Derval dos Santos Rosa
• Modalidade de apoio: Auxílio à Pesquisa - Regular