Composite films of ecofriendly lignocellulosic nanostructures in biodegradable polymeric matrix

Autor(es)

Bauli, Clara R. ^[1] ; Rocha, Daniel B. ^[1] ; Rosa, Derval dos Santos ^[1]

Afiliação do(s) autor(es)

^[1] Fed Univ ABC UFABC, Engn Modeling & Appl Social Sci Ctr CECS, Environm Friendly Polymers Lab, Av Estados 5001, BR-09210580 Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SN APPLIED SCIENCES; v. 1, n. 7 JUL 2019.
• Citações Web of Science: 0

Resumo

Cellulose nanostructures (CNS) are an alternative for reinforcement of biodegradable polymers. However, the usual process applied to obtain them is environmentally harmful, generating chemical wastes, mostly in the lignin removal process. In this work, bionanocomposites reinforced with CNS were obtained using a process with lower environmental impact, viz. enzymatic hydrolysis of Pinus wood, with or without alkaline pretreatment for lignin removal. They were then incorporated into poly(butylene adipate-co-terephthalate) (PBAT) at 1%, 3%, and 5% (wt./wt.) by a solvent casting process with a nonionic surfactant as surface modification agent. The properties of the obtained composites indicated that pretreatment for lignin removal was not necessary to improve the mechanical properties. The isolated nature of the CNS led to a better distribution in the casting process and similar mechanical properties, with an increase in the Young's modulus by 16%. Addition of the surfactant helped improve the dispersion of the reinforcement but did not affect the mechanical properties. The interaction with water was affected by the addition of surfactant, which resulted in a hydrophilic composite and influenced its post-use degradation. The results of this work confirm that it is possible to produce CNS composites without excessive consumption of reagents and that their properties can be modified for use in different packaging applications. (AU)

• Processo FAPESP: 16/12700-5 - Obtenção de nanocristais de celulose utilizando resíduos de madeira por métodos enzimáticos
• Beneficiário: Clara Rodrigues Bauli
• Linha de fomento: Bolsas no Brasil - Iniciação Científica
• 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
• Linha de fomento: Auxílio à Pesquisa - Regular