Polylactic acid/Lignocellulosic residue composites compatibilized through a starch coating

Autor(es)

Rocha, Daniel Belchior ^[1] ; de Souza, Alana Gabrieli ^[1] ; Szostak, Marek ^[2] ; Rosa, Derval dos Santos ^[1]

Afiliação do(s) autor(es)

^[1] Fed Univ ABC, Lab Polimeros Ambientalmente Amigaveis, Ave Estados 5001, Santo Andre 09210580, SP - Brazil

^[2] Poznan Univ Tech, Inst Mat Technol, Polymer Proc Div, Poznan - Poland

• Tipo de documento: Artigo Científico
• Fonte: Polymer Composites; v. 41, n. 8 MAY 2020.
• Citações Web of Science: 0

Resumo

The use of natural fiber residues as reinforcement in biodegradable composites has been performed; however, the incompatible interface limits the applications. In this work, the use of starch coating as a natural coupling agent was studied in three different natural residues: sugarcane bagasse, macaranduba, and pinus wastes, aiming biodegradable composites. The coating in bagasse showed low efficiency, with low thickness and failures, due to residue intrinsic higher surface area; while the wood residues showed shorter fibers with uniform starch deposition. These results affected the compatibility between filler and matrix; while the bagasse composite showed voids and decrease in the mechanical properties; however, the macaranduba and pinus showed an increase in the stiffness and strength. All the coated fiber composites showed stable thermal properties and an increase in the crystallinity in the coated samples. The addition of the natural filler resulted in a high water absorption with coated samples absorbing six times more water than neat PLA and without stabilization in a short time. This characteristic may favor the initial abiotic hydrolysis in the biodegradation, showing that the material could be an option to produce short-life packaging in dry environments. (AU)

• Processo FAPESP: 18/21831-1 - Avaliação do efeito de compatibilização da goma de amido em compósitos de fibras naturais e matrizes poliméricas
• Beneficiário: Derval dos Santos Rosa
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional
• 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