Data/hora: 19/06/2024 04:37:34

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 14/04/2020
Data da última atualização: | 16/08/2022
Autoria: | CORRÊA, A. C.; TEODORO, K. B. R.; SIMÃO, J. A.; CLARO, P. I. C.; TEIXEIRA, E. M.; MATTOSO, L. H. C.; MARCONCINI, J. M.
Afiliação: | LUIZ HENRIQUE CAPPARELLI MATTOSO, CNPDIA; JOSE MANOEL MARCONCINI, CNPDIA.
Título: | Cellulose nanocrystals from curaua fibers and poly [ethylene-co-(vinyl acetate)] nanocomposites: Effect of drying process of CNCs on thermal and mechanical properties.
Ano de publicação: | 2020
Fonte/Imprenta: | Polymer Composites, v. 41, n. 5, 2020.
Páginas: | 1736-1748
DOI: | 10.1002/pc.25493
Idioma: | Inglês
Conteúdo: | Poly[ethylene-co-(vinyl acetate)] (EVA) and cellulose nanocrystals (CNCs)from curaua fibers were used to obtain nanocomposites. Due to polarity thatacetate groups promote in EVA, they tend to present better affinity with cellu-lose nanostructures without compatibilizers. In addition, the influence of thedrying conditions of CNCs suspension on their dispersion through the matrixwas also evaluated. CNCs were obtained via acid hydrolysis in a mixture of sul-furic and hydrochloric acids. Part of CNCs in neutral suspension was freeze-dried and part was dried in an oven with air circulation. The dried CNCs wereincorporated into EVA at concentrations of 1, 3, and 5 wt% of each CNCs. Thecompositions were processed in a corotating twin-screw extruder and injectionmolded. Morphological results showed better dispersion and adhesion offreeze-dried nanocrystals into EVA, and these nanocomposites also presentedincrease in elastic modulus and elongation at break, resulting in more resilientand elastic materials.
Palavras-Chave: | Cellulose nanocrystals; Drying effect; EVA.
Categoria do assunto: | --
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (17511-1) - UPC - AP - DD - PROCI.20/003 -  - 2020/007 - DIS