Cellulose nanocrystals from curaua fibers and poly[ethylene‐co‐(vinyl acetate)] nanocomposites: Effect of drying process of CNCs on thermal and mechanical properties

Poly[ethylene‐co‐(vinyl acetate)] (EVA) and cellulose nanocrystals (CNCs) from curaua fibers were used to obtain nanocomposites. Due to polarity that acetate groups promote in EVA, they tend to present better affinity with cellulose nanostructures without compatibilizers. In addition, the influence...

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Bibliographic Details
Published in:Polymer composites 2020-05, Vol.41 (5), p.1736-1748
Main Authors: Corrêa, Ana Carolina, Teodoro, Kelcilene Bruna Ricardo, Simão, José Alexandre, Claro, Pedro Ivo Cunha, Morais Teixeira, Eliangela, Mattoso, Luiz Henrique Capparelli, Marconcini, José Manoel
Format: Article
Language:English
Subjects:
Cellulose
Cellulose acetate
Cellulose fibers
cellulose nanocrystals
Compatibilizers
curaua
Dispersion
drying effect
Drying ovens
Elongation
Ethylene vinyl acetates
EVA
Mechanical properties
Modulus of elasticity
Nanocomposites
Nanocrystals
Polarity
Thermodynamic properties
Vinyl acetate
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Summary:Poly[ethylene‐co‐(vinyl acetate)] (EVA) and cellulose nanocrystals (CNCs) from curaua fibers were used to obtain nanocomposites. Due to polarity that acetate groups promote in EVA, they tend to present better affinity with cellulose nanostructures without compatibilizers. In addition, the influence of the drying conditions of CNCs suspension on their dispersion through the matrix was also evaluated. CNCs were obtained via acid hydrolysis in a mixture of sulfuric 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 were incorporated into EVA at concentrations of 1, 3, and 5 wt% of each CNCs. The compositions were processed in a corotating twin‐screw extruder and injection molded. Morphological results showed better dispersion and adhesion of freeze‐dried nanocrystals into EVA, and these nanocomposites also presented increase in elastic modulus and elongation at break, resulting in more resilient and elastic materials.
ISSN:0272-8397
1548-0569
DOI:10.1002/pc.25493