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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Correa, Ana Carolina [1] ; Ricardo Teodoro, Kelcilene Bruna [2] ; Simao, Jose Alexandre [3] ; Cunha Claro, Pedro Ivo [3] ; Teixeira, Eliangela de Morais [4] ; Capparelli Mattoso, Luiz Henrique [1] ; Marconcini, Jose Manoel [1]
Total Authors: 7
Affiliation:
[1] Embrapa Instrumentat, Nanotechnol Natl Lab Agr LNNA, POB 741, Sao Carlos, SP - Brazil
[2] Fed Univ Sao Carlos UFSCar, Grad Program Chem PPGQ, Sao Carlos, SP - Brazil
[3] Fed Univ Sao Carlos UFSCar, Grad Program Mat Sci & Engn PPGCEM, Sao Carlos, SP - Brazil
[4] Fed Univ Mato Grosso UFMT, Dept Chem, Av Valdon Varjao 6-390, Barra Do Garcas, Mato Grosso - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Polymer Composites; v. 41, n. 5 JAN 2020.
Web of Science Citations: 0
Abstract

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. (AU)

FAPESP's process: 08/03606-9 - Extraction, characterization and chemical modification of nanofibers from renewable sources for reinforcement of polyolefinic resins
Grantee:Luiz Henrique Capparelli Mattoso
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Research Partnership for Technological Innovation (PITE)