Outstanding mechanical and thermal properties of PHBV/EVA hybrids by nucleant and plasticizer action of ionic-liquid and graphene derivative

Published: 1 March 2022| Version 2 | DOI: 10.17632/mkkcwhgf5n.2
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Description

Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and poly(ethylene-co-vinyl acetate) (EVA) hybrid materials were prepared by extrusion at different compositions. The ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate and reduced graphene oxide-zinc oxide composite (rGO-ZnO) were used as plasticizer and reinforcement agent, respectively. Differential scanning calorimetry (DSC) analyses showed the increase in crystallinity of the PHBV phase associated with the reduction in melt temperature for the PHBV/EVA hybrids at 50:50 composition. XRD data corroborated these results, indicating a higher crystallinity for the hybrids with rGO-ZnO added at 1.0% content. DSC also showed the better compatibilizing effect at higher content of the composite. It seems evident that the composite had its dispersion favored by the ionic liquid and improved the crystallization behavior with smaller crystallites. As well, tensile tests showed the notable effect of thermal properties on the elongation at break ( = 389.8 %) for the hybrid with the highest composite content. By contrast, for the hybrids with EVA at 75% composition, the reduction in crystallinity for both EVA and PHBV phases was determinant for better deformations. Finally, overall migration tests revealed that the hybrids with PHBV/EVA at 50:50 composition presented migration levels lower than those required by the European legislation for fat food packaging.

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Institutions

Universidade Federal do Rio de Janeiro

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Food Packaging Material

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