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RESEARCH PRODUCT

Bilayer biodegradable films prepared by co-extrusion film blowing: Mechanical performance, release kinetics of an antimicrobial agent and hydrolytic degradation

Andrea MaioFortunato Emmanuel GulinoAlessia ArcarisiClaudio Di SalvoRoberto Scaffaro

subject

D. Mechanical testingMaterials scienceKinetics02 engineering and technology010402 general chemistry01 natural sciencesE. Extrusion.law.inventionchemistry.chemical_compoundMagazinePolylactic acidlawMonolayerB. Environmental degradationComposite materialBilayerAdhesion021001 nanoscience & nanotechnology0104 chemical sciencesSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiChemical engineeringchemistryMechanics of MaterialsA. Multifunctional compositeCeramics and CompositesDegradation (geology)0210 nano-technologyLayer (electronics)

description

Abstract Bilayer biodegradable, eco-friendly films were prepared by co-extrusion film blowing, coupling polylactic acid (PLA) and Bio-flex ® (BIO). Furthermore, in the PLA layer, carvacrol (CRV) was added as a natural antimicrobial additive, whereas a nanoclay (D72T) was integrated to protect CRV from volatilization and to modulate release. The materials were analyzed by morphological, chemical-physical, mechanical testing. Furthermore, CRV release and degradation tests were performed. The results pointed out that coupling the two matrices allows gathering the stiffness of PLA with the ductility of BIO. Furthermore, the interlayer adhesion is promoted by CRV. D72T exerts a key-role in avoiding CRV volatilization, thus allowing more prolonged release. Degradation tests results highlight that bilayer films, while being particularly resistant in both acidic and neutral environments, showed a rapid degradation under alkaline conditions, which proved to be intermediate between those of the corresponding monolayers.

yearjournalcountryeditionlanguage
2020-05-01Composites Part A: Applied Science and Manufacturing
https://doi.org/10.1016/j.compositesa.2020.105836