Plasticized poly(lactic acid) reinforced with antioxidant covalent organic frameworks (COFs) as novel nanofillers designed for non-migrating active packaging applications

A 2D Covalent Organic Framework (named [HC≡C]0.5-TPB-DMTP-COF) was synthesized and post synthetically functionalized with dopamine via Copper-catalyzed azide–alkyne cycloaddition (CuAAC) reaction (COFDOPA) to obtain 2D nanoparticles with antioxidant activity. COFDOPA nanoparticles were exfoliated in...

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Bibliographic Details
Published in:Polymer (Guilford) 2020-05, Vol.196, p.122466, Article 122466
Main Authors: García-Arroyo, Paloma, Arrieta, Marina P., Garcia-Garcia, Daniel, Cuervo-Rodríguez, Rocío, Fombuena, Vicent, Mancheño, María J., Segura, José L.
Format: Article
Language:English
Subjects:
Alkynes
Antioxidants
Citric acid
Covalent organic frameworks
Cycloaddition
Dopamine
Food
Food packaging
Mechanical properties
Nanoparticles
Non-migration antioxidant activity
Packaging materials
poly(lactic acid)
Polylactic acid
Sustainable packaging
Thermodynamic properties
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Summary:A 2D Covalent Organic Framework (named [HC≡C]0.5-TPB-DMTP-COF) was synthesized and post synthetically functionalized with dopamine via Copper-catalyzed azide–alkyne cycloaddition (CuAAC) reaction (COFDOPA) to obtain 2D nanoparticles with antioxidant activity. COFDOPA nanoparticles were exfoliated into nanosheets (COFDOPA-e) and incorporated into plasticized poly(lactic acid) (PLA) matrix with 15 wt% of acetyl trybutyl citrate (ATBC) to develop non-migratory sustainable packaging. The effect of COFDOPA and exfoliated COFDOPA-e (in 0.5, 1 and 3 wt%) on the structural, thermal and mechanical properties of PLA-ATBC was studied. The bionanocomposites loaded with low amounts of COFDOPA-e (0.5 wt% and 1 wt%) resulted optically transparent and showed good interfacial adhesion, increased crystallinity, thermal and mechanical performance. Moreover, the overall migration level assayed in a fatty food simulant was below the migration limits required for food packaging materials and showed effective antioxidant activity. Thus, these bionanocomposites show great potential as non-migration antioxidant materials with interest in the sustainable food packaging field. [Display omitted] •An imine-based covalent organic framework was synthesized and functionalized with dopamine as antioxidant agent (COFDOPA) via click chemistry.•Antioxidant COFDOPA was exfoliated into COFDOPA-e nanosheets and incorporated into plasticized PLA to obtain non-migrating bionanocomposites.•Low amounts of exfoliated COFDOPA-e (0.5 wt% and 1 wt%) improved the mechanical and thermal performance of plasticized PLA.•Bionanocomposites loaded with low amounts of COFDOPA-e (0.5 wt% and 1 wt%) showed their effectiveness as non-migrating antioxidant materials.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2020.122466