Journal
POLYMERS
Volume 13, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/polym13081288
Keywords
multilayer; biodegradable; polylactic acid; polycaprolactone; electrospinning
Categories
Funding
- FONDECYT REGULAR [1200766]
- Programa de Financiamiento Basal para Centros Cientificos y Tecnologicos de Excelencia Project [FB0807]
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The study presented a trilayer film design to enhance physical properties of polymers and introduce functionality by incorporating active compounds. The effects of PCL layer and the addition of Q and CNC on optical, morphological, thermal, and barrier properties were evaluated. Quercetin release from bi- and trilayer films demonstrated similar profiles with higher values achieved through the addition of CNC.
The design of multilayer systems is an innovative strategy to improve physical properties of biodegradable polymers and introduce functionality to the materials through the incorporation of an active compound into some of these layers. In this work, a trilayer film based on a sandwich of electrospun polycaprolactone (PCL) fibers (PCLe) containing quercetin (Q) and cellulose nanocrystals (CNC) between extruded polylactic acid (PLA) films was designed with the purpose of improving thermal and barrier properties and affording antioxidant activity to packaged foods. PCLe was successfully electrospun onto 70 mu m-thick extruded PLA film followed by the assembling of a third 25 mu m-thick commercial PLA film through hot pressing. Optical, morphological, thermal, and barrier properties were evaluated in order to study the effect of PCL layer and the addition of Q and CNC. Bilayer systems obtained after the electrospinning process of PCL onto PLA film were also evaluated. The release of quercetin from bi- and trilayer films to food simulants was also analyzed. Results evidenced that thermal treatment during thermo-compression melted PCL polymer and resulted in trilayer systems with barrier properties similar to single PLA film. Quercetin release from bi- and trilayer films followed a similar profile, but achieved highest value through the addition of CNC.
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