RT journal article
T1 Supercritical Impregnation of PETG with Olea europaea Leaf Extract: Influence of Operational Parameters on Expansion Degree, Antioxidant and Mechanical Properties
A1 Machado,  Noelia Daiana
A1 Mosquera, J.E.
A1 Cejudo Bastante, Cristina
A1 Goñi, M.L.
A1 Martini, R.E.
A1 Gañán, N.A.
A1 Mantell Serrano, Casimiro
A1 Casas Cardoso, Lourdes
A2 Ingeniería Química y Tecnología de Alimentos
K1 Polyethylene terephthalate glycol
K1 Olea europaea leaf extract
K1 Mechanical properties
K1 Antioxidant loading
K1 Expansion degree
AB PETG (poly(ethylene glycol-co-cyclohexane-1,4-dimethanol terephthalate)) is an amorphouscopolymer, biocompatible, recyclable, and versatile. Nowadays, it is being actively researched forbiomedical applications. However, proposals of PETG as a platform for the loading of bioactivecompounds from natural extract are scarce, as well as the effect of the supercritical impregnationon this polymer. In this work, the supercritical impregnation of PETG filaments with Olea europaealeaf extract was investigated, evaluating the effect of pressure (100–400 bar), temperature (35–55 ◦C),and depressurization rate (5–50 bar min−1) on the expansion degree, antioxidant activity, andmechanical properties of the resulting filaments. PETG expansion degree ranged from ~3 to 120%,with antioxidant loading ranging from 2.28 to 17.96 g per 100 g of polymer, corresponding to oxidationinhibition values of 7.65 and 66.55%, respectively. The temperature and the binary interaction betweenpressure and depressurization rate most affected these properties. The mechanical properties ofPETG filaments depended greatly on process variables. Tensile strength values were similar or lowerthan the untreated filaments. Young’s modulus and elongation at break values decreased below~1000 MPa and ~10%, respectively, after the scCO2 treatment and impregnation. The extent of thisdecrease depended on the supercritical operational parameters. Therefore, filaments with higherantioxidant activity and different expansion degrees and mechanical properties were obtained byadjusting the supercritical processing conditions.
PB Multidisciplinary Digital Publishing Institute (MDPI)
SN 2073-4360
YR 2024
FD 2024
LK http://hdl.handle.net/10498/33655
UL http://hdl.handle.net/10498/33655
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 21-sep-2026