RT info:eu-repo/semantics/article
T1 Upcycling post-consumer PET bottles into low-density films and 3D-printed materials
A1 Merillas, M.
A1 Lledó Martín, Jaime
A1 Santiago Calvo, M
A1 Matesanz Niño, Laura
A1 Martín de León, Judit
A1 Merino, J.C.
A1 Rodríguez Pérez, M.A. .
K1 Recycled polyethylene terephthalate
K1 3D printing
K1 Foaming
AB Recycled polyethylene terephthalate (rPET) from mixed-color bottle waste is typically downcycled due to its variable composition and reduced melt strength, limiting their contribution to circular economy strategies and high-value applications. In this work it is proved that gas dissolution foaming enables the upcycling of two industrial rPET, light-blue PET (PET_B) and color recycled PET (PET_C) into low-density microcellular films and 3D printed-parts. A comprehensive materials characterization allows to establish the optimum processing window for these materials. This way optimized microcellular structures were produced at mild saturation conditions (15 MPa, 50 °C). PET_B shows cell sizes close to 2 μm together with relative densities of 0.2 to 0.28, outperforming virgin PET. PET_C, despite containing several non-miscible contaminants, also leads to stable cellular materials with cell sizes from 5 to 18 μm. Finally, we demonstrate for the first time that rPET 3D-printed components can be foamed while preserving their overall geometry, undergoing a controlled volumetric expansion and achieving a 40% density reduction with homogeneous microcellular structure. Overall, this study highlights the potential of gas dissolution foaming as a robust upcycling route for heterogeneous PET waste streams, enabling lightweight materials and supporting circular manufacturing strategies.
PB Elsevier
SN 2589-2347
YR 2026
FD 2026
LK https://uvadoc.uva.es/handle/10324/83925
UL https://uvadoc.uva.es/handle/10324/83925
LA eng
NO Materials Today Sustainability, 2026, vol. 34, p. 101352
NO Producción Científica
DS UVaDOC
RD 09-abr-2026