151979 20251017144624.0 doi 10.3390/polym13203531 sideral 126527 ART-2021-126527 eng Candal, M.V. Structure and properties of reactively extruded opaque post-consumer recycled PET 2021 Access copy available to the general public Unrestricted The recyclability of opaque PET, which contains TiO2 nanoparticles, has not been as well-studied as that of transparent PET. The objective of this work is to recycle post-consumer opaque PET through reactive extrusion with Joncryl. The effect of the reactive extrusion process on the molecular structure and on the thermal/mechanical/rheological properties of recycling post-consumer opaque PET (r-PET) has been analyzed. A 1% w/w Joncryl addition caused a moderate increase in the molecular weight. A moderate increase in chain length could not explain a decrease in the overall crystallization rate. This result is probably due to the presence of branches interrupting the crystallizable sequences in reactive extruded r-PET (REX-r-PET). A rheological investigation performed by SAOS/LAOS/elongational studies detected important structural modifications in REX-r-PET with respect to linear r-PET or a reference virgin PET. REX-r-PET is characterized by a slow relaxation process with enlarged elastic behaviors that are characteristic of a long-chain branched material. The mechanical properties of REX-r-PET increased because of the addition of the chain extender without a significant loss of elongation at the break. The reactive extrusion process is a suitable way to recycle opaque PET into a material with enhanced rheological properties (thanks to the production of a chain extension and long-chain branches) with mechanical properties that are comparable to those of a typical virgin PET sample. info:eu-repo/grantAgreement/EUR/INTERREG POCTEFA-RevalPET'UP-EFA329/19 info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es 4.967 2021 POLYMER SCIENCE 16 / 90 = 0.178 2021 Q1 T1 0.726 2021 Polymers and Plastics 2021 Q1 Chemistry (miscellaneous) 2021 Q1 5.7 2021 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Safari, M. Fernández, M. Otaegi, I. Múgica, A. Zubitur, M. Gerrica-Echevarria, G. Sebastián, V. Universidad de Zaragoza (orcid)0000-0002-6873-5244 Irusta, S. Universidad de Zaragoza (orcid)0000-0002-2966-9088 Loaeza, D. Maspoch, M.L. Santana, O.O. Müller, A.J. 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 5005 790 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Tecnologi. Medio Ambiente 13, 20 (2021), 3531 [30 pp.] Polymers (Basel) Polymers 2073-4360 8326749 http://zaguan.unizar.es/record/151979/files/texto_completo.pdf Versión publicada 2797843 http://zaguan.unizar.es/record/151979/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:151979 articulos driver 2025-10-17-14:23:08 ARTICLE