resumo
The shift towards a circular economy in the plastic sector demands a holistic approach that prioritizes biobased feedstocks, benign synthetic routes and efficient end-of-life recycling. Herein, an integrated green strategy for the synthesis and recycling of poly(hexamethylene 2,5-furandicarboxylate) (PHF) is outlined. Cyclic oligoesters were prepared from biobased precursors via cyclodepolymerization (CDP) and subsequently converted into PHF through the entropically driven-ring opening polymerization (ED-ROP). To minimize processing steps the crude CDP product, containing cyclic and linear oligoesters, was used directly, with linear species acting as initiators. The ROP catalytic activity of non-toxic bismuth-based compounds was compared to traditional tin-based catalysts. Bismuth subsalicylate (BiSS) emerged as the most efficient choice, leading to high molecular weight PHF under mild conditions. These polymers were fully characterized by 1H NMR, FTIR, viscosimetry and XRD techniques and their thermal properties were studied using TGA, DSC, and DMTA methods. The so prepared PHF exhibited excellent thermal stability and high degree of crystallinity. Proof of concept experiments showed that PHF can be chemically recycled via CDP in a relatively short time frame. Altogether, these findings constitute a first step towards the development of a sustainable cradle-to-grave approach for PHF.
autores
Feriel Abid, Paula S.S. Lacerda, Vinícius de Paula, Catarina F. Araújo, Fabio Aricò, Armando J.D. Silvestre, Andreia F. Sousa
nossos autores
Andreia Fernandes de Sousa
Investigador Principal
Armando Jorge Domingues Silvestre
Professor Catedrático
Catarina F. Araújo
Investigador
Feriel Abid
Estudante de doutoramento
Paula Sofia Sarrico Lacerda
Investigador
Vinícius de Paula
Estudante de doutoramentoGrupos
G4 - Materiais Renováveis e Economia Circular
G6 - Materiais Virtuais e Inteligência Artificial
Projectos
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
ABSolEU: closing the loop on ABS plastics recycling (ABSolEU)
Collaboratory for Emerging Technologies, CoLab (EMERGING TECHNOLOGIES)
agradecimentos
This work was carried out within the framework of the CICECO – Aveiro Institute of Materials, under the projects UID/50011/2025 & LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020), financed by national funds through the FCT/MCTES (PIDDAC). The FCT is acknowledged for the research contract to AFS (CEECINSTLA/00002/2022). The University of Aveiro is acknowledged for the PhD scholarship to FA (BD/REIT/11219/2024). PSSL acknowledges Project “Agenda ILLIANCE” [C644919832-00000035 | Project n° 46], financed by PRR – Plano de Recuperação e Resiliência under the Next Generation EU from the European Union for research contract. The European Commission is acknowledged by VP for a doctorate grant, and CFA for a research contract, under Horizon Europe ABSolEU - “Paving the way for an ABS recycling revOLution in the EU” (HORIZON-CL4-2021-RESILIENCE-01-Project: 101058636) HOP ON program. The NMR spectrometers are part of the National NMR Network (PTNMR) and are partially supported by Infrastructure Project N° 022161 (co-financed by FEDER through COMPETE 2020; POCI and PORL and FCT through PIDDAC).