36 documents found, page 1 of 4
Crystal structure of poly(trimethylene 2,5-furandicarboxylate) redux: a new mod...
Araújo, Catarina F.; Pandeirada, Simão V.; Oliveira, Inês M.; Rosa, Guilherme B.; Agostinho, Beatriz; Silvestre, Armando J. D.; Sousa, Andreia F.Poly(trimethylene 2,5-furandicarboxylate) (PTF) is an emergent biobased polymer potentially able to outperform the fossil-based poly(ethylene terephthalate) counterpart. In this work, computational chemistry and vibrational spectroscopy tools are combined to elucidate the conformational preferences of PTF in both crystalline and amorphous regions. This approach departs from previous studies and leads to a new p...
Enhancing plastic waste recycling: evaluating the impact of additives on the en...
Aguiar, Mariana I. S.; Sousa, Andreia F.; Teixeira, Gabriel; Tavares, Ana P. M.; Ferreira, Ana M.; Coutinho, João A. P.While (bio)degradation of polymers is a recognized challenge, the influence of additives on this process remains poorly understood. Their presence in commercial polyethylene (PE) may inhibit the degradation process or complicate the recycling. This study aims to develop an enzymatic degradation process for post-consumer high-density polyethylene (HDPE). The HDPE degradation was performed using laccase from Tram...
Enhancing plastic waste recycling: Evaluating the impact of additives on the en...
Aguiar, Mariana I.S.; Sousa, Andreia F.; Teixeira, Gabriel; Tavares, Ana P.M.; Ferreira, Ana M.; Coutinho, João A. P.While (bio)degradation of polymers is a recognized challenge, the influence of additives on this process remains poorly understood. Their presence in commercial polyethylene (PE) may inhibit the degradation process or complicate the recycling. This study aims to develop an enzymatic degradation process for post-consumer high-density polyethylene (HDPE). The HDPE degradation was performed using laccase from Tram...
Highly Flexible Poly(1,12-dodecylene 5,5'-isopropylidene-bis(ethyl 2-furoate)):...
Zaidi, Sami; Bougarech, Abdelkader; Abid, Majdi; Abid, Souhir; Silvestre, Armando J. D.; Sousa, Andreia F.The continuous search for novel biobased polymers with high-performance properties has highlighted the role of monofuranic-based polyesters as some of the most promising for future plastic industry but has neglected the huge potential for the polymers' innovation, relatively low cost, and synthesis easiness of 5,5'-isopropylidene bis-(ethyl 2-furoate) (DEbF), obtained from the platform chemical, worldwide-produ...
The key role of pretreatment for the one-step and multi-step conversions of Eur...
Kammoun, Maroua; Margellou, Antigoni; Toteva, Vesislava B.; Aladjadjiyan, Anna; Sousa, Andreia F.; Luis, Santiago V.; Garcia-Verdugo, EduardoNowadays, an increased interest from the chemical industry towards the furanic compounds production, renewable molecules alternatives to fossil molecules, which can be transformed into a wide range of chemicals and biopolymers. These molecules are produced following hexose and pentose dehydration. In this context, lignocellulosic biomass, owing to its richness in carbohydrates, notably cellulose and hemicellulo...
Synthetic (bio)degradable polymers - when does recycling fail?
Agostinho, Beatriz; Silvestre, Armando J. D.; Coutinho, João A. P.; Sousa, Andreia F.Given the current environmental crisis caused by polymers, we have seen that it is mandatory to make changes in the way we produce, consume, and, at the downstream, dispose, and manage polymeric materials after use. For applications where recycling might not be the adequate answer, or landfilling is highly likely to occur, (bio)degradable polymers can play an important role. This appraisal acknowledges the most...
Biobased Semi-Crystalline Polyesteramides from 2,5-Furandicarboxylic Acid and 5...
Rihab, Khairi; Bougarech, Abdelkader; Zaidi, Sami; Althobaiti, Ibrahim O.; Abid, Majdi; Silvestre, Armando J. D.; Sousa, Andreia F.; Abid, SouhirPolymers based on furans have received much attention in recent years due to their renewable origin and high-performance properties; nevertheless, the important class of polyesteramides still remains overlooked. Thus, here we introduced a new series of polyesteramides based on 2,5-furandicarboxylic acid (FDCA), 5,5′-isopropylidene bis(2-furfurylamine) (DAF), and 1,6-hexanediol (HD) (PEAFs), designed to be fully...
Bisfuranic copolyesters bearing nitrated units: synthesis, thermal properties a...
Bougarech, A.; Zaidi, S.; Sousa, Andreia F.; Abid, S.; Silvestre, Armando J. D.; Abid, M.In this study we report a series of partially biobased new (hetero)aromatic copolyesters, namely poly(ethylene-bis(ethyl 2-furoate)-co-ethylene 5-nitroisophthalate)s synthesised via the two-step melt polycondensation process, by combining commercially available dimethyl 5-nitroisophthalate and a biobased bisfuranic diester derivative (DEF), and ethylene glycol. Their expected molecular structure was confirmed b...
From PEF to rPEF: disclosing the potential of deep eutectic solvents in continu...
Agostinho, Beatriz; Silvestre, Armando J. D.; Sousa, Andreia F.Chemical attempts to recycle bio-based poly(ethylene 2,5-furandicarboxylate) (PEF) have not been reported, yet its expected global production, potential accumulation or persistence in the environment calls for innovative solutions. Here, we report the design of a urea : zinc acetate deep eutectic solvent (DES) system for a continuous, eco-friendly and closed-loop approach for recycling PEF into rPEF
Development of Enzymatic Variants for the Synthesis of Bioresorbable Polyesters
Almeida, B. C.; Figueiredo, P. R.; Dourado, D. F. A. R.; Paul, S.; Sousa, Andreia F.; Silvestre, A.J.D.; Quinn, D.J.; Moody, T.S.; Carvalho, A.T.P.Enzymatic synthesis of polymeric materials is a powerful approach to make these processes greener, more economical, and safer for scale-up. Herein, we characterized new variants of the hyperthermophilic carboxylesterase from the archaeon Archaeoglobus fulgidus with quantum mechanics/molecular mechanics molecular dynamics simulations. The designed variants were expressed and tested for the synthesis of poly(ϵ-ca...