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Slezák E, Ronkay F, Réz D, Bocz K. Recyclability of elastomer toughened recycled poly(ethylene terephthalate): The effect of grinding-extrusion-injection moulding on the mechanical and morphological properties of the blend. Heliyon 2024; 10:e32096. [PMID: 38867993 PMCID: PMC11168396 DOI: 10.1016/j.heliyon.2024.e32096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Revised: 05/28/2024] [Accepted: 05/28/2024] [Indexed: 06/14/2024] Open
Abstract
Reprocessing potential of recycled poly(ethylene-terephthalate) (RPET)/ethylene-butyl-acrylate-glycidyl methacrylate (EBA-GMA) blends was investigated. PET flakes from food packaging were compounded with 0, 5, 10, 15 and 20 % EBA-GMA. Injection moulded specimens were produced, and some of the specimens were grinded, and reproduced to simulate real reprocessing. It was revealed by scanning electron microscopy that the distribution and particle size of the elastomer did not change notably after recycling. Noticeable degradation of the polymer matrix was observable after every processing step. Such deterioration of PET resulted in higher crystallinity and rigid amorphous fraction, as found by differential scanning calorimetry, which ultimately led to higher storage modulus, while the notched impact strength and elongation at break decreased. Nevertheless, the mechanical performance of the reprocessed RPET/EBA-GMA blends still significantly outperforms that of the neat PET recyclate. The degree of chain breakage was found to be the primary factor determining the recyclability of RPET/EBA-GMA blends.
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Affiliation(s)
- Emese Slezák
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111, Budapest, Hungary
| | - Ferenc Ronkay
- Department of Innovative Vehicles and Materials, GAMF Faculty of Engineering and Computer Science, John von Neumann University, H-6000, Kecskemét, Hungary
| | - Dávid Réz
- Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111, Budapest, Hungary
| | - Katalin Bocz
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111, Budapest, Hungary
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2
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Li Z, Chu Y, Huang Q, Jin X, Qiu Z, Jin J. Crystallization Behavior of Copolyesters Containing Sulfonates. Polymers (Basel) 2024; 16:1177. [PMID: 38675096 PMCID: PMC11054151 DOI: 10.3390/polym16081177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 03/28/2024] [Accepted: 04/02/2024] [Indexed: 04/28/2024] Open
Abstract
The polar sulfonate groups in cationic dyeable polyester (CDP) lead to complex crystallization behavior, affecting CDP production's stability. In this study, cationic dyeable polyesters (CDP) with different sulfonate group contents were prepared via one-step feeding of sodium isophthalic acid-5-sulfonate (SIPA), terephthalic acid (PTA), and ethylene glycol (EG). The non-isothermal crystallization behavior of these copolyesters was analyzed by differential scanning calorimetry (DSC). Results show that the crystallization temperature of the sample shifts to lower values with the increase in SIPA content. The relaxation behavior of the molecular chain is enhanced due to the ionic aggregation effect of sulfonate groups in CDP. Therefore, at low cooling rates (2.5 °C/min and 5 °C/min), some molecular chain segments in CDP are still too late to orderly stack into the lattice, forming metastable crystals, and melting double peaks appear on the melting curve after crystallization. When the cooling rate increases (10-20 °C/min), the limited region of sulfonate aggregation in CDP increases, resulting in more random chain segments, and a cold crystallization peak appears on the melting curve after crystallization. The non-isothermal crystallization behavior of all samples was fitted and analyzed by the Jeziorny equation, Ozawa equation, and Mo equation. The results indicate that the nucleation density and nucleation growth rate of CDP decrease with the increase in SIPA content. Meanwhile, analysis of the Kissinger equation reveals that the activation energy of non-isothermal crystallization decreases gradually with the increase in SIPA content, and the addition of SIPA makes CDP crystallization more difficult.
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Affiliation(s)
- Zhiyong Li
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China; (Z.L.); (Y.C.)
- State Key Laboratory of Biobased Fiber Manufacturing Technology, China Textile Academy Co., Ltd., Beijing 100025, China; (X.J.); (Z.Q.); (J.J.)
| | - Yongjing Chu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China; (Z.L.); (Y.C.)
| | - Qing Huang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China; (Z.L.); (Y.C.)
- State Key Laboratory of Biobased Fiber Manufacturing Technology, China Textile Academy Co., Ltd., Beijing 100025, China; (X.J.); (Z.Q.); (J.J.)
| | - Xiaopei Jin
- State Key Laboratory of Biobased Fiber Manufacturing Technology, China Textile Academy Co., Ltd., Beijing 100025, China; (X.J.); (Z.Q.); (J.J.)
| | - Zhicheng Qiu
- State Key Laboratory of Biobased Fiber Manufacturing Technology, China Textile Academy Co., Ltd., Beijing 100025, China; (X.J.); (Z.Q.); (J.J.)
| | - Jian Jin
- State Key Laboratory of Biobased Fiber Manufacturing Technology, China Textile Academy Co., Ltd., Beijing 100025, China; (X.J.); (Z.Q.); (J.J.)
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Sevilla ME, Garcia MD, Perez-Castillo Y, Armijos-Jaramillo V, Casado S, Vizuete K, Debut A, Cerda-Mejía L. Degradation of PET Bottles by an Engineered Ideonella sakaiensis PETase. Polymers (Basel) 2023; 15:polym15071779. [PMID: 37050393 PMCID: PMC10098701 DOI: 10.3390/polym15071779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 03/27/2023] [Accepted: 03/28/2023] [Indexed: 04/14/2023] Open
Abstract
Extensive plastic production has become a serious environmental and health problem due to the lack of efficient treatment of plastic waste. Polyethylene terephthalate (PET) is one of the most used polymers and is accumulating in landfills or elsewhere in nature at alarming rates. In recent years, enzymatic degradation of PET by Ideonella sakaiensis PETase (IsPETase), a cutinase-like enzyme, has emerged as a promising strategy to completely depolymerize this polymer into its building blocks. Here, inspired by the architecture of cutinases and lipases homologous to IsPETase and using 3D structure information of the enzyme, we rationally designed three mutations in IsPETase active site for enhancing its PET-degrading activity. In particular, the S238Y mutant, located nearby the catalytic triad, showed a degradation activity increased by 3.3-fold in comparison to the wild-type enzyme. Importantly, this structural modification favoured the function of the enzyme in breaking down highly crystallized (~31%) PET, which is found in commercial soft drink bottles. In addition, microscopical analysis of enzyme-treated PET samples showed that IsPETase acts better when the smooth surface of highly crystalline PET is altered by mechanical stress. These results represent important progress in the accomplishment of a sustainable and complete degradation of PET pollution.
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Affiliation(s)
- Maria Eduarda Sevilla
- Facultad de Ciencia e Ingeniería en Alimentos y Biotecnología, Universidad Técnica de Ambato, Ambato 180216, Ecuador
| | - Mario D Garcia
- Facultad de Ciencia e Ingeniería en Alimentos y Biotecnología, Universidad Técnica de Ambato, Ambato 180216, Ecuador
| | - Yunierkis Perez-Castillo
- Área de Ciencias Aplicadas, Facultad de Ingeniería y Ciencias Aplicadas, Universidad de Las Américas, Quito 170125, Ecuador
- Grupo de Bio-Quimioinformática, Universidad de Las Américas, Quito 170125, Ecuador
| | - Vinicio Armijos-Jaramillo
- Grupo de Bio-Quimioinformática, Universidad de Las Américas, Quito 170125, Ecuador
- Ingeniería en Biotecnología, Facultad de Ingeniería y Ciencias Aplicadas, Universidad de Las Américas, Quito 170125, Ecuador
| | - Santiago Casado
- Facultad de Ciencia e Ingeniería en Alimentos y Biotecnología, Universidad Técnica de Ambato, Ambato 180216, Ecuador
| | - Karla Vizuete
- Centro de Nanociencia y Nanotecnología, Universidad de Las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador
| | - Alexis Debut
- Centro de Nanociencia y Nanotecnología, Universidad de Las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador
- Departamento de Ciencias de la Vida y Agricultura, Universidad de Las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador
| | - Liliana Cerda-Mejía
- Facultad de Ciencia e Ingeniería en Alimentos y Biotecnología, Universidad Técnica de Ambato, Ambato 180216, Ecuador
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Kaczor D, Bajer K, Raszkowska-Kaczor A, Domek G, Madajski P, Szroeder P. The Influence of Multiple Extrusions on the Properties of High Filled Polylactide/Multiwall Carbon Nanotube Composites. MATERIALS (BASEL, SWITZERLAND) 2022; 15:8958. [PMID: 36556763 PMCID: PMC9784206 DOI: 10.3390/ma15248958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 12/08/2022] [Accepted: 12/13/2022] [Indexed: 06/17/2023]
Abstract
High filled polylactide/multiwall carbon nanotube composites were subjected to multiple extrusions using single-screw and twin-screw extruders. Samples of the processed composites were characterized by SEM, XRD, Raman, and FTIR spectroscopy. Thermal and rheological properties were investigated by DSC and MFR analyses. Subsequent extrusions resulted in decreased torque and process efficiency, which is a consequence of the viscosity reduction of PLA. Thermal and rheological properties of composites changed after each extrusion as well. As revealed by DSC analyses, cold crystallization temperature showed a tendency to decrease after each process, whereas cold crystallization enthalpy ΔHcc increased significantly. Melt flow rate, which is indicative of the polymer degradation, increased after each extrusion.
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Affiliation(s)
- Daniel Kaczor
- Łukasiewicz Research Network—Institute for Engineering of Polymer Materials and Dyes, Marii Skłodowskiej-Curie 55, 87-100 Toruń, Poland
- Faculty of Mechatronics, Kazimierz Wielki University, Kopernika 1, 85-074 Bydgoszcz, Poland
| | - Krzysztof Bajer
- Łukasiewicz Research Network—Institute for Engineering of Polymer Materials and Dyes, Marii Skłodowskiej-Curie 55, 87-100 Toruń, Poland
| | - Aneta Raszkowska-Kaczor
- Łukasiewicz Research Network—Institute for Engineering of Polymer Materials and Dyes, Marii Skłodowskiej-Curie 55, 87-100 Toruń, Poland
| | - Grzegorz Domek
- Faculty of Mechatronics, Kazimierz Wielki University, Kopernika 1, 85-074 Bydgoszcz, Poland
| | - Piotr Madajski
- Faculty of Chemistry, Nicolaus Copernicus University, Gagarina 7, 87-100 Toruń, Poland
| | - Pawel Szroeder
- Institute of Physics, Kazimierz Wielki University, Powstańców Wielkopolskich 2, 85-090 Bydgoszcz, Poland
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Goli VSNS, Singh DN. Comments on "Effect of landfill age on the physical and chemical characteristics of waste plastics/microplastics in a waste landfill sites". ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 315:120345. [PMID: 36228855 DOI: 10.1016/j.envpol.2022.120345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 09/24/2022] [Accepted: 09/29/2022] [Indexed: 06/16/2023]
Affiliation(s)
| | - Devendra Narain Singh
- Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai, 400 076, India.
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Ronkay F, Molnár B, Szabó E, Marosi G, Bocz K. Water boosts reactive toughening of PET. Polym Degrad Stab 2022. [DOI: 10.1016/j.polymdegradstab.2022.110052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Peixoto T, Carneiro S, Fangueiro R, Guedes RM, Paiva MC, Lopes MA. Engineering hybrid textile braids for tendon and ligament repair application. J Appl Polym Sci 2022. [DOI: 10.1002/app.52013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Tânia Peixoto
- REQUIMTE‐LAQV, Departamento de Engenharia Metalúrgica e Materiais, Faculdade de Engenharia Universidade do Porto Porto Portugal
- Instituto de Polímeros e Compósitos, Departamento de Engenharia de Polímeros Universidade do Minho Guimarães Portugal
| | - Sofia Carneiro
- REQUIMTE‐LAQV, Departamento de Engenharia Metalúrgica e Materiais, Faculdade de Engenharia Universidade do Porto Porto Portugal
| | - Raúl Fangueiro
- Centro de Ciência e Tecnologia Têxtil Universidade do Minho Guimarães Portugal
| | - Rui M. Guedes
- INEGI, Departamento de Engenharia Mecânica, Faculdade de Engenharia Universidade do Porto Porto Portugal
| | - Maria C. Paiva
- Instituto de Polímeros e Compósitos, Departamento de Engenharia de Polímeros Universidade do Minho Guimarães Portugal
| | - Maria A. Lopes
- REQUIMTE‐LAQV, Departamento de Engenharia Metalúrgica e Materiais, Faculdade de Engenharia Universidade do Porto Porto Portugal
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Dielectric, structural and mechanical properties of thermally aged biaxially oriented polymeric substrates for flexible electronics. Polym Degrad Stab 2022. [DOI: 10.1016/j.polymdegradstab.2022.109906] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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