Ronkay, Ferenc and Gere, Dániel and Slezák, Emese and Szabó, Edina and Marosi, György and Bordácsné Bocz, Katalin (2025) Recycled PET Packaging Materials of Improved Toughness : Importance of Devitrification of the Rigid Amorphous Fraction. MACROMOLECULAR MATERIALS AND ENGINEERING, 310 (2). No. 2400219. ISSN 1438-7492
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Abstract
Degradation, a common problem faced during the processing of recycled poly(ethylene terephthalate) (PET), leads to significant embrittlement of the products, as a result of which the material loses its applicability. Increased crystallization rate of the short chains of recycled PET and obstructed mobility of the amorphous phase are the main causes of enhanced brittleness. In this research, a straightforward method is proposed for improving the toughness of recycled PET products, namely the devitrification of the rigid amorphous phase by thermal annealing, which results in enhanced molecular mobility in the amorphous fraction, thereby promoting ductile deformation. The effects of thermal annealing conditions are comprehensively evaluated on the microstructure and macroscopic properties, i.e., impact resistance, of recycled PET films. The perforation energy value of the recycled PET film is found to increase to its threefold, reaching a value higher than 18 J mm −1 , as a result of 10 s thermal treatment at 120 °C. Differential scanning calorimetry, dynamic mechanical analyses, and thermally stimulated depolarization current measurements provide evidence for the devitrification of the rigid amorphous fraction under these conditions, which is the key to efficient enhancement in toughness.
| Item Type: | Article |
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| Additional Information: | First published online: 04 December 2024 Funding Agency and Grant Number: National Research, Development and Innovation Fund of Hungary [GINOP_PLUSZ-2.1.1-21-2022-00041]; Hungarian Scientific Research Fund [PD146135]; Sustainable Development and Technologies National Programme of the Hungarian Academy of Sciences (FFT NP FTA); New National Excellence Program of the Ministry for Culture and Innovation from the source of the National Research, Development and Innovation Fund [UNKP-23-5-BME-453]; Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund [KDP-IKT-2023-900-I1-00000957/0000003]; Hungarian Academy of Sciences; [K143039] Funding text: The authors are grateful to Dr. Janos Madarasz (Budapest University of Technology and Economics) for his cooperation in WAXD measurements. The project was funded by the National Research, Development and Innovation Fund of Hungary in the frame of the GINOP_PLUSZ-2.1.1-21-2022-00041 project. The research was supported by the Hungarian Scientific Research Fund, grant number K143039 and PD146135. The research was funded by the Sustainable Development and Technologies National Programme of the Hungarian Academy of Sciences (FFT NP FTA). D.G. is thankful for the support of the UNKP-23-5-BME-453 New National Excellence Program of the Ministry for Culture and Innovation from the source of the National Research, Development and Innovation Fund. E.S. expresses her gratitude for the project no. KDP-IKT-2023-900-I1-00000957/0000003, which has been implemented with the support provided by the Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, financed under the KDP-2023 funding scheme. D.G. and E.Sz. are thankful for the Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences. |
| Subjects: | Q Science / természettudomány > QC Physics / fizika > QC173.4 Material science / anyagtudomány T Technology / alkalmazott, műszaki tudományok > T2 Technology (General) / műszaki tudományok általában |
| SWORD Depositor: | MTMT SWORD |
| Depositing User: | MTMT SWORD |
| Date Deposited: | 23 Sep 2025 12:46 |
| Last Modified: | 23 Sep 2025 12:46 |
| URI: | https://real.mtak.hu/id/eprint/224967 |
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