New Strategy and Polymer Design to Synthesize Polyamide 66 (PA66) Copolymers with Aromatic Moieties from Recycled PET (rPET)
Abstract
Recycling of poly(ethylene terephthalate) (PET) is considered to be a promising way to reduce environmental pollution. In this work, the valuable monomer bis(6-aminohexyl) terephthalamide (BAHT) comprising aromatic moieties was synthesized using recycled PET (rPET) waste by an aminolysis process. Five kinds of PA66 copolyamides with different contents of BAHT-AA salt (0–50 mol %, with a partially renewable content of 0–47.1 wt %) were successfully synthesized by the melt polycondensation method. The thermal and mechanical properties, crystallization kinetics, relaxation, and rheological behavior of these copolyamides were systematically investigated. The effect of BAHT-AA content on the resultant PA66 copolyamides properties was studied. The incorporation of BAHT-AA salt greatly improved the thermal and mechanical properties of the PA66 copolyamides compared to PA66/6T. This demonstrates that the monomer derived from the rPET can effectively endow a PA66 system with a well-distributed regulation of aromatic rings on its polymer backbones, with a rapid crystallization rate and high mechanical performance. Furthermore, the rPET-derived polyamides allow higher melt viscosity and exhibit a higher degree of shear-thin behavior, which is caused by the presence of more complex interaction in the polymer system. This discovery could provide a new concept for the PET waste treatment system, thus setting the stage for the recycling technique from rPET to polyamides.
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A novel approach synthesized bis(6-aminohexyl) terephthalamide through the aminolysis of recycled PET (rPET) waste.
“Furthermore, a novel approach synthesized bis(6-aminohexyl) terephthalamide through the aminolysis of recycled PET (rPET) waste.”
From Transforming Plastic Waste into Value: A Review of Management Strategies and Innovative Applications in Sustainable Construction (2025) · cites this paper as [69]
Five different types of PA66 copolyamides were effectively produced using the melt polycondensation method.
“Another example involved effectively producing five different types of PA66 copolyamides using the melt polycondensation method [69].”
From Transforming Plastic Waste into Value: A Review of Management Strategies and Innovative Applications in Sustainable Construction (2025) · cites this paper as [69]
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Haba, B., Djellali, S., Abdelouahed, Y., Boudjelida, S., Faleschini, F., & Carraro, M. (2025) · Polymers · doi:10.3390/polym17070881 · Cited by 68 · see citing works
- Authors
- Chen, Y.-H., Ranganathan, P., Lee, Y.-H., & Rwei, S.-P.
- Affiliations
- Institute of Organic and Polymeric Materials, Research and Development Center of Smart Textile Technology, National Taipei University of Technology, No. 1, Sector 3, Chung-Hsiao East Road, Taipei 10608, Taiwan, Republic of China
- National Taipei University of Technology (TW)
- Corresponding author
- Rwei, Syang-Peng
- Venue
- ACS Sustainable Chemistry & Engineering
- Publisher
- American Chemical Society (ACS)
- Published
- 2021-02-23
- Volume
- 9
- Issue
- 9
- Pages
- 3518-3528
- ISSN
- 2168-0485 (ISSN-L)
- OpenAlex
- W3132114722
- Cited by
- 46
- References
- 48
- Citations by year
- 2026: 6 · 2025: 16 · 2024: 3 · 2023: 7 · 2022: 12 · 2021: 2
- FWCI
- 2.13
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- ACS Sustainable Chemistry & Engineering (publishedVersion)
- Funders
- Ministry of Science and Technology, Taiwan (MOST 109-2634-F-027-001)
- Topics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
- Keywords
- recycled PET, aminolysis, aromatic monomers, melt polycondensation, crystallization kinetics, thermal properties, mechanical properties, melt rheology, shear thinning
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