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<p>Chemical recycling of poly (ethylene terephthalate) (PET) is often hampered by side reactions producing diethylene glycol fragments and acetaldehyde, which compromise polymer quality. Here, we present an acid-ester exchange melt polycondensation strategy using ethylene glycol diacetate (EGDA) and terephthalic acid (TPA), which inherently excludes free hydroxyl groups from the polymerization system, thereby suppressing ether formation and acetaldehyde generation. The resulting PET achieves moderate molecular weight, good color, and structural regularity comparable to commercial fiber-grade PET, as confirmed by <sup>1</sup>H NMR, gas chromatography, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) analyses. Extending this approach to bio-based 2,5-furandicarboxylic acid (FDCA) enables the synthesis of poly (ethylene 2,5-furandicarboxylate) (PEF) with similarly comparable molecular weight, good color, and thermal performance. The acetate-mediated route provides theoretical support for a scalable, sustainable platform for closed-loop recycling and high-quality polyester production.</p>

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Eliminating Hydroxyl-Induced Side Reactions in Polyester Synthesis: An Acid-Ester Exchange Strategy for PET and PEF Regeneration

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Yan Zhao,
  • Feiyang Song,
  • Minshu Cui,
  • Hao Cui,
  • Chenqiang Deng,
  • Jin Deng

摘要

Chemical recycling of poly (ethylene terephthalate) (PET) is often hampered by side reactions producing diethylene glycol fragments and acetaldehyde, which compromise polymer quality. Here, we present an acid-ester exchange melt polycondensation strategy using ethylene glycol diacetate (EGDA) and terephthalic acid (TPA), which inherently excludes free hydroxyl groups from the polymerization system, thereby suppressing ether formation and acetaldehyde generation. The resulting PET achieves moderate molecular weight, good color, and structural regularity comparable to commercial fiber-grade PET, as confirmed by 1H NMR, gas chromatography, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) analyses. Extending this approach to bio-based 2,5-furandicarboxylic acid (FDCA) enables the synthesis of poly (ethylene 2,5-furandicarboxylate) (PEF) with similarly comparable molecular weight, good color, and thermal performance. The acetate-mediated route provides theoretical support for a scalable, sustainable platform for closed-loop recycling and high-quality polyester production.