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<p>We assess herein an organocatalyst supported onto isophthalic acid for the synthesis of polyethylene terephthalate (PET). The polycondensation proceeds at rates of the same order as those observed using the conventional Sb<sub>2</sub>O<sub>3</sub> catalyst, and the molecular weights are very close. Higher diethylene glycol contents are observed using the sulfonic acid as catalyst, leading to glass transition temperatures around 72–73℃ <i>vs.</i> 81℃ for the reference. The introduction of a base in the form of an ionic salt enables to attenuate this decrease. The PET formed using the sulfonic acid is shown to be more easily recyclable by glycolysis.</p> Graphical abstract <p></p>

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Insertion of sulfoisophthalic acid into polyethylene terephthalate (PET): Effect on the polycondensation step and on chemical recycling

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Da Shi,
  • Florine Belliot-Nonque,
  • Aymerick Le Pronier,
  • Nicholas Stanley,
  • Thomas Chenal,
  • Thierry Delaunay,
  • Nicolas Jacquel,
  • René Saint-Loup,
  • Philippe Zinck

摘要

We assess herein an organocatalyst supported onto isophthalic acid for the synthesis of polyethylene terephthalate (PET). The polycondensation proceeds at rates of the same order as those observed using the conventional Sb2O3 catalyst, and the molecular weights are very close. Higher diethylene glycol contents are observed using the sulfonic acid as catalyst, leading to glass transition temperatures around 72–73℃ vs. 81℃ for the reference. The introduction of a base in the form of an ionic salt enables to attenuate this decrease. The PET formed using the sulfonic acid is shown to be more easily recyclable by glycolysis.

Graphical abstract