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<p>Poly(ethylene terephthalate) glycol (PETG) is a widely used thermoplastic copolyester known for its excellent transparency, processability, and mechanical toughness. However, its relatively low glass transition temperature (T<sub>g</sub>) limits its use in heat-resistant applications. To address this limitation, a series of copolymers were synthesized by incorporating a rigid diol monomer, DHSE, which contains fused multiple ring structures. The introduction of DHSE effectively enhanced the heat resistance, thermal stability, and tensile strength of the copolymers while maintaining good optical transparency. The T<sub>g</sub> increased from 81.2&#xa0;℃ for pristine PETG to 120.4&#xa0;℃ for PETG with 29.3&#xa0;mol% incorporation of DHSE, while the tensile strength improved from 32.93 to 50.37&#xa0;MPa, with the elongation at break remaining above 350%. In addition, the films exhibited high visible-light transmittance and significantly enhanced UV-blocking ability with increasing DHSE content. These results suggest that DHSE-based PETG copolymers offer a promising strategy for the development of thermally stable, optically transparent, and mechanically robust polymer films for advanced packaging and optical applications.</p> Graphical abstract <p></p>

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Synthesis and characterization of PETG copolymers incorporating rigid fused-ring diols for enhanced heat resistance

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • Siyoung Lee,
  • Hyunhee Lee,
  • Jusung Han,
  • Jinwook Park,
  • Jong-Chan Lee

摘要

Poly(ethylene terephthalate) glycol (PETG) is a widely used thermoplastic copolyester known for its excellent transparency, processability, and mechanical toughness. However, its relatively low glass transition temperature (Tg) limits its use in heat-resistant applications. To address this limitation, a series of copolymers were synthesized by incorporating a rigid diol monomer, DHSE, which contains fused multiple ring structures. The introduction of DHSE effectively enhanced the heat resistance, thermal stability, and tensile strength of the copolymers while maintaining good optical transparency. The Tg increased from 81.2 ℃ for pristine PETG to 120.4 ℃ for PETG with 29.3 mol% incorporation of DHSE, while the tensile strength improved from 32.93 to 50.37 MPa, with the elongation at break remaining above 350%. In addition, the films exhibited high visible-light transmittance and significantly enhanced UV-blocking ability with increasing DHSE content. These results suggest that DHSE-based PETG copolymers offer a promising strategy for the development of thermally stable, optically transparent, and mechanically robust polymer films for advanced packaging and optical applications.

Graphical abstract