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Floor Temperature-regulated Poly(ether-alt-ester) With Thermal Stability and Chemical Recyclability Enabled by

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We developed floor temperature (Tf)-regulated poly(ether-alt-ester)s (PEAEs) using a novel synthesis strategy. These advanced materials offer enhanced thermostability and recyclability, outperforming traditional ceiling temperature (Tc)-regulated polymers.

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Chemical recyclabilityMacrocyclesPoly(ether‐alt‐ester)Ring‐opening Polymerization

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • Poly(ether-alt-ester)s (PEAEs) offer a balance between depolymerizability and thermostability for advanced materials.
  • Current PEAE research focuses on ceiling temperature (Tc) regulation, often limited by monomer synthesis.
  • Floor temperature (Tf)-regulated PEAEs show promise for enhanced thermodynamic stability but face synthesis challenges.

Purpose of the Study:

  • To develop a novel synthesis strategy for macrocyclic ether-ester monomers.
  • To create the first example of a Tf-regulated PEAE with high performance.
  • To demonstrate improved thermostability, melt processibility, and chemical recyclability in PEAEs.

Main Methods:

  • Developed a "polycondensation-depolymerization" strategy for macrocyclic monomer synthesis.
  • Synthesized Tf-regulated PEAEs via ring-opening polymerization (ROP) of macrocyclic monomers.
  • Characterized the resulting PEAEs for thermal properties, crystallinity, and processibility.

Main Results:

  • Successfully synthesized macrocyclic ether-ester monomers with high efficiency and selectivity.
  • Produced a semi-crystalline, ductile Tf-regulated PEAE with a high decomposition temperature (Td,5% = 378.3 °C).
  • Demonstrated superior thermal stability compared to Tc-regulated poly(1,4-dioxan-2-one) (PPDO, Td,5% = 238.4 °C).

Conclusions:

  • The "polycondensation-depolymerization" strategy enables the synthesis of high-performance Tf-regulated PEAEs.
  • Tf-regulated PEAEs overcome limitations of Tc-regulated analogs, offering enhanced thermostability and recyclability.
  • This work provides a molecular design principle for developing advanced poly(ether-alt-ester) materials.