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Menghe Xu1, Peng Liu2, Changle Chen1

  • 1Key Laboratory of Precision and Intelligent Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, China.

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|February 2, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

This study introduces a novel method for recycling cross-linked polyethylene (XLPE) by creating a mechanochemically triggered, recyclable system. This breakthrough offers a sustainable solution for durable polyethylene materials, enabling closed-loop recycling.

Keywords:
ball millcross‐linked PEpolyethylene recyclingpolymer degradationpolymer mechanochemistry

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • Polyethylene (PE) and cross-linked polyethylene (XLPE) are vital for infrastructure but pose sustainability challenges due to their environmental persistence and lack of recyclability.
  • Conventional recycling methods are ineffective for XLPE, necessitating innovative approaches for sustainable material management.

Purpose of the Study:

  • To develop a mechanochemically triggered, chemically recyclable system for cross-linked polyethylene (XLPE).
  • To enable closed-loop recycling of PE-like materials, reconciling durability with environmental responsibility.

Main Methods:

  • Palladium-catalyzed coordination copolymerization of ethylene with a cyclobutene-fused ester (CBE) comonomer to create polar PE-like materials.
  • Mechanochemical activation via ball-milling (effective even with high crystallinity) in the presence of a radical inhibitor to induce ring-opening and install ester linkages.
  • Chemical recycling through ethanolysis of ester linkages to form oligomers, followed by hydrogenation and repolymerization via transesterification.

    • Main Results:

    • Achieved polar PE-like materials with tunable properties through copolymerization.
    • Demonstrated efficient mechanochemical activation of CBE units, installing recyclable ester linkages into the polymer backbone.
    • Successfully converted XLPE into multifunctional oligomers and repolymerized them into recyclable XLPE with comparable properties to commercial analogues.

    Conclusions:

    • Developed a robust platform for the closed-loop recycling of XLPE, addressing a critical sustainability challenge in polyolefin materials.
    • Reconciled the inherent durability of polyethylene with the urgent need for effective recycling strategies.
    • Paved the way for transformative, sustainable polyolefin production and waste management.