A kinetic study of the decross-linking of cross-linked polyethylene in supercritical methanol

Hong shik Lee, Ju Hyeong Jeong, Hang Kyu Cho, Chong Min Koo, Soon Man Hong, Hwayong Kim, Youn Woo Lee

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


The recycling of cross-linked polyethylene (XLPE) by a decross-linking reaction in supercritical methanol was studied using a batch reactor. XLPEs with initial gel contents of 45, 55 and 65% were employed and subjected to reaction temperatures between 320 and 360 °C. Complete decross-linking of XLPE was achieved in 10 min in supercritical methanol at 360 °C and 15 MPa. For the first time, chemical kinetics for the decross-linking reaction is proposed based on the gel concentration, and applicable to the reactor design. With respect to the gel concentration, the first-order reaction model agreed well with the experimental results. The evaluated kinetic constant was 0.0867 ± 0.0082 cm3/mg min at 350 °C, and the activation energy was 578 ± 25 kJ/mol.

Original languageEnglish
Pages (from-to)2084-2088
Number of pages5
JournalPolymer Degradation and Stability
Issue number12
Publication statusPublished - 2008 Dec
Externally publishedYes

Bibliographical note

Funding Information:
This work was performed with the financial assistance from the Resources Recycling R&D Center, which is a 21C Frontier Project of the Korean Ministry of Education, Science and Technology.


  • Cross-linked polyethylene
  • Decross-linking
  • Kinetics
  • Recycling
  • Supercritical methanol

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Polymers and Plastics
  • Materials Chemistry


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