Decrosslinking reaction kinetics of silane-crosslinked polyethylene in sub- and supercritical fluids

Bum Ki Baek, Yun Ho La, Albert S. Lee, Haksoo Han, Seong Hun Kim, Soon Man Hong, Chong Min Koo

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Supercritical methanol is a popular fluid as a supercritical medium for decrosslinking reaction of crosslinked polyethylene. However, due to its toxicity, a safe alternative medium is much to be desired. In this work, various sub- and supercritical fluids with different polarity characters were investigated to find a safe alternative medium for continuous decrosslinking of silane-crosslinked polyethylene (S-XLPE). Like methanol, all examined fluids, including ethanol, propanol, and water, exhibited first-order reaction kinetics regarding the gel content in the continuous decrosslinking process. The reaction rate constant values were observed as 2.806, 2.569, 2.383, and 2.130 min-1 in supercritical methanol, supercritical ethanol, supercritical 2-propanol, and subcritical water at 380 °C, respectively. As a non-toxic fluid with reaction kinetics very comparable to that of methanol, ethanol was found to be the best alternative medium for the continuous decrosslinking reaction of S-XLPE.

Original languageEnglish
Pages (from-to)103-108
Number of pages6
JournalPolymer Degradation and Stability
Volume130
DOIs
Publication statusPublished - 2016 Aug 1
Externally publishedYes

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Keywords

  • Continuous process
  • Decrosslinking
  • Kinetics
  • Recycling
  • Silane-crosslinked polyethylene
  • Supercritical fluids

ASJC Scopus subject areas

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

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