Viscoelastic properties of decrosslinked irradiation-crosslinked polyethylenes in supercritical methanol

Yong Jin Kwon, Soon Man Hong, Chong Min Koo

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The viscoelastic properties of decrosslinked irradia-tion-crosslinked polyethylenes using a supercritical methanol were investigated via oscillatory dynamic shear measurements. Decrosslinked polymers at a low reaction temperature exhibited solid-like rheological properties, as evidenced by a small slope at G and G", a long relaxation time, slow stress relaxation behavior, and considerable yield stress. In contrast, decrosslinked polymers at a high temperature exhibited liquid-like rheological properties that included a large slope in G and G, a short relaxation time, fast stress relaxation behavior, and nonyield stress. The difference. in the viscoelastic properties of the decrosslinked polyethylenes was attributed to the difference in the gel content with the reaction temperature. A higher gel content induced stronger solid-like viscoelastic properties. Hence, the rheological measurements were useful for analyzing the molecular structure of decrosslinked polymers using a supercritical fluid.

Original languageEnglish
Pages (from-to)1265-1270
Number of pages6
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume48
Issue number12
DOIs
Publication statusPublished - 2010 Jun 15
Externally publishedYes

Fingerprint

Polyethylenes
Methanol
polyethylenes
Polymers
methyl alcohol
Irradiation
Stress relaxation
Relaxation time
irradiation
Gels
stress relaxation
Supercritical fluids
polymers
Temperature
Molecular structure
relaxation time
Yield stress
gels
slopes
supercritical fluids

Keywords

  • Decrosslink
  • Degradation
  • Polyethylene
  • Supercritical CO
  • Viscoelastic properties

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Viscoelastic properties of decrosslinked irradiation-crosslinked polyethylenes in supercritical methanol. / Kwon, Yong Jin; Hong, Soon Man; Koo, Chong Min.

In: Journal of Polymer Science, Part B: Polymer Physics, Vol. 48, No. 12, 15.06.2010, p. 1265-1270.

Research output: Contribution to journalArticle

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AB - The viscoelastic properties of decrosslinked irradia-tion-crosslinked polyethylenes using a supercritical methanol were investigated via oscillatory dynamic shear measurements. Decrosslinked polymers at a low reaction temperature exhibited solid-like rheological properties, as evidenced by a small slope at G and G", a long relaxation time, slow stress relaxation behavior, and considerable yield stress. In contrast, decrosslinked polymers at a high temperature exhibited liquid-like rheological properties that included a large slope in G and G, a short relaxation time, fast stress relaxation behavior, and nonyield stress. The difference. in the viscoelastic properties of the decrosslinked polyethylenes was attributed to the difference in the gel content with the reaction temperature. A higher gel content induced stronger solid-like viscoelastic properties. Hence, the rheological measurements were useful for analyzing the molecular structure of decrosslinked polymers using a supercritical fluid.

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