Viscoelastic properties of decrosslinked irradiation-crosslinked polyethylenes in supercritical methanol

The viscoelastic properties of decrosslinked irradiation-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 sl...

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Bibliographic Details
Published in:Journal of polymer science. Part B, Polymer physics Polymer physics, 2010-06, Vol.48 (12), p.1265-1270
Main Authors: Kwon, Yong Jin, Hong, Soon Man, Koo, Chong Min
Format: Article
Language:English
Subjects:
Applied sciences
Cross-linked polyethylene
decrosslink
degradation
Dynamic tests
Exact sciences and technology
Methyl alcohol
polyethylene
Polyethylenes
Polymer industry, paints, wood
Relaxation time
Reproduction
Rheological properties
Stress relaxation
supercritical CO2
Technology of polymers
viscoelastic properties
Viscoelasticity
Waste treatment
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Summary:The viscoelastic properties of decrosslinked irradiation-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.
ISSN:0887-6266
1099-0488
1099-0488
DOI:10.1002/polb.22019