Kwon, Yong Jin Hong, Soon Man Koo, Chong Min 2024-01-20T19:02:53Z 2024-01-20T19:02:53Z 2021-09-02 2010-06-15 0887-6266 https://pubs.kist.re.kr/handle/201004/131330 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. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 1265-1270, 2010 English WILEY RHEOLOGICAL PROPERTIES MOLECULAR-WEIGHT POLYMERS LINKING MELTS FOAM Viscoelastic Properties of Decrosslinked Irradiation-Crosslinked Polyethylenes in Supercritical Methanol Article 10.1002/polb.22019 1 JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, v.48, no.12, pp.1265 - 1270 JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS 48 12 1265 1270 scie scopus 000278750600003 2-s2.0-77952979935 Polymer Science Polymer Science Article RHEOLOGICAL PROPERTIES MOLECULAR-WEIGHT POLYMERS LINKING MELTS FOAM decrosslink degradation polyethylene supercritical CO2 viscoelastic properties