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Dynamic-mechanical behavior of polyethylenes and ethene/α-olefin-copolymers: Part II. α- and β-relaxation

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Abstract

Several ethylene homopolymers and ethene/ α-olefin-copolymers with crystallinities ranging between 85 and 12% were characterized by dynamic-mechanical measurements. The occurring relaxations were correlated to the crystallinity of the polymeric materials and to morphology. The α-relaxation, being attributed to interlamellar shear, was found to be around 60 °C with activation energies of about 120 kJ/mol in samples with more than 42% crystallinity. The β-transition shows a much greater variety among the different samples characterized. Its relaxation temperatures vary between −40 and 10 °C with activation energies between 200 and 400 kJ/mol. The α- and β-relaxation of several quenched samples with crystallinities between 63 and 42% were found to overlap, thus producing bimodal maxima and different activation energies from the Arrhenius plots. A separation of these overlapping relaxations was only possible by measuring the relaxations over a frequency range of more than three orders of magnitude.

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Authors and Affiliations

  1. School of Semiconductor and Chemical Engineering, Chonbuk National University, 664-14, 1-ga Deokjin-dong, Deokjin-gu, Jeonju, Jeonbuk, 561-756, Korea

    Florian J. Stadler

  2. Polymer Materials, Friedrich-Alexander University Erlangen-Nürnberg, Martensstr. 7, D-91058, Erlangen, Germany

    Florian J. Stadler

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  1. Florian J. Stadler
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Correspondence to Florian J. Stadler.

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This paper is dedicated to Professor Ki Ju Kim for celebrating his retirement from Division of Chemical Engineering of Chonbuk National University

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Stadler, F.J. Dynamic-mechanical behavior of polyethylenes and ethene/α-olefin-copolymers: Part II. α- and β-relaxation. Korean J. Chem. Eng. 28, 954–963 (2011). https://doi.org/10.1007/s11814-010-0411-4

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  • DOI: https://doi.org/10.1007/s11814-010-0411-4

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