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Issue
Korean Journal of Chemical Engineering,
Vol.28, No.3, 954-963, 2011
Dynamic-mechanical behavior of polyethylenes and ethene/α-olefin-copolymers: Part II. α- and β-relaxation
Stadler FJ
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 oC 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 oC 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.
Keywords: Polyethylene; Ethene-/α-olefin-copolymer; Dynamic-mechanical Properties; Activation Energy; α-Relaxation; β-Relaxation
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[Cited By]
  1. Stadler FJ, Korean Journal of Chemical Engineering, 28(10), 2057, 2011
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