Comparison of the elongational behavior of various polyolefins in uniaxial and equibiaxial flows

Stadler, Florian J.; Nishioka, Akihiro; Stange, Jens; Koyama, Kiyohito; Münstedt, Helmut

doi:10.1007/s00397-007-0190-y

Cited by 68 publications

(38 citation statements)

References 50 publications

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“…Wagner et al [26] showed that for a LDPE-melt, which is very similar to the used one, the strain-hardening behavior in planar elongation is nearly the same as in uniaxial elongation. This behavior was found for different materials in the literature, too [30].…”

Section: Equipmentmentioning

confidence: 65%

Dependence of the secondary flow of a low-density polyethylene on processing parameters as investigated by laser-Doppler velocimetry

Hertel¹,

Münstedt²

2008

Journal of Non-Newtonian Fluid Mechanics

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Section: Equipmentmentioning

confidence: 65%

Dependence of the secondary flow of a low-density polyethylene on processing parameters as investigated by laser-Doppler velocimetry

Hertel¹,

Münstedt²

2008

Journal of Non-Newtonian Fluid Mechanics

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“…The bulk of literature on analytical rheology relies on linear viscoelasticity, because experiments are more convenient to perform and less prone to experimental error like wall-slip and shear-banding. However, quite a few studies have considered the difference in the nonlinear shear or extensional response of LPs and BPs [91,[307][308][309][310][311][312][313][314] as a probe of LCB.…”

Section: Experimental Methodsmentioning

confidence: 99%

Analytical Rheology of Polymer Melts: State of the Art

Shanbhag

2012

ISRN Materials Science

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The extreme sensitivity of rheology to the microstructure of polymer melts has prompted the development of "analytical rheology," which seeks inferring the structure and composition of an unknown sample based on rheological measurements. Typically, this involves the inversion of a model, which may be mathematical, computational, or completely empirical. Despite the imperfect state of existing models, analytical rheology remains a practically useful enterprise. I review its successes and failures in inferring the molecular weight distribution of linear polymers and the branching content in branched polymers.

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“…Experimental details of the sample preparation and measuring techniques used are described in part I of this article series in detail [7] as well as their microstructure. Some rheological data about these samples have been published elsewhere as well [14,15,[30][31][32][33][34][35]. …”

Section: Methodsmentioning

confidence: 98%

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

Stadler

2011

Korean J. Chem. Eng.

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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 o 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 o 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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Comparison of the elongational behavior of various polyolefins in uniaxial and equibiaxial flows

Cited by 68 publications

References 50 publications

Dependence of the secondary flow of a low-density polyethylene on processing parameters as investigated by laser-Doppler velocimetry

Dependence of the secondary flow of a low-density polyethylene on processing parameters as investigated by laser-Doppler velocimetry

Analytical Rheology of Polymer Melts: State of the Art

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

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