2015
DOI: 10.1007/s00397-015-0864-9
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On “modulus shift” and thermorheological complexity in polyolefins

Abstract: Sparsely branched polyolefins often exhibit a thermorheological complexity, which was reported to be maskable by a modulus shift. However, the only physical background for a modulus shift is a density change, and this influence factor is only small in the relatively narrow temperature regime accessible by polyolefins. This paper deals with the question, how this modulus shift can be caused by experimental artifacts and real effects. The physical background of these two contributions to a vertical activation en… Show more

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Cited by 13 publications
(8 citation statements)
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“…We assume to be in proximity of a minimum which cannot be observed due to the limited range of frequencies investigated. The presence of a minimum in vGP plots has been already reported in the literature, for example by Stadler et al 28,35,36,37 At the same time, no meaningful information could be obtained upon trying to correlate the double logarithmic derivative of the viscosity function (dlog| * |/dlog ) with the phase angle  (Figure S6). 38 The effect of H 2 on the process and polymer properties was also investigated.…”
Section: Resultsmentioning
confidence: 85%
“…We assume to be in proximity of a minimum which cannot be observed due to the limited range of frequencies investigated. The presence of a minimum in vGP plots has been already reported in the literature, for example by Stadler et al 28,35,36,37 At the same time, no meaningful information could be obtained upon trying to correlate the double logarithmic derivative of the viscosity function (dlog| * |/dlog ) with the phase angle  (Figure S6). 38 The effect of H 2 on the process and polymer properties was also investigated.…”
Section: Resultsmentioning
confidence: 85%
“…This diagram is commonly known as the van Gurp-Palmen plot (van Gurp and Palmen 1998) or the Booij-Palmen plot (Booij and Palmen 1992), and it is particularly suitable for detecting thermorheological complexity, i.e. a failure of TTSP (Dealy and Plazek 2009;Stadler et al 2015). In the case of bitumen, the frequency sweep data measured at different temperatures appear to superimpose, indicating thermorheological simplicity.…”
Section: Linear Viscoelasticity Of Bitumen Near and Below The Glass Tmentioning
confidence: 99%
“…No unphysical modulus shift was used for the shift. [ 15 ] The resulting master curve of polyM10 (Figure 4b; other master curves Figures S17–S20, Supporting Information)) shows the typical features of unentangled polymer melts. At the highest frequencies a peak in loss modulus G ′′( a T ∙ ω ) is found and the storage modulus G ′( a T ∙ ω ) reaches the glassy plateau.…”
Section: Resultsmentioning
confidence: 96%