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Rheologica Acta

Erschienen in:

01.04.2016 | Original Contribution

Stress relaxation of bi-disperse polystyrene melts

Exploring the interactions between long and short chains in non-linear rheology

verfasst von: Ludovica Hengeller, Qian Huang, Andriy Dorokhin, Nicolas J. Alvarez, Kristoffer Almdal, Ole Hassager

Erschienen in: Rheologica Acta | Ausgabe 4/2016

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Abstract

We present start-up of uniaxial extension followed by stress relaxation experiments of a bi-disperse 50 % by weight blend of 95k and 545k molecular weight polystyrene. We also show, for comparison, stress relaxation measurements of the polystyrene melts with molecular weight 95k and 545k, which are the components of the bi-disperse melt. The measurements show three separated relaxation regimes: a fast regime, a transition regime, and a slow regime. In the fast regime, the orientation of the long chains is frozen and the stress relaxation is due to stretch relaxation of the short chains primarily. Conversely in the slow regime, the long chains have retracted and undergo relaxation of orientation in fully relaxed short chains.

Vorheriger Artikel Viscoelasticity and morphology of polystyrene-block-poly[ethylene-co-(ethylene-propylene)]-block-polystyrene tri-block copolymer/paraffinic oil blends. 1. Effect of oil content

Nächster Artikel Oxidation of bitumen: molecular characterization and influence on rheological properties

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Titel: Stress relaxation of bi-disperse polystyrene melts
Exploring the interactions between long and short chains in non-linear rheology
verfasst von: Ludovica Hengeller
Qian Huang
Andriy Dorokhin
Nicolas J. Alvarez
Kristoffer Almdal
Ole Hassager
Publikationsdatum: 01.04.2016
Verlag: Springer Berlin Heidelberg
Erschienen in: Rheologica Acta / Ausgabe 4/2016
Print ISSN: 0035-4511
Elektronische ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-016-0916-9

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