Van Gurp-Palmen-plot : a way to characterize polydispersity of linear polymers

This article is concerned with the so-called van Gurp-Palmen-plot which charts the phase angles vs the absolute values of the complex shear modulus from a rheological experiment. Its basic characteristic features are elucidated for polymers having a simple, i.e., a linear structure. A subsequent man...

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Bibliographic Details
Published in:Rheologica acta 2001-07, Vol.40 (4), p.322-328
Main Authors: TRINKLE, Stefan, FRIEDRICH, Christian
Format: Article
Language:English
Subjects:
Applied sciences
Chain branching
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polydispersity
Polymers
Properties and characterization
Rheological properties
Rheology and viscoelasticity
Shear modulus
Topology
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Summary:This article is concerned with the so-called van Gurp-Palmen-plot which charts the phase angles vs the absolute values of the complex shear modulus from a rheological experiment. Its basic characteristic features are elucidated for polymers having a simple, i.e., a linear structure. A subsequent manuscript will then address more complicated topologies as present in long chain branched polymers.A unique type of curve is typical for linear samples. This type of curve is characterized by one minimum and one inflection point. The locations of these points and thus the shape of the curve are correlated to the plateau modulus, to the molecular weight, and, especially, to the polydispersity. With these findings in mind, scaling is then introduced to the van Gurp-Palmen-plot. Finally, bimodal homopolymer blends are considered in order to learn how two distinct relaxation processes influence the shape of the van Gurp-Palmen-plot.
ISSN:0035-4511
1435-1528
DOI:10.1007/s003970000137