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Erschienen in: Rheologica Acta 1/2018

23.11.2017 | Original Contribution

An empirical constitutive model for complex glass-forming liquids using bitumen as a model material

verfasst von: Olli-Ville Laukkanen, H. Henning Winter, Hilde Soenen, Jukka Seppälä

Erschienen in: Rheologica Acta | Ausgabe 1/2018

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Abstract

While extensive research efforts have been devoted to understand the dynamics of chemically and structurally simple glass-forming liquids (SGFLs), the viscoelasticity of chemically and structurally complex glass-forming liquids (CGFLs) has received only little attention. This study explores the rheological properties of CGFLs in the vicinity of the glass transition. Bitumen is selected as the model material for CGFLs due to its extremely complex chemical composition and microstructure, fast physical aging and thermorheological simplicity, and abundant availability. A comprehensive rheological analysis reveals a significant broadening of the glass transition dynamics in bitumen as compared to SGFLs. In particular, the relaxation time spectrum of bitumen is characterized by a broad distribution of long relaxation modes. This observation leads to the development of a new constitutive equation, named the broadened power-law spectrum model. In this model, the wide distribution of long relaxation times is described by a power-law with positive exponent and a stretched exponential cut-off, with parameter β serving as a measure of the broadness of the distribution. This characteristic shape of the bitumen spectrum is attributed to the heterogeneous freezing of different molecular components of bitumen, i.e., to the coexistence of liquid and glassy micro-phases. Furthermore, as this type of heterogeneous glass transition behavior can be considered as a general feature of complex glass-forming systems, the broadened power-law spectrum model is expected to be valid for all types of CGFLs. Examples of the applicability of this model in various complex glass-forming systems are given.

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Metadaten
Titel
An empirical constitutive model for complex glass-forming liquids using bitumen as a model material
verfasst von
Olli-Ville Laukkanen
H. Henning Winter
Hilde Soenen
Jukka Seppälä
Publikationsdatum
23.11.2017
Verlag
Springer Berlin Heidelberg
Erschienen in
Rheologica Acta / Ausgabe 1/2018
Print ISSN: 0035-4511
Elektronische ISSN: 1435-1528
DOI
https://doi.org/10.1007/s00397-017-1056-6

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