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Modeling elongational viscosity and brittle fracture of 10 polystyrene Pom-Poms by the hierarchical molecular stress function model

Hirschberg, Valerian 1; Schußmann, Max G. 1; Röpert, Marie-Christin 1; Wilhelm, Manfred 1; Wagner, Manfred H.
1 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)

Abstract:

A Pom-Pom polymer with qa side chains of molecular weight Mw,a at both ends of a backbone chain of molecular weight Mw,b is the simplest branched polymer topology. Ten nearly monodisperse polystyrene Pom-Pom systems synthesized via an optimized anionic polymerization and a grafting-onto method with Mw,b of 100 to 400 kg/mol, Mw,a of 9 to 50 kg/mol, and qa between 9 and 22 are considered. We analyze the elongational rheology of the Pom-Poms by use of the hierarchical multi-mode molecular stress function (HMMSF) model, which has been shown to predict the elongational viscosity of linear and long-chain branched (LCB) polymer melts based exclusively on the linear-viscoelastic characterization and a single material parameter, the so-called dilution modulus GD. For the Pom-Poms considered here, we show that GD can be identified with the plateau modulus G0N=GD, and the modeling of the elongational viscosity of the Pom-Poms does therefore not require any fitting parameter but is fully determined by the linear-viscoelastic characterization of the melts. Due to the high strain hardening of the Pom-Poms, brittle fracture is observed at higher strains and strain rates, which is well described by the entropic fracture criterion.


Verlagsausgabe §
DOI: 10.5445/IR/1000158510
Veröffentlicht am 22.06.2023
Originalveröffentlichung
DOI: 10.1007/s00397-023-01393-0
Scopus
Zitationen: 9
Web of Science
Zitationen: 9
Dimensions
Zitationen: 9
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 0035-4511, 1435-1528
KITopen-ID: 1000158510
Erschienen in Rheologica Acta
Verlag Springer
Band 62
Seiten 269–283
Vorab online veröffentlicht am 05.04.2023
Nachgewiesen in Dimensions
Scopus
Web of Science
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