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Modeling elongational viscosity of polystyrene Pom-Pom/linear and Pom-Pom/star blends

Hirschberg, Valerian 1; Lyu, Shan 1,2; Schußmann, Max G. 1; Wilhelm, Manfred 1; Wagner, Manfred H.
1 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)
2 Institut für Angewandte Materialien – Mikrostruktur-Modellierung und Simulation (IAM-MMS), Karlsruher Institut für Technologie (KIT)

Abstract:

The elongational rheology of blends of a polystyrene (PS) Pom-Pom with two linear polystyrenes was recently reported by Hirschberg et al. (J. Rheol. 2023, 67:403–415). The Pom-Pom PS280k-2x22-22k with a self-entangled backbone (M$_{w,bb}$ = 280 kg/mol) and 22 entangled sidearms (M$_{w,a}$ = 22 kg/mol) at each of the two branch points was blended at weight fractions from 75 to 2 wt% with two linear polystyrenes (PS) having M$_w$ of 43 kg/mol (PS43k) and 90 kg/mol (PS90k), respectively. While the pure Pom-Pom shows strong strain hardening in elongational flow (SHF > 100), strain hardening (SHF > 10) is still observed in Pom-Pom/linear blends containing only 2 wt% of Pom-Pom. The elongational start-up viscosities of the blends with Pom-Pom weight fractions above 10 wt% are well described by the Molecular Stress Function (MSF) model, however, requiring two nonlinear fit parameters. Here we show that quantitative and parameter-free modeling of the elongational viscosity data is possible by the Hierarchical Multi-mode Molecular Stress Function (HMMSF) model based on the concepts of hierarchical relaxation and dynamic dilution. In addition, we investigated the elongational viscosity of a blend consisting of 20 wt% Pom-Pom PS280k-2x22-22k and 80 wt% of a PS star with 11 arms of M$_{w,a}$ = 25 kg/mol having a similar span molecular weight as PS43k and similar M$_{w,a}$ as the Pom-Pom. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000161523
Veröffentlicht am 21.08.2023
Originalveröffentlichung
DOI: 10.1007/s00397-023-01411-1
Scopus
Zitationen: 6
Web of Science
Zitationen: 6
Dimensions
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Institut für Angewandte Materialien – Mikrostruktur-Modellierung und Simulation (IAM-MMS)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2023
Sprache Englisch
Identifikator ISSN: 0035-4511, 1435-1528
KITopen-ID: 1000161523
Erschienen in Rheologica Acta
Verlag Springer
Band 62
Heft 9
Seiten 433–445
Vorab online veröffentlicht am 03.08.2023
Schlagwörter Pom-pom, Long-chain branching, Elongational viscosity, Strain hardening, Polymer blends, HMMSF model
Nachgewiesen in Dimensions
Scopus
Web of Science
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