Origin of Shear Thinning in Unentangled Polystyrene Melts

Origin of Shear Thinning in Unentangled Polystyrene Melts

Nonlinear shear data of an unentangled polystyrene melt [ Santangelo, P. G. ; J. Rheol. 2001, 45­(2), 583−594 ] are compared to Brownian dynamics predictions of Fraenkel chains. All parameters needed to perform the comparison are obtained from the known molar mass, zero-shear viscosity, and from old...

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Veröffentlicht in:Macromolecules 2020-02, Vol.53 (4), p.1338-1345
Hauptverfasser: Ianniruberto, Giovanni, Marrucci, Giuseppe
Format: Artikel
Sprache:eng
Schlagworte:
Physical Sciences
Polymer Science
Science & Technology
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Zusammenfassung:Nonlinear shear data of an unentangled polystyrene melt [ Santangelo, P. G. ; J. Rheol. 2001, 45­(2), 583−594 ] are compared to Brownian dynamics predictions of Fraenkel chains. All parameters needed to perform the comparison are obtained from the known molar mass, zero-shear viscosity, and from older data for the linear glassy contribution [ Inoue, T. ; Macromolecules 1991, 24­(20), 5670−5675 ]. Comparison reveals that the magnitude of shear thinning of the unentangled melt cannot be explained unless account is taken of the flow-induced reduction of the monomeric (Kuhn segment) friction coefficient.
ISSN:0024-9297
1520-5835
DOI:10.1021/acs.macromol.9b02330