Nonlinear shear data of an unentangled polystyrene melt [ Santangelo, P. G.; et al. 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.; et al. 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.
Origin of Shear Thinning in Unentangled Polystyrene Melts / Ianniruberto, G.; Marrucci, G.. - In: MACROMOLECULES. - ISSN 0024-9297. - 53:4(2020), pp. 1338-1345. [10.1021/acs.macromol.9b02330]
Origin of Shear Thinning in Unentangled Polystyrene Melts
Ianniruberto G.
;Marrucci G.
2020
Abstract
Nonlinear shear data of an unentangled polystyrene melt [ Santangelo, P. G.; et al. 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.; et al. 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
