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Rheologica Acta

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05-03-2018 | Original Contribution

Linear viscoelastic behavior of bidisperse polystyrene blends: experiments and slip-link predictions

Authors: Maria Katzarova, Teresita Kashyap, Jay D. Schieber, David C. Venerus

Published in: Rheologica Acta | Issue 4/2018

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Abstract

The linear viscoelastic behavior of three well-entangled linear monodisperse polystyrene melts and their blends is investigated. The monodisperse melts are blended in a 1:1 weight ratio to obtain three polystyrene bidisperse blends for which the linear viscoelastic behavior is also measured. Special attention is paid to controlling sample size and solvent content, and checking for consistency in the high-frequency regime. We also attempt to estimate uncertainty quantitatively. The experimental results agree well with the discrete slip-link model, a robust mesoscopic theory that has been successful in predicting the rheology of flexible entangled polymer liquids and gels. Using recently developed analytic expressions for the relaxation modulus, predictions of the monodisperse samples are made. The parameters for the model are obtained from the low-frequency crossover of one experiment. Using this parameter set without adjustment, predictions over the fully accessible experimental frequency range are obtained for the monodisperse samples and their blends with very good agreement.

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Title: Linear viscoelastic behavior of bidisperse polystyrene blends: experiments and slip-link predictions
Authors: Maria Katzarova
Teresita Kashyap
Jay D. Schieber
David C. Venerus
Publication date: 05-03-2018
Publisher: Springer Berlin Heidelberg
Published in: Rheologica Acta / Issue 4/2018
Print ISSN: 0035-4511
Electronic ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-018-1079-7

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