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Authors: Srivastva, Deepika
Nikoubashman, Arash
Title: Flow behavior of chain and star polymers and their mixtures
Online publication date: 14-Jun-2018
Year of first publication: 2018
Language: english
Abstract: Star-shaped polymers show a continuous change of properties from flexible linear chains to soft colloids, as the number of arms is increased. to investigate the effect of macromolecular architecture on the flow properties, we employ computer simulations of single chain and star polymers as well as of their mixtures under poiseuille flow. hydrodynamic interactions are incorporated through the multi-particle collision dynamics (mpcd) technique, while a bead-spring model is used to describe the polymers. for the ultradilute systems at rest, the polymers are distributed uniformly in the slit channel, with a weak dependence on their number of arms. once flow is applied, however, we find that the stars migrate much more strongly towards the channel center as the number of arms is increased. in the star-chain mixtures, we find a flow-induced separation between stars and chains, with the stars located in the channel center and the chains closer to the walls. in order to identify the origin of this flow-induced partitioning, we conduct additional simulations without hydrodynamic interactions, and find that the observed cross-stream migration originates from a combination of wall-induced hydrodynamic lift forces and viscoelastic effects. the results from our study give valuable insights for designing microfluidic devices for separating polymers based on their architecture.
DDC: 530 Physik
530 Physics
Institution: Johannes Gutenberg-Universität Mainz
Department: FB 08 Physik, Mathematik u. Informatik
Place: Mainz
Version: Published version
Publication type: Zeitschriftenaufsatz
License: CC BY
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Journal: Polymers
Pages or article number: Art. 599
Publisher: MDPI
Publisher place: Basel
Issue date: 2018
ISSN: 2073-4360
Publisher URL:
Publisher DOI: 10.3390/polym10060599
Appears in collections:JGU-Publikationen

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