Flow Behavior of Chain and Star Polymers and Their Mixtures

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.

Autoren

Deepika Srivastva
Arash Nikoubashman

DOI

10.3390/polym10060599

eISSN

2073-4360

Ausgabe der Veröffentlichung

6

Zeitschrift

Polymers

Sprache

en

Online publication date

2018

Paginierung

599 - 599

Status

Published online

Herausgeber

MDPI AG

Herausgeber URL

http://dx.doi.org/10.3390/polym10060599

Datum der Datenerfassung

2024

Titel

Flow Behavior of Chain and Star Polymers and Their Mixtures

Ausgabe der Zeitschrift

10

Datenquelle: Crossref

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.

Addresses

Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany. ddeepika@uni-mainz.de.

Autoren

Deepika Srivastva
Arash Nikoubashman

DOI

10.3390/polym10060599

eISSN

2073-4360

Externe Identifier

PubMed Identifier: 30966633
PubMed Central ID: PMC6403976

Funding acknowledgements

Deutsche Forschungsgemeinschaft: NI 1487/2-1
Deutsche Forschungsgemeinschaft: SFB TRR146

Open access

true

ISSN

2073-4360

Ausgabe der Veröffentlichung

6

Zeitschrift

Polymers

Sprache

eng

Medium

Electronic

Online publication date

2018

Open access status

Open Access

Paginierung

E599

Datum der Veröffentlichung

2018

Status

Published

Publisher licence

CC BY

Datum der Datenerfassung

2019

Titel

Flow Behavior of Chain and Star Polymers and Their Mixtures.

Sub types

research-article
Journal Article

Ausgabe der Zeitschrift

10

Files

https://www.mdpi.com/2073-4360/10/6/599/pdf?version=1527592047 https://europepmc.org/articles/PMC6403976?pdf=render

Datenquelle: Europe PubMed Central

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.

Date of acceptance

2018

Autoren

Deepika Srivastva
Arash Nikoubashman

Autoren-URL

https://www.ncbi.nlm.nih.gov/pubmed/30966633

DOI

10.3390/polym10060599

eISSN

2073-4360

Externe Identifier

PubMed Central ID: PMC6403976

Funding acknowledgements

Deutsche Forschungsgemeinschaft: NI 1487/2-1
Deutsche Forschungsgemeinschaft: SFB TRR146

Ausgabe der Veröffentlichung

6

Zeitschrift

Polymers (Basel)

Schlüsselwörter

Poiseuille flow
chains
microfluidics
polymers
separation
simulations
stars

Sprache

eng

Country

Switzerland

PII

polym10060599

Datum der Veröffentlichung

2018

Status

Published online

Titel

Flow Behavior of Chain and Star Polymers and Their Mixtures.

Sub types

Journal Article

Ausgabe der Zeitschrift

10

Datenquelle: PubMed

Author's licence

CC-BY

Autoren

Deepika Srivastva
Arash Nikoubashman

Hosting institution

Universitätsbibliothek Mainz

Sammlungen

JGU-Publikationen

Resource version

Published version

DOI

10.3390/polym10060599

Funding acknowledgements

DFG, Open Access-Publizieren Universität Mainz / Universitätsmedizin

File(s) embargoed

false

Open access

true

ISSN

2073-4360

Ausgabe der Veröffentlichung

6

Zeitschrift

Polymers

Schlüsselwörter

530 Physik
530 Physics

Sprache

eng

Open access status

Open Access

Paginierung

Art. 599

Datum der Veröffentlichung

2018

Public URL

https://openscience.ub.uni-mainz.de/handle/20.500.12030/654

Herausgeber

MDPI

Herausgeber URL

http://dx.doi.org/10.3390/polym10060599

Datum der Datenerfassung

2018

Datum, an dem der Datensatz öffentlich gemacht wurde

2018

Zugang

Public

Titel

Flow behavior of chain and star polymers and their mixtures

Ausgabe der Zeitschrift

10

Files

58246.pdf

Datenquelle: OPENSCIENCE.UB

Flow Behavior of Chain and Star Polymers and Their Mixtures

Files

Files

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