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Shear-Induced Heterogeneity in Associating Polymer Gels: Role of Network Structure and Dilatancy

Omar, Ahmad K. and Wang, Zhen-Gang (2017) Shear-Induced Heterogeneity in Associating Polymer Gels: Role of Network Structure and Dilatancy. Physical Review Letters, 119 (11). Art. No. 117801. ISSN 0031-9007. doi:10.1103/PhysRevLett.119.117801. https://resolver.caltech.edu/CaltechAUTHORS:20170913-100922884

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Abstract

We study associating polymer gels under steady shear using Brownian dynamics simulation to explore the interplay between the network structure, dynamics, and rheology. For a wide range of flow rates, we observe the formation of shear bands with a pronounced difference in shear rate, concentration, and structure. A striking increase in the polymer pressure in the gradient direction with shear, along with the inherently large compressibility of the gels, is shown to be a crucial factor in destabilizing homogeneous flow through shear-gradient concentration coupling. We find that shear has only a modest influence on the degree of association, but induces marked spatial heterogeneity in the network connectivity. We attribute the increase in the polymer pressure (and polymer mobility) to this structural reorganization.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/PhysRevLett.119.117801DOIArticle
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.117801PublisherArticle
ORCID:
AuthorORCID
Omar, Ahmad K.0000-0002-6404-7612
Wang, Zhen-Gang0000-0002-3361-6114
Additional Information:© 2017 American Physical Society. Received 8 July 2016; revised manuscript received 23 April 2017; published 12 September 2017. We thank John Brady and Marco Heinen for fruitful discussions. A. K. O. acknowledges support by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1144469 and an HHMI Gilliam Fellowship.
Funders:
Funding AgencyGrant Number
NSF Graduate Research FellowshipDGE-1144469
Howard Hughes Medical Institute (HHMI)UNSPECIFIED
Issue or Number:11
DOI:10.1103/PhysRevLett.119.117801
Record Number:CaltechAUTHORS:20170913-100922884
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170913-100922884
Official Citation:Shear-Induced Heterogeneity in Associating Polymer Gels: Role of Network Structure and Dilatancy Ahmad K. Omar and Zhen-Gang Wang Phys. Rev. Lett. 119, 117801 – Published 12 September 2017
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81404
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 Sep 2017 22:32
Last Modified:15 Nov 2021 19:43

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