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Shear localization in associating polymer gels

Wang, Zhen-Gang and Omar, Ahmad (2015) Shear localization in associating polymer gels. In: 250th American Chemical Society National Meeting & Exposition, August 16-20, 2015, Boston, MA.

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Despite the ubiquity of phys. crosslinked polymer gels in natural and synthetic systems, a fundamental understanding connecting the dynamics and microstructure to the bulk rheol. behavior under large deformations remains a challenging and open problem. To explore this connection, we perform startup shear computer simulations on phys. assocg. polymer gels and track the temporal and spatial dynamical and structural response. For deformation rates exceeding the characteristic relaxation time of the gel, we observe stress overshoot corresponding to network yielding. Upon yielding, cage breaking results in a significant decrease in the chain relaxation time, which is reflected in the enhanced chain diffusivity relative to the quiescent state. Below a crit. shear rate and upon yielding, we observe the formation of steady-state shear bands in the gradient direction that have a marked difference in the polymer concn. and are dynamically and structurally distinct.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription Website
Wang, Zhen-Gang0000-0002-3361-6114
Omar, Ahmad0000-0003-1871-9235
Additional Information:© 2015 American Chemical Society.
Record Number:CaltechAUTHORS:20150902-104745372
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60029
Deposited By: Tony Diaz
Deposited On:11 Sep 2015 18:34
Last Modified:09 Mar 2020 13:19

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