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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Strain localization in glassy polymers under cylindrical confinement.

Amit Shavit¹, Robert A Riggleman

¹Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA. rrig@seas.upenn.edu.

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|March 29, 2014

Summary

This summary is machine-generated.

Deforming polymer glasses at slower rates promotes shear banding, a key to their toughness. This phenomenon, observed in simulations, is linked to structural features frozen during preparation, independent of polymer chain length.

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Area of Science:

Materials Science
Polymer Physics
Computational Materials Science

Background:

Deformation mechanisms in crystalline materials are understood via dislocation motion.
Deformation mechanisms in amorphous materials, particularly glassy polymers, are less understood.
Distinguishing mechanical responses of organic versus polymer glasses is a key research gap.

Purpose of the Study:

To investigate the mechanical response of model glassy polymers under tensile deformation.
To explore the influence of cooling rate, deformation rate, and chain length on polymer glass behavior.
To understand the origins of shear banding in confined polymer glasses.

Main Methods:

Utilized molecular dynamics simulations for tensile deformation of nanoscopic polymer pillars.
Systematically varied parameters including chain length, glass cooling rate, and deformation rate.
Employed the isoconfigurational ensemble approach to analyze structural influences.

Main Results:

Slower cooling rates and slower deformation rates increase susceptibility to shear banding (strain localization).
Shear banding was observed in polymer glasses under cylindrical confinement, independent of chain length.
Structural features frozen during sample preparation were identified as the cause of shear band formation.

Conclusions:

The study provides direct evidence of shear banding in deformed polymer glasses under confinement.
Material preparation conditions (cooling rate) significantly influence deformation localization.
Frozen-in structural heterogeneities dictate the sites of shear band initiation.