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Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

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Molecular mobility in driven monomeric and polymeric glasses.

Jörg Rottler¹

¹Department of Physics and Astronomy and Quantum Matter Institute, University of British Columbia, Vancouver BC, Canada V6T 1Z1.

Physical Review. E

|August 17, 2018

Summary

This summary is machine-generated.

In flowing glasses, structural relaxation time (τ_str) universally relates to shear stress (σ) and strain rate (ε̇). This framework applies from the glass transition to the athermal limit, differing in polymers due to strain hardening.

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Area of Science:

Materials Science
Rheology
Condensed Matter Physics

Background:

Supercooled liquids and glasses exhibit complex flow behavior under stress.
Understanding the relationship between macroscopic deformation and microscopic dynamics is crucial for materials science.

Purpose of the Study:

To establish a universal relation for microscopic structural relaxation time (τ_str) in flowing glasses.
To investigate deviations from this relation in macromolecular (polymeric) glasses.

Main Methods:

Analysis of rheological data for monomeric and polymeric glasses under constant shear stress.
Development of theoretical expressions to model stress-strain relationships and relaxation times.

Main Results:

A universal relation, σ/G∞ε̇, was found for τ_str in monomeric glasses across various temperatures and limits.
In polymeric glasses, stress decouples from τ_str, with τ_str decreasing despite increasing stress during strain hardening.

Conclusions:

The study provides a unified framework for analyzing mobility in glassy materials.
The findings highlight distinct mechanical responses of monomeric versus polymeric glasses, crucial for predicting material behavior.