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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

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Two glass transitions in miscible polymer blends?

Jacek Dudowicz¹, Jack F Douglas², Karl F Freed¹

¹The James Franck Institute and the Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, USA.

The Journal of Chemical Physics

|July 3, 2014

Summary

Miscible polymer blends show distinct dynamics, unlike small molecules. This study presents a quantitative theory explaining these complex behaviors in real polymer systems.

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Area of Science:

Polymer Science
Materials Science
Physical Chemistry

Background:

Miscible polymer blends often display multiple structural relaxation times and glass transition temperatures, deviating from small molecule mixtures.
Existing qualitative explanations rely on phenomenological models of local concentration fluctuations, assuming ideal mixing due to chain connectivity.

Purpose of the Study:

To develop a quantitative theory for understanding the dynamics of real, non-ideal miscible polymer blends.
To provide a theoretical framework that explains the observed multiple relaxation times and glass transition temperatures.

Main Methods:

Synthesizing the lattice cluster theory (LCT) for blend thermodynamics.
Integrating the generalized entropy theory (GET) for polymer glass-formation.
Applying Kirkwood-Buff (KB) theory to analyze concentration fluctuations in binary mixtures.

Main Results:

The developed theory quantitatively explains the dynamic behaviors observed in real miscible polymer blends.
The model accounts for deviations from ideal mixing, providing a more accurate description of polymer blend dynamics.
Successfully integrates thermodynamic and dynamic theories for a comprehensive understanding.

Conclusions:

The quantitative theory offers a robust explanation for the complex dynamics of miscible polymer blends.
This approach bridges the gap between ideal models and real-world polymer systems.
Provides a foundation for predicting and designing polymer blend properties.