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Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules

Published on: April 28, 2014

Stress distributions in diblock copolymers.

P Maniadis¹, T Lookman, E M Kober

¹Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review Letters

|August 7, 2007

Summary

This study applies a generalized self-consistent field theory to AB diblock copolymers, revealing stress reductions at domain interfaces due to interfacial tension and chain connectivity effects in polymer melts.

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Area of Science:

Polymer Physics
Materials Science
Soft Matter Physics

Background:

Understanding the mechanical properties of polymer melts is crucial for material design.
Self-consistent field theory (SCFT) is a powerful tool for modeling polymer behavior.
Elastic stress and strain fields play a significant role in polymer morphology.

Purpose of the Study:

To apply a generalized SCFT, incorporating elastic stress and strain, to AB diblock copolymer melts.
To investigate the stress distributions within stable lamellar and hexagonal morphologies.
To elucidate the contributions of chain connectivity and interfacial tension to the overall stress profile.

Main Methods:

Development and application of a generalized self-consistent field theory.
Inclusion of elastic stress and strain fields within the theoretical framework.
Analysis of stress distributions under volume-conserving strain loadings for specific morphologies.

Main Results:

Local stress is reduced at the domain interface in AB diblock copolymer melts.
A slight enhancement of stress is observed in the immediate vicinity of the interface.
The overall stress profile results from a balance between chain connectivity (positive contribution) and interfacial tension (negative contribution).

Conclusions:

The generalized SCFT provides a robust framework for studying stress in polymer melts.
Interfacial tension significantly influences stress distribution, leading to localized reductions.
The interplay between chain connectivity and immiscibility governs the mechanical response of diblock copolymers.