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Optimal Molecular Dynamics System Size for Increased Precision and Efficiency for Epoxy Materials.

Khatereh Kashmari¹, Sagar U Patil¹, Josh Kemppainen¹

¹Michigan Technological University, Houghton, Michigan 49931, United States.

The Journal of Physical Chemistry. B

|April 22, 2024

Summary

Molecular dynamics simulations require optimal model sizes for efficient predictions. An epoxy resin model with 15,000 atoms balances simulation speed and accuracy for thermo-mechanical properties.

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Area of Science:

Materials Science
Computational Chemistry
Polymer Science

Background:

Molecular dynamics (MD) simulations are crucial for predicting polymer resin properties.
Accurate predictions require multiple simulations (replicates) due to the statistical nature of nanoscale materials.
Current literature lacks clear guidelines on MD model size versus prediction precision.

Purpose of the Study:

To determine the optimal molecular dynamics model size for epoxy resins.
To balance simulation efficiency (speed) with prediction precision.
To inform the design of advanced composite materials.

Main Methods:

Conducted molecular dynamics (MD) simulations of epoxy resin.
Varied the size of the MD models (number of atoms) to assess impact on results.
Analyzed the precision and simulation time for different model sizes.

Main Results:

An MD model size of 15,000 atoms achieved the fastest simulation times.
This model size did not compromise the precision of predicted thermo-mechanical properties.
Key properties predicted include mass density, elastic behavior, strength, and thermal characteristics.

Conclusions:

15,000 atoms is identified as the optimal MD model size for epoxy resin simulations.
This finding supports efficient computational process modeling and integrated computational materials engineering (ICME).
Enables the design of next-generation composite materials for demanding applications.