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Reliable Mechanochemistry: Protocols for Reproducible Outcomes of Neat and Liquid Assisted Ball-mill Grinding Experiments

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Published on: January 23, 2018

Mechanochemistry: the effect of dynamics.

Hans S Smalø¹, Vladimir V Rybkin, Wim Klopper

¹Centre for Theoretical and Computational Chemistry, Department of Chemistry, University of Oslo , P.O. Box 1033, N-0315 Oslo, Norway.

The Journal of Physical Chemistry. A

|August 9, 2014

Summary

Investigating polymer mechanochemistry, this study reveals force application method dictates bond breaking location in alkane chains. Molecular dynamics simulations show dynamic states, not statistical theory, accurately predict bond dissociation rates.

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Area of Science:

Polymer Science
Computational Chemistry
Materials Science

Background:

Mechanochemistry explores chemical bond reactions under mechanical force.
Linear alkane chains mimic polyethylene, a widely used polymer.
Understanding polymer chain dynamics is crucial for material durability.

Purpose of the Study:

To investigate the dynamical effects on the mechanochemistry of linear alkane chains.
To compare simulation results with transition-state theory predictions.
To evaluate the suitability of simplified models for large polymer systems.

Main Methods:

Molecular dynamics (MD) simulations were employed.
Density-functional theory (DFT) was used for smaller alkanes (butane, octane).
A one-dimensional linear chain of Morse potentials (LCM) model was used for longer chains.

Main Results:

Fixed force application favors terminal C-C bond cleavage.
Sudden force application favors central C-C bond breaking.
MD simulations showed lower bond-breaking rates than transition-state theory, linked to vibrational modes.

Conclusions:

The method of force application significantly influences bond scission sites in polymer chains.
Dynamic vibrational states, particularly symmetric modes, are key to bond dissociation.
The LCM model provides a computationally efficient and qualitatively accurate approach for studying long polymer mechanochemistry.