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Experimental Polymer Mechanochemistry and its Interpretational Frameworks.

Sergey Akbulatov1, Roman Boulatov1

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Polymer mechanochemistry explores how stretching polymers affects their reactivity. This review systematizes observations and proposes a framework for a more quantitative understanding of this emerging scientific field.

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Area of Science:

  • Polymer mechanochemistry bridges chemistry, materials science, physics, and engineering.

Background:

  • Mechanical forces induce unique reactivities in polymer chains under non-equilibrium conditions.
  • Mechanochemical phenomena are observed in bulk polymers under load and in flowing/sonicated solutions.
  • Empirical progress in polymer mechanochemistry has outpaced theoretical frameworks.

Purpose of the Study:

  • To systematize macroscopic manifestations of polymer mechanochemistry.
  • To critically assess existing molecular rationalizations from a physical chemistry perspective.
  • To propose a hierarchy of mechanochemical phenomena for multiscale modeling.

Main Methods:

  • Systematic review of empirical data on polymer mechanochemistry.
  • Critical assessment of physical chemistry principles applied to mechanochemical observations.
  • Analysis of quantification and validation methods, especially for sonicated solutions.

Main Results:

  • A proposed hierarchy of mechanochemical phenomena to guide multiscale modeling.
  • Identification of limitations in current approaches to quantifying mechanochemical reactivity.
  • Highlighting outstanding questions for the field's advancement.

Conclusions:

  • Polymer mechanochemistry requires rigorous, quantitative understanding.
  • Addressing 7 key problems can significantly advance the field.
  • Developing multiscale models analogous to the Eyring equation is crucial.