Work

The Restoring Force Triangle: A Mnemonic Device for Polymer Mechanochemistry

Year: 2024

Type: article

Abstract: In polymer mechanochemistry, mechanophores are specific molecular units within the macromolecular backbone that are particularly sensitive to tension. To facilitate understanding of this selective responsiveness, we introduce the restoring force triangle (RFT). The RFT is a mnemonic device intended to provide intuitive insight into how external tensile forces (i.e., stretching) can selectively activate scissile bonds, thereby initiating mechanically driven chemical reactions. The RFT utilizes two easily computable parameters: the effective bond stiffness constant, which measures a bond's resistance to elongation, and the bond dissociation energy, which is the energy required to break a bond. These parameters help categorize reactivity into thermal and mechanical domains, providing a useful framework for developing new mechanophores that are responsive to force but thermally stable. The RFT helps chemists intuitively understand how tensile force contributes to the activation of a putative mechanophore, facilitating the development of mechanochemical reactions and mechano-responsive materials.

Source: Journal of the American Chemical Society

DOI: 10.1021/jacs.4c10346

Authors: Yunyan Sun, Fangbai Xie, Jeffrey S. Moore

Institution: University of Illinois Urbana-Champaign

Language: English

Topic: Polymer composites and self-healing

Subfield: Polymers and Plastics

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funder: Division of Chemistry

Award: G2391795087