Mechanophores for Mechano‐Imaging in Polymeric Materials

ABSTRACT In many of their applications, polymeric materials are expected to withstand mechanical loads, yet the molecular‐scale processes that govern how stress localizes, redistributes, and ultimately leads to damage remain difficult to probe directly. Mechanophore‐based mechanochromic systems offer a powerful approach to address this challenge by converting mechanical input into optical signals detectable with spectroscopic and microscopic techniques. In this Perspective, we highlight recent progress in the use of mechanophores as probes for imaging mechanical processes in solid‐state polymers. We discuss how mechanophore activation can reveal molecular damage, stress localization, and time‐dependent deformation processes, and how emerging reversible and multiplexed, or multimodal systems extend mechano‐imaging to lower stress regimes. Finally, we outline key challenges for the field, including the development of new mechanophore scaffolds for quantitative mechano‐imaging and scalable reporter systems suitable for real materials and structural health monitoring. Together, these advances position mechanophore‐based mechano‐imaging as a promising framework for interrogating and ultimately controlling the distribution and dissipation of mechanical energy in polymeric materials.