240509_poe-loop_0
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Mechanochromic Polyolefin Elastomers

DOKPE

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  • 2024
Submitted to:
  • ACS Applied Polymer Materials. - American Chemical Society. - 2024
English The optical detection of mechanical strain and stress in polymers is a powerful and convenient approach for studying deformation processes in these materials and identifying damage prior to failure in crucial components. We show here that mechanochromic behavior can be introduced via a straightforward one-step process that involves the modification of a commercial polyolefin elastomer (POE) grafted with reactive anhydride groups with small amounts (<0.8 wt%) of mechanochromic cross-linkers (Loop or sPDI). These motifs contain excimer-forming perylene diimides (PDIs) and react with POE to afford mechanochromic polyolefin elastomers (POE-Loop or POE-sPDI). The Loop motif contains two excimer-forming PDI moieties that can form folded structures in which the two PDIs within the Loop motif interact with each other, i.e. intra-Loop, while sPDI contains one PDI that can only form interactions with PDIs of other sPDI probes. Upon mechanical deformation of POE-Loop and POE-sPDI, the dye aggregates disassemble, and the ratio of monomer-to-excimer emission intensity increases. The data suggest that dye interactions between probes, i.e. inter-Loop or inter-sPDI, dominate the optical characteristics of both polymers.
Faculty
Faculté des sciences et de médecine
Department
AMI - Chimie des polymères et matériaux
Language
  • English
Classification
Chemistry
License
License undefined
Open access status
green
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/328611
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