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Interfacial Mechanophore Activation Using Laser-Induced Stress Waves.

Jaeuk Sung, Maxwell J Robb, Scott R White

    Journal of the American Chemical Society
    |March 30, 2018
    PubMed
    Summary

    Researchers developed a new method to study mechanochemical reactions at solid surfaces. They observed that maleimide-anthracene mechanophores on silica-polymer interfaces activate collectively with film spallation above 149 MPa.

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    Area of Science:

    • Materials Science
    • Polymer Chemistry
    • Surface Science

    Background:

    • Mechanochemistry enables chemical transformations through mechanical force.
    • Understanding interfacial mechanochemistry is crucial for designing advanced materials.
    • Existing methods often lack precision in controlling and characterizing interfacial reactions.

    Purpose of the Study:

    • To develop and validate a novel methodology for activating and characterizing mechanochemical transformations at a solid-polymer interface.
    • To investigate the mechanical threshold and reaction mechanism of maleimide-anthracene mechanophores at the fused silica-polymer interface.
    • To compare interfacial mechanochemical activation with that in solution or bulk polymers.

    Main Methods:

    • Utilizing laser-induced stress waves to generate controlled mechanical force at the interface.
    • Covalently anchoring maleimide-anthracene mechanophores at the fused silica-polymer interface.
    • Employing fluorescence microscopy, X-ray photoelectron spectroscopy (XPS), and Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) for characterization.

    Main Results:

    • Mechanophore activation was observed above a threshold stress of 149 MPa, linked to spallation of the polymer film.
    • The retro [4+2] cycloaddition reaction of the mechanophore was confirmed using multiple analytical techniques.
    • Control experiments demonstrated that covalent attachment is essential for interfacial activation, with no activation observed in non-anchored specimens.
    • Interfacial activation occurred collectively with film spallation, differing from the proportional stress-dependent activation seen in bulk materials.

    Conclusions:

    • A robust methodology for studying interfacial mechanochemistry using laser-induced stress waves has been established.
    • The study reveals a distinct, collective activation mechanism for interfacial mechanophores, triggered by polymer film spallation.
    • This work provides fundamental insights into stress-dependent chemical reactions at solid-polymer interfaces, paving the way for new material designs.