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    Université de Fribourg

    Light-responsive azo-containing organogels

    Ayer, Mathieu A. ; Schrettl , Stephen ; Balog, Sandor ; Simon, Yoan C. ; Weder, Christoph

    In: Soft Matter, 2017, vol. 13, no. 22, p. 4017-4023

    While azo compounds are widely employed as radical initiators, they have rarely been used as stimuli-responsive motifs in macromolecular constructs. In this study, an azo-based cross-linker was prepared and reacted with poly(vinyl alcohol) to afford a series of stimuli-responsive organogels. Irradiation of these materials with UV light causes de-cross-linking and triggers a solid-to-liquid phase...

    Université de Fribourg

    Azo-Containing Polymers with Degradation On-Demand Feature

    Ayer, Mathieu A. ; Simon, Yoan C. ; Weder, Christoph

    In: Macromolecules, 2016, vol. 49, p. 2917–2927

    Molecules comprising aliphatic azo moieties are widely used as radical polymerization initiators, but only a few studies have explored their usefulness as stimuli-responsive motifs in macromolecular constructs. The controlled degradation of azo-containing polymers has indeed remained largely unexplored. Here we present the syntheses of linear azo-containing polyamides and polyurethanes and...

    Université de Fribourg

    Triggered metal ion release and oxidation: ferrocene as a mechanophore in polymers

    Giannantonio, Michela Di ; Ayer, Mathieu A. ; Verde-Sesto, Ester ; Lattuada, Marco ; Weder, Christoph ; Fromm, Katharina M.

    In: Angewandte Chemie International Edition, 2018, vol. 57, no. 35, p. 11445-11450

    The introduction of mechanophores into polymers makes it possible to transduce mechanical forces into chemical reactions that can be used to impart functions such as self‐healing, catalytic activity, and mechanochromic response. Here, an example of mechanically induced metal ion release from a polymer is reported. Ferrocene (Fc) was incorporated as an iron ion releasing mechanophore into...