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Approaches to Polymeric Mechanochromic Materials

Calvino, Céline ; Neumann, Laura ; Weder, Christoph ; Schrettl, Stephen

In: Journal of Polymer Science, Part A: Polymer Chemistry, 2017, p. 640-652

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...

Mechano- and Thermoresponsive Photoluminescent Supramolecular Polymer

Lavrenova, Anna ; Balkenende, Diederik W. R. ; Sagara, Yoshimitsu ; Schrettl, Stephen ; Simon, Yoan C. ; Weder, Christoph

In: Journal of the American Chemical Society, 2017, p. 4302-4305

Quantitative Nano-characterization of Polymers Using Atomic Force Microscopy

Radion, Milad ; Kozhuharov, Svilen ; Kong, Phally ; di Giannantonio, Michela ; Ayer, Mathieu A. ; Maroni, Plinio ; Kilbinger, Andreas F. M. ; Fromm, Katharina M. ; Weder, Christoph ; Borkovec, Michal

In: CHIMIA, 2017, p. 195-198

A mechano- and thermoresponsive luminescent cyclophane

Sagara, Yoshimitsu ; Simon, Yoan C. ; Tamaoki, Nobuyuki ; Weder, Christoph

In: Chemical Communications, 2016, vol. 52, p. 5694–5697

The first fluorescent cyclophane with mechano- and thermoresponsive solid-state fluorescence characteristics is reported. The new cyclophane comprises two 9,10-bis(phenylethynyl)anthracene moieties that are bridged by tetraethylene glycol spacers. The stimuli-responsiveness is based on molecular assembly changes.

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...

Temperature-Dependent Mechanochromic Behavior of Mechanoresponsive Luminescent Compounds

Sagara, Yoshimitsu ; Kubo, Kazuya ; Nakamura, Takayoshi ; Tamaoki, Nobuyuki ; Weder, Christoph

In: Chemistry of Materials, 2017, vol. 29, no. 3, p. 1273-1278

Asymmetric Cyclophanes Permit Access to Supercooled Nematic Liquid Crystals with Stimuli-responsive Luminescence

Sagara, Yoshimitsu ; Weder, Christoph ; Tamaoki, Nobuyuki

In: Chemistry of Materials, 2017, vol. 29, no. 14, p. 6145-6152

Elucidating the potential biological impact of cellulose nanocrystals

Camarero-Espinosa, Sandra ; Endes, Carola ; Mueller, Silvana ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara ; Weder, Christoph ; Clift, Martin James David ; Foster, E. Johan

In: Fibers, 2016, vol. 4, no. 3, p. 21

Cellulose nanocrystals exhibit an interesting combination of mechanical properties and physical characteristics, which make them potentially useful for a wide range of consumer applications. However, as the usage of these bio-based nanofibers increases, a greater understanding of human exposure addressing their potential health issues should be gained. The aim of this perspective is to...

Light-Activated Healing of Metallosupramolecular Polymers

Fiore, Gina L. ; Rowan, Stuart J. ; Weder, Christoph

In: CHIMIA International Journal for Chemistry, 2011, vol. 65, no. 9, p. 745