Control of Imine Exchange Kinetics with Photoswitches to Modulate Self‐Healing in Polysiloxane Networks by Light Illumination. Issue 44 (8th July 2016)

• Record Type: Journal Article
• Authors: Kathan, Michael; Kovaříček, Petr; Jurissek, Christoph; Senf, Antti; Dallmann, Andre; Thünemann, Andreas F.; Hecht, Stefan
• Is Part Of: Angewandte Chemie international edition. Volume 55:Issue 44(2016)
• Page Start: 13882
• Page End: 13886
• Publication Date: 2016-07-08
• Subjects: adaptive materials -- diarylethenes -- dynamic covalent chemistry -- photochromism -- self-healing; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201605311
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Various aldehyde‐containing photoswitches have been developed whose reactivity toward amines can be controlled externally. A thermally stable bifunctional diarylethene, which in its ring‐closed form exhibits imine formation accelerated by one order of magnitude, was used as a photoswitchable crosslinker and mixed with a commercially available amino‐functionalized polysiloxane to yield a rubbery material with viscoelastic and self‐healing properties that can be reversibly tuned by irradiation. Abstract : Illuminating dynamic covalent chemistry ! A photoswitch, which makes it possible to modulate the reactivity of aldehyde functionalities by light irradiation, was developed to control the exchange kinetics in a dynamic imine‐based polysiloxane network. In this way soft materials were obtained with remote control over their intrinsic properties, most notably their ability to self‐heal.