Chemical control of the viscoelastic properties of vinylogous urethane vitrimers

Wim Denissen, Martijn Droesbeke, Renaud Nicolaÿ, Ludwik Leibler, Johan M. Winne () and Filip E. Du Prez ()
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Wim Denissen: Polymer Chemistry Research Group and Laboratory for Organic Synthesis, Ghent University
Martijn Droesbeke: Polymer Chemistry Research Group and Laboratory for Organic Synthesis, Ghent University
Renaud Nicolaÿ: Matière Molle et Chimie, UMR 7167 CNRS-ESPCI, ESPCI ParisTech
Ludwik Leibler: Matière Molle et Chimie, UMR 7167 CNRS-ESPCI, ESPCI ParisTech
Johan M. Winne: Polymer Chemistry Research Group and Laboratory for Organic Synthesis, Ghent University
Filip E. Du Prez: Polymer Chemistry Research Group and Laboratory for Organic Synthesis, Ghent University

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Vinylogous urethane based vitrimers are polymer networks that have the intrinsic property to undergo network rearrangements, stress relaxation and viscoelastic flow, mediated by rapid addition/elimination reactions of free chain end amines. Here we show that the covalent exchange kinetics significantly can be influenced by combination with various simple additives. As anticipated, the exchange reactions on network level can be further accelerated using either Brønsted or Lewis acid additives. Remarkably, however, a strong inhibitory effect is observed when a base is added to the polymer matrix. These effects have been mechanistically rationalized, guided by low-molecular weight kinetic model experiments. Thus, vitrimer elastomer materials can be rationally designed to display a wide range of viscoelastic properties.

Date: 2017
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DOI: 10.1038/ncomms14857

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