Dynamics of vitrimers: defects as a highway to stress relaxation: Defects as a Highway to Stress Relaxation

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Abstract

We propose a coarse-grained model to investigate stress relaxation in star-polymer networks induced by dynamic bond-exchange processes. We show how the swapping mechanism, once activated, allows the network to reconfigure, exploring distinct topological configurations, all of them characterized by complete extent of reaction. Our results reveal the important role played by topological defects in mediating the exchange reaction and speeding up stress relaxation. The model provides a representation of the dynamics in vitrimers, a new class of polymers characterized by bond-swap mechanisms which preserve the total number of bonds, as well as in other bond-exchange materials.

Original languageEnglish
Article number058003
Number of pages5
JournalPhysical Review Letters
Volume121
Issue number5
DOIs
Publication statusPublished - 31 Jul 2018

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