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Force-dependent bond dissociation explains the rate-dependent fracture of vitrimers. | LitMetric

Force-dependent bond dissociation explains the rate-dependent fracture of vitrimers.

Soft Matter

Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093, USA. and Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093, USA.

Published: July 2021

AI Article Synopsis

Article Abstract

We investigate the rate-dependent fracture of vitrimers by conducting a tear test. Based on the relationship between the fracture energy and the thickness of vitrimer films, we, for the first time, obtain the intrinsic fracture energy and bulk dissipation of vitrimers during crack extension. The intrinsic fracture energy strongly depends on tear speed, and such dependence can be well explained by Eyring theory. In contrast, the bulk dissipation only weakly depends on tear speed, which is drastically different from observations on traditional viscoelastic polymers. We ascribe such a weak rate-dependence to the strong force-sensitivity of the exchange reaction of the dynamic covalent bond in the vitrimer.

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Source
http://dx.doi.org/10.1039/d1sm00518aDOI Listing

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