Issue 26, 2022

Bond strength regime dictates stress relaxation behavior

Abstract

Reconfigurable polymer networks are gaining interest for their potential applications as self-healing, recyclable, and stimuli-responsive smart materials. Relating the bond strength of dynamic interactions to material properties including stress relaxation time and modulus is crucial for smart material design. In this work, in situ crosslinked transition metal–terpyridine reconfigurable networks were utilized to modulate the characteristic network stress relaxation time, τR. The use of stress relaxation experiments rather than oscillatory frequency sweeps allowed for the measurement of network bond dynamics across a wider dynamic range than has been previously reported. The stress relaxation time was shown to be tunable by metal center, counterion, and crosslink density. Remarkably, the network crosslinked with covalent-like ruthenium chloride–terpyridine interaction, while having a longer τR, was qualitatively similar to the other metal–ligand networks. Furthermore, the relaxation time was independent of crosslink density in strongly bonded networks, allowing for independent tunability of modulus and τR. In contrast, increasing crosslink density reduced τR in networks crosslinked with weaker interactions.

Graphical abstract: Bond strength regime dictates stress relaxation behavior

Supplementary files

Article information

Article type
Paper
Submitted
20 abr. 2022
Accepted
10 jun. 2022
First published
22 jun. 2022

Soft Matter, 2022,18, 4937-4943

Author version available

Bond strength regime dictates stress relaxation behavior

I. Sacligil, C. W. Barney, A. J. Crosby and G. N. Tew, Soft Matter, 2022, 18, 4937 DOI: 10.1039/D2SM00499B

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