Dynamics of Supramolecular Self-Healing Recovery in Extension

Zachary R. Hinton, Aamir Shabbir, Nicolas J. Alvarez*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Self-healing materials are prized for their ability to recover mechanical properties after damage. Supramolecular polymer networks have been demonstrated to have the ability to recover without the need for extraneous material components or the use of external stimuli. Surprisingly, there is little quantitative measure of self-healing dynamics and recovery. In this work, we develop a tool using a filament stretching rheometer to probe self-healing dynamics in creep and constant rate of extension. We experimentally determine the effect of process time scales, τ H and τ W , on the degree of recovery for two distinct supramolecular architectures. These results are put into the context of molecular time scales such as disengagement time, the Rouse time, and bond lifetime. We find that entangled polymers undergo sequential healing, whereby at short times, dynamics are dominated by entanglement recovery followed by recovery of associations. For an unentangled polymer, recovery is seemingly dominated by association dynamics. Our experimental results are put into the context of leading theoretical models. We also introduce the importance of the measurement flow time scale on perceived material recovery. These initial results and reliable experimental tools begin to construct a framework for measuring, understanding, and predicting recovery of self-healing soft materials.

Original languageEnglish
JournalMacromolecules
Volume52
Issue number6
Pages (from-to)2231-2242
ISSN0024-9297
DOIs
Publication statusPublished - 2019

Cite this

Hinton, Zachary R. ; Shabbir, Aamir ; Alvarez, Nicolas J. / Dynamics of Supramolecular Self-Healing Recovery in Extension. In: Macromolecules. 2019 ; Vol. 52, No. 6. pp. 2231-2242.
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title = "Dynamics of Supramolecular Self-Healing Recovery in Extension",
abstract = "Self-healing materials are prized for their ability to recover mechanical properties after damage. Supramolecular polymer networks have been demonstrated to have the ability to recover without the need for extraneous material components or the use of external stimuli. Surprisingly, there is little quantitative measure of self-healing dynamics and recovery. In this work, we develop a tool using a filament stretching rheometer to probe self-healing dynamics in creep and constant rate of extension. We experimentally determine the effect of process time scales, τ H and τ W , on the degree of recovery for two distinct supramolecular architectures. These results are put into the context of molecular time scales such as disengagement time, the Rouse time, and bond lifetime. We find that entangled polymers undergo sequential healing, whereby at short times, dynamics are dominated by entanglement recovery followed by recovery of associations. For an unentangled polymer, recovery is seemingly dominated by association dynamics. Our experimental results are put into the context of leading theoretical models. We also introduce the importance of the measurement flow time scale on perceived material recovery. These initial results and reliable experimental tools begin to construct a framework for measuring, understanding, and predicting recovery of self-healing soft materials.",
author = "Hinton, {Zachary R.} and Aamir Shabbir and Alvarez, {Nicolas J.}",
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Hinton, ZR, Shabbir, A & Alvarez, NJ 2019, 'Dynamics of Supramolecular Self-Healing Recovery in Extension', Macromolecules, vol. 52, no. 6, pp. 2231-2242. https://doi.org/10.1021/acs.macromol.8b02423

Dynamics of Supramolecular Self-Healing Recovery in Extension. / Hinton, Zachary R.; Shabbir, Aamir; Alvarez, Nicolas J.

In: Macromolecules, Vol. 52, No. 6, 2019, p. 2231-2242.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Dynamics of Supramolecular Self-Healing Recovery in Extension

AU - Hinton, Zachary R.

AU - Shabbir, Aamir

AU - Alvarez, Nicolas J.

PY - 2019

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N2 - Self-healing materials are prized for their ability to recover mechanical properties after damage. Supramolecular polymer networks have been demonstrated to have the ability to recover without the need for extraneous material components or the use of external stimuli. Surprisingly, there is little quantitative measure of self-healing dynamics and recovery. In this work, we develop a tool using a filament stretching rheometer to probe self-healing dynamics in creep and constant rate of extension. We experimentally determine the effect of process time scales, τ H and τ W , on the degree of recovery for two distinct supramolecular architectures. These results are put into the context of molecular time scales such as disengagement time, the Rouse time, and bond lifetime. We find that entangled polymers undergo sequential healing, whereby at short times, dynamics are dominated by entanglement recovery followed by recovery of associations. For an unentangled polymer, recovery is seemingly dominated by association dynamics. Our experimental results are put into the context of leading theoretical models. We also introduce the importance of the measurement flow time scale on perceived material recovery. These initial results and reliable experimental tools begin to construct a framework for measuring, understanding, and predicting recovery of self-healing soft materials.

AB - Self-healing materials are prized for their ability to recover mechanical properties after damage. Supramolecular polymer networks have been demonstrated to have the ability to recover without the need for extraneous material components or the use of external stimuli. Surprisingly, there is little quantitative measure of self-healing dynamics and recovery. In this work, we develop a tool using a filament stretching rheometer to probe self-healing dynamics in creep and constant rate of extension. We experimentally determine the effect of process time scales, τ H and τ W , on the degree of recovery for two distinct supramolecular architectures. These results are put into the context of molecular time scales such as disengagement time, the Rouse time, and bond lifetime. We find that entangled polymers undergo sequential healing, whereby at short times, dynamics are dominated by entanglement recovery followed by recovery of associations. For an unentangled polymer, recovery is seemingly dominated by association dynamics. Our experimental results are put into the context of leading theoretical models. We also introduce the importance of the measurement flow time scale on perceived material recovery. These initial results and reliable experimental tools begin to construct a framework for measuring, understanding, and predicting recovery of self-healing soft materials.

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