Imaging the Molecular Motions of Autonomous Repair in a Self-Healing Polymer

Hanne M. van der Kooij, Arijana Susa, Santiago J. García, Sybrand van der Zwaag, Joris Sprakel

Research output: Contribution to journalArticleScientificpeer-review

26 Citations (Scopus)

Abstract

Self-healing polymers can significantly extend the service life of materials and structures by autonomously repairing damage. Intrinsic healing holds great promise as a design strategy to mitigate the risks of damage by delaying or preventing catastrophic failure. However, experimentally resolving the microscopic mechanisms of intrinsic repair has proven highly challenging. This work demonstrates how optical micromechanical mapping enables the quantitative imaging of these molecular-scale dynamics with high spatiotemporal resolution. This approach allows disentangling delocalized viscoplastic relaxation and localized cohesion-restoring rebonding processes that occur simultaneously upon damage to a self-healing polymer. Moreover, frequency- and temperature-dependent imaging provides a way to pinpoint the repair modes in the relaxation spectrum of the quiescent material. These results give rise to a complete picture of autonomous repair that will guide the rational design of improved self-healing materials.

Original languageEnglish
Article number1701017
Number of pages6
JournalAdvanced Materials
Volume29
Issue number26
DOIs
Publication statusPublished - 2017

Keywords

  • Laser speckle Imaging
  • Nonlinear mechanics
  • Polymer dynamics
  • Self-healing
  • Thermoplastic elastomers

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