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Toughening Self-Healing Elastomers with Chain Mobility. | LitMetric

Toughening Self-Healing Elastomers with Chain Mobility.

Adv Sci (Weinh)

School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.

Published: August 2024

AI Article Synopsis

  • * Raising temperature significantly improves the recovered work of fracture, facilitating better self-healing as more mobile polymer chains can reform bonds at broken interfaces.
  • * Optimal conditions promoting chain mobility, such as specific plasticizer content or temperature, lead to notable improvements in fracture toughness and highlight the importance of effective self-healing mechanisms in preventing damage.

Article Abstract

Enhancing fracture toughness and self-healing within soft elastomers is crucial to prolonging the operational lifetimes of soft devices. Herein, it is revealed that tuning the polymer chain mobilities of carboxylated-functionalized polyurethane through incorporating plasticizers or thermal treatment can enhance these properties. Self-healing is promoted as polymer chains gain greater mobility toward the broken interface to reassociate their bonds. Raising the temperature from 80 to 120 °C, the recovered work of fracture is increased from 2.86 to 123.7 MJ m. Improved fracture toughness is realized through two effects. First, strong carboxyl hydrogen bonds dissipate large energies when broken. Second, chain mobilities enable the redistribution of localized stress concentrations to allow crack blunting, enlarging the size of dissipation zones. At optimal conditions of plasticizers (3 wt.%) or temperature (40 °C) to promote chain mobilities, fracture toughness improves from 16.3 to 19.9 and 25.6 kJ m, respectively. Insights of fracture properties at healed soft interfaces are revealed through double cantilever beam tests. These measurements indicate that fracture mechanics play a critical role in delaying complete failure at partial self-healing. By imparting optimal polymer chain mobilities within tough and self-healing elastomers, effective prevention against damage and better recovery are realized.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11321685PMC
http://dx.doi.org/10.1002/advs.202308154DOI Listing

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