Tough and stretchable ionogels by in situ phase separation

Meixiang Wang, Pengyao Zhang, Mohammad Shamsi, Jacob L. Thelen, Wen Qian, Vi Khanh Truong, Jinwoo Ma, Jian Hu, Michael D. Dickey

Research output: Contribution to journalArticlepeer-review

Abstract

Ionogels are compelling materials for technological devices due to their excellent ionic conductivity, thermal and electrochemical stability, and non-volatility. However, most existing ionogels suffer from low strength and toughness. Here, we report a simple one-step method to achieve ultra-tough and stretchable ionogels by randomly copolymerizing two common monomers with distinct solubility of the corresponding polymers in an ionic liquid. Copolymerization of acrylamide and acrylic acid in 1-ethyl-3-methylimidazolium ethyl sulfate results in a macroscopically homogeneous covalent network with in situ phase separation: a polymer-rich phase with hydrogen bonds that dissipate energy and toughen the ionogel; and an elastic solvent-rich phase that enables for large strain. These ionogels have high fracture strength (12.6 MPa), fracture energy (~24 kJ m−2) and Young’s modulus (46.5 MPa), while being highly stretchable (~600% strain) and having self-healing and shape-memory properties. This concept can be applied to other monomers and ionic liquids, offering a promising way to tune ionogel microstructure and properties in situ during one-step polymerization.

Original languageEnglish
Pages (from-to)359-365
Number of pages7
JournalNature Materials
Volume21
Issue number3
DOIs
Publication statusPublished - Mar 2022
Externally publishedYes

Keywords

  • Soft materials
  • Structural materials
  • Ionogels

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