Control of hierarchical polymer mechanics with bioinspired metal-coordination dynamics.


Journal Article

In conventional polymer materials, mechanical performance is traditionally engineered via material structure, using motifs such as polymer molecular weight, polymer branching, or block copolymer design. Here, by means of a model system of 4-arm poly(ethylene glycol) hydrogels crosslinked with multiple, kinetically distinct dynamic metal-ligand coordinate complexes, we show that polymer materials with decoupled spatial structure and mechanical performance can be designed. By tuning the relative concentration of two types of metal-ligand crosslinks, we demonstrate control over the material's mechanical hierarchy of energy-dissipating modes under dynamic mechanical loading, and therefore the ability to engineer a priori the viscoelastic properties of these materials by controlling the types of crosslinks rather than by modifying the polymer itself. This strategy to decouple material mechanics from structure is general and may inform the design of soft materials for use in complex mechanical environments. Three examples that demonstrate this are provided.

Full Text

Cited Authors

  • Grindy, SC; Learsch, R; Mozhdehi, D; Cheng, J; Barrett, DG; Guan, Z; Messersmith, PB; Holten-Andersen, N

Published Date

  • December 2015

Published In

Volume / Issue

  • 14 / 12

Start / End Page

  • 1210 - 1216

PubMed ID

  • 26322715

Pubmed Central ID

  • 26322715

International Standard Serial Number (ISSN)

  • 1476-1122

Digital Object Identifier (DOI)

  • 10.1038/nmat4401


  • eng