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Title: Control of hierarchical polymer mechanics with bioinspired metal-coordination dynamics

Journal Article · · Nature Materials
DOI:https://doi.org/10.1038/nmat4401· OSTI ID:1467436
 [1];  [1];  [2];  [3];  [3];  [2];  [3];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering
  2. Univ. of California, Irvine, CA (United States). Dept. of Chemistry
  3. Northwestern Univ., Evanston, IL (United States). Dept. of Biomedical Engineering

In conventional polymer materials, mechanical performance is traditionally engineered via material structure, using motifs such as polymer molecular weight, polymer branching, or copolymer-block design1. 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 may inform the design of soft materials for use in complex mechanical environments.

Research Organization:
Univ. of California, Irvine, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-04ER46162
OSTI ID:
1467436
Journal Information:
Nature Materials, Vol. 14, Issue 12; ISSN 1476-1122
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 335 works
Citation information provided by
Web of Science

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Highly Stretchable Polymers: Mechanical Properties Improvement by Balancing Intra‐ and Intermolecular Interactions journal April 2019
Supramolecular Metallo-Bioadhesive for Minimally Invasive Use journal August 2016
Mixed Reversible Covalent Crosslink Kinetics Enable Precise, Hierarchical Mechanical Tuning of Hydrogel Networks journal March 2017
Bioinspired Underwater Adhesives by Using the Supramolecular Toolbox journal January 2018
Dynamic Coordination of Eu-Iminodiacetate to Control Fluorochromic Response of Polymer Hydrogels to Multistimuli journal January 2018
An Elastic Autonomous Self-Healing Capacitive Sensor Based on a Dynamic Dual Crosslinked Chemical System journal July 2018
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(De)bonding on Demand with Optically Switchable Adhesives journal April 2019
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Bioinspired Strategy to Reinforce Hydrogels via Cooperative Effect of Dual Physical Cross‐Linkers journal December 2019
A Multifunctional Metallohydrogel with Injectability, Self-Healing, and Multistimulus-Responsiveness for Bioadhesives journal August 2018
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