Control of hierarchical polymer mechanics with bioinspired metal-coordination dynamics
| Autor: | Robert Learsch, Niels Holten-Andersen, Scott C. Grindy, Devin G. Barrett, Davoud Mozhdehi, Jing Cheng, Phillip B. Messersmith, Zhibin Guan |
|---|---|
| Přispěvatelé: | Massachusetts Institute of Technology. Department of Materials Science and Engineering, Grindy, Scott Charles, Learsch, Robert W., Holten-Andersen, Niels |
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Polymers 02 engineering and technology 010402 general chemistry Branching (polymer chemistry) 01 natural sciences Viscoelasticity Article Metal chemistry.chemical_compound Copolymer General Materials Science Nanoscience & Nanotechnology chemistry.chemical_classification Spatial structure Viscosity Mechanical Engineering Hydrogels General Chemistry Polymer Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Elasticity 0104 chemical sciences chemistry Mechanics of Materials Metals visual_art Self-healing hydrogels visual_art.visual_art_medium 0210 nano-technology Ethylene glycol |
| Zdroj: | PMC Nature materials, vol 14, iss 12 Nature materials |
| Popis: | 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. National Science Foundation (U.S.) (Award DMR-0819762) National Science Foundation (U.S.) (Award DMR-1419807) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|