Mobile-Joint Hop-Ring Hydrogels for Stretchability and Toughness
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Solution Overview
Problem
Existing polymeric networks suffer from early fracture of covalent linkers, weak bonding strength, and limited molecular mobility or chain flexibility, restricting their stretchability and toughness.
Innovation Solution
A rotaxane composition comprising macrocyclic rings and macrocycle-binding moieties reversibly threaded onto polymers, forming a network with mobile joints through non-covalent interactions, allowing for ring-hopping mechanisms that enhance stretchability and toughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If covalent linkers are used to form polymeric networks, then bonding strength is improved, but early fracture occurs and molecular mobility is limited
Solution Approach 1:
The patent employs dynamic covalent chemistry with reversible imine bonds that can break and reform under stress. This dynamic character allows the network to adapt to applied forces, preventing catastrophic failure while maintaining strong bonding. The reversible nature enables bond exchange that distributes stress throughout the network, resolving the contradiction between strong bonding and fracture resistance.
Solution Approach 2:
The patent changes the chemical parameters of the bonding system by using imine bonds with specific equilibrium constants and exchange rates. By tuning the imine bond stability and exchange kinetics, the network achieves both strong bonding under normal conditions and controlled bond breaking under stress, preventing early fracture while maintaining structural integrity.
2Strength
If covalent linkers are used to form polymeric networks, then bonding strength is improved, but chain flexibility is limited
Solution Approach 1:
The dynamic covalent imine bonds enable continuous restructuring of the polymer network in response to environmental conditions and applied forces. This dynamic character provides chain flexibility and adaptability while maintaining strong bonding, as the bonds can rearrange to accommodate conformational changes without breaking the overall network structure.
3Ease of manufacture
If traditional hydrogel systems are used, then ease of manufacture is maintained, but stretchability and toughness are limited
Solution Approach 1:
The patent creates a composite hydrogel system combining polyacrylamide chains with imine bond-crosslinked networks. This composite structure integrates the ease of manufacturing of traditional hydrogels with the enhanced toughness provided by dynamic covalent bonding and network reconfigurability, achieving both manufacturing simplicity and superior mechanical properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The rotaxane composition achieves exceptional stretchability of over 500 times its length, ultra-high toughness of 90 MJ/m3, and optimal fracture toughness of 67 KJ/m2, surpassing previous hydrogel systems.
Implementation Method 1
forming a network with mobile joints through non-covalent interactions, allowing for ring-hopping mechanisms that enhance stretchability and toughness
Data Source
AI summary
The present disclosure pertains to a rotaxane composition that includes a plurality of macrocyclic rings, a plurality of macrocycle-binding moieties, and a plurality of first polymers and second polymers. The macrocyclic rings and macrocycle-binding moieties are reversibly threaded onto the first polymers. At least some of the macrocyclic rings are operational to unthread from one first polymer and rethread onto another first polymer or a second polymer. The present disclosure also pertains to methods of manufacturing a three-dimensional structure by applying a rotaxane composition onto a surface. The present disclosure also pertains to methods of forming the rotaxane compositions.