Siloxane Supramolecular Elastomer Underwater Self-Healing
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Solution Overview
Problem
Conventional self-healable materials fail to perform self-healing in moist environments due to hydrogen bonding inhibition by water, which limits their application in aqueous conditions.
Innovation Solution
A supramolecular elastomer is developed through hydrogen bonding assisted multiphase assembly of three-arm siloxane oligomers, allowing water permeability to facilitate reversible hydrogen bonding while preventing violent hydration, enabling reliable underwater self-healing and shape memory properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogen bonding is used for self-healing in conventional materials, then self-healing ability is achieved, but the material cannot heal in moist environments or under water because water competes for hydrogen bonding
Solution Approach 1:
The patent introduces siloxane oligomers as intermediary components that mediate between the hydrogen bonding motifs and the aqueous environment. The siloxane backbone provides a hydrophobic shield that protects the hydrogen bonding groups from direct water competition while still allowing the self-healing mechanism to function. This intermediary structure enables the material to maintain hydrogen bonding integrity in wet conditions.
Solution Approach 2:
The patent creates local hydrophobic microenvironments within the material structure where hydrogen bonding occurs, isolated from the bulk aqueous environment. By concentrating hydrogen bonding motifs in protected domains with siloxane matrices, the material achieves localized self-healing capability that is shielded from water interference, while the overall material can still interact with aqueous environments.
2Adaptability or versatility
If water permeability is increased to enable underwater healing, then self-healing in aqueous environment is facilitated, but violent hydration may occur that inhibits hydrogen bonding
Solution Approach 1:
The siloxane oligomer chains form flexible protective shells around the hydrogen bonding motifs, allowing controlled water permeability. These flexible structures permit sufficient water access to enable hydrolysis and self-healing reactions while maintaining a protective barrier that prevents excessive water penetration and violent hydration that would disrupt hydrogen bonding stability.
Solution Approach 2:
The patent modifies the chemical parameters of the material by incorporating siloxane groups with specific hydrophobicity and water permeability characteristics. By adjusting the siloxane oligomer structure and composition, the material achieves optimal balance between water permeability (enabling healing) and water resistance (protecting hydrogen bonding), creating a tuned parameter regime for underwater self-healing.
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 material achieves effective self-healing and shape memory properties in aqueous environments, maintaining structural integrity and mechanical stability, and can be used as a strong adhesive or coating with improved healing efficiency and recyclability.
Implementation Method 1
hydrogen bonding assisted multiphase assembly of three-arm siloxane oligomers
Implementation Method 2
preventing violent hydration
Implementation Method 3
allowing water permeability to facilitate reversible hydrogen bonding
Data Source
AI summary
The present invention has provided a self-healable material configured to self-heal in the presence of moisture or in aqueous condition environment after physical damages. The material includes or made from a compound of formula IV