Self-restorable Core-shell Capsule with Solvent Distribution Control
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Solution Overview
Problem
Existing self-healing materials face limitations such as high costs for catalysts, limited physical property resilience due to interfacial heterogeneity, and reduced re-healing capabilities after initial repair.
Innovation Solution
A core-shell capsule design featuring a core with an oil, a solvent, and a water-insoluble polymer compound dissolved in the solvent, where the solvent has a distribution coefficient between 0.01 and 100, allowing the polymer compound to precipitate and restore the shell upon damage, enabling self-healing without degrading the core material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microcapsules containing monomers are used for self-healing thermosetting materials, then the damaged structure can be restored, but the physical property resilience only reaches about 75% due to interfacial heterogeneity at the healing site
Solution Approach 1:
The patent changes the chemical parameters of the core-shell capsule by using a water-insoluble polymer compound in the core that can undergo phase transition or chemical reaction upon shell damage. This allows the core material to flow out and fill the crack, restoring the capsule's integrity and achieving complete physical property resilience rather than limited recovery.
Solution Approach 2:
The patent employs a composite core-shell structure where the water-insoluble polymer core is combined with a specific shell material. This composite design enables the core to provide restorative material while the shell provides structural integrity, solving the interfacial heterogeneity problem that limited previous self-healing systems to only 75% resilience.
2Reliability
If microcapsules with monomers and catalyst particles are used for self-healing, then damage can be healed, but the catalyst is expensive and most of all, a portion of once healed is not available for re-healing
Solution Approach 1:
The patent extracts the catalyst from the self-healing system, eliminating the need for expensive catalyst particles. Instead, the water-insoluble polymer compound in the core directly provides the restorative function through its phase transition or dissolution properties, removing both the cost burden and the limitation on re-healing cycles.
Solution Approach 2:
The core-shell capsule is designed to be self-restoring through the inherent properties of the water-insoluble polymer compound in the core. When the shell is damaged, the core material automatically flows out to repair the crack without requiring external catalysts or additional chemical reactions, enabling unlimited re-healing cycles.
3Object-affected harmful factors
If the capsule shell is damaged by external impact or severe temperature change, then the core material may be exposed to degradation, but the invention aims to maintain core efficacy for a long time
Solution Approach 1:
The patent implements a protective shell surrounding the core material before any damage occurs. This shell acts as a barrier that prevents external impacts and temperature changes from directly exposing the core to degrading conditions, thereby maintaining core efficacy over extended periods.
Solution Approach 2:
The patent converts the potential harm of shell damage into a beneficial self-healing response. When the shell is cracked, the core material flows out to fill and seal the crack, transforming the damage event into an opportunity for self-repair that actually strengthens the capsule's protective function and extends its service life.
Data Source
AI summary
The present invention relates to a core-shell capsule comprising: a core comprising an oil, a solvent satisfying relational expression 1 below, and a water-insoluble polymer compound dissolved in the solvent; and a water-insoluble polymer shell enclosing the core.0.01≤CA/CB≤100 [Relational expression 1](in relational expression 1, CA/CB is the distribution coefficient of solvent, and when the solvent is dissolved in oil and water to reach equilibrium, CA is the concentration of the solvent dissolved in the oil and CB is the concentration of the solvent dissolved in water).