Self-Healing Elastomer Capsule System for Crack Repair
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Solution Overview
Problem
Elastomers used in various applications are prone to cracking due to fatigue and repeated stresses, which can lead to significant impairment of their mechanical properties, and existing self-healing methods often compromise the properties of the healed material.
Innovation Solution
A composite material comprising an elastomer matrix, polymerizer capsules, and corresponding activator capsules that self-heal by forming a polymer when a crack occurs, maintaining the elastomeric behavior and properties of the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a crack is healed by applying another polymer to the crack surface, then the crack is repaired, but the mechanical properties of the healed elastomer are impaired if the new polymer and original material properties are not closely matched
Solution Approach 1:
The elastomer system performs self-healing by utilizing its own components (polymerizer capsules and activator capsules) to repair cracks automatically without external intervention. The polymerizer and activator are already embedded in the elastomer matrix, so when a crack occurs, the system uses its intrinsic components to heal itself, ensuring the healed material maintains properties matching the original elastomer.
Solution Approach 2:
The patent changes the chemical state of the polymerizer and activator from isolated capsule forms to reactive monomer/catalyst forms upon crack formation. This parameter change enables the materials to transition from a stable, non-reactive state to an active healing state, forming polymer chains that restore the elastomer's mechanical properties.
2Adaptability or versatility
If elastomers are subjected to repeated stresses during use, then they perform their function of providing flexibility, but cracks can grow quickly once initiated
Solution Approach 1:
The polymerizer and activator are pre-embedded in the elastomer matrix during manufacturing, positioned to activate immediately when a crack forms. This preliminary preparation ensures that the healing mechanism is ready before the crack can propagate under repeated stress, stopping crack growth before it compromises reliability.
Solution Approach 2:
The patent converts the harmful effect of repeated stress (which causes cracking) into a beneficial trigger for the self-healing mechanism. The stress that would normally cause crack propagation instead activates the polymerizer-activator system, which then forms polymer to restore the elastomer's integrity and continue providing flexibility.
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 self-healing composite material effectively repairs cracks while maintaining the original mechanical properties, enhancing the longevity and performance of elastomers by increasing tear strength and healing efficiency.
Implementation Method 1
The DCPD then mixes with the Grubbs catalyst, undergoes Ring Opening Metathesis Polymerization (ROMP), and cures to provide structural continuity where the crack had been
Data Source
AI summary
A composite material includes an elastomer matrix, a set of first capsules containing a polymerizer, and a set of second capsules containing a corresponding activator for the polymerizer. The polymerizer may be a polymerizer for an elastomer. The composite material may be prepared by combining a first set of capsules containing a polymerizer, a second set of capsules containing a corresponding activator for the polymerizer, and a matrix precursor, and then solidifying the matrix precursor to form an elastomeric matrix.