Self-Healing Laminate with Dynamic Urea Bonds
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Solution Overview
Problem
Current self-healing materials face limitations such as non-autonomous healing, poor mechanical properties, and instability issues, particularly in intrinsic approaches, while extrinsic methods suffer from limited real-world applications due to chemical instability, leakage, and optical clarity problems.
Innovation Solution
A self-healing laminate composition comprising a first self-healing layer with dynamic urea or urethane bonds and a second mechanical layer, where the self-healing polymer includes reversible linking groups that can autonomously repair damage at ambient temperatures, providing excellent mechanical properties and repeated healing cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intrinsic self-healing materials are used to enable autonomous repair, then self-healing capability is improved, but mechanical properties deteriorate (modulus less than 1 MPa)
Solution Approach 1:
The patent combines a self-healing polymer layer with a structural polymer layer to create a laminate composition. The self-healing layer provides autonomous repair capability through dynamic reversible bonds, while the structural layer contributes mechanical strength and rigidity. This merging allows the composite material to achieve both self-healing functionality and adequate mechanical properties that neither layer could provide alone.
Solution Approach 2:
The invention uses a composite laminate structure consisting of at least two layers: a self-healing polymer layer and a structural polymer layer. This composite approach allows the material to integrate the unique properties of each component - the self-healing capability from the first layer and the mechanical strength from the second layer - to overcome the limitations of using a single material system.
2Strength
If mechanical properties of self-healing films are increased, then strength is improved, but self-healing feature deteriorates (requiring thermal treatment)
Solution Approach 1:
By merging a self-healing polymer layer designed for ambient temperature healing with a structural polymer layer providing mechanical strength, the laminate achieves both properties simultaneously. The self-healing layer maintains its soft, flexible nature enabling ambient healing, while the structural layer provides the necessary strength without requiring the entire system to be strengthened (which would compromise healing).
Solution Approach 2:
The patent applies different properties to different layers: the self-healing layer is designed with soft, flexible characteristics and dynamic bonds for ambient temperature healing, while the structural layer is designed with higher strength and rigidity. Each layer performs its specialized function locally, allowing the composite to achieve both ambient self-healing and adequate mechanical properties.
3Reliability
If extrinsic self-healing approach is used to achieve autonomous healing, then self-healing capability is improved, but chemical stability deteriorates (healing agent instability and leakage)
Solution Approach 1:
The self-healing polymer layer contains dynamic reversible bonds (such as hydrogen bonds, host-guest interactions, or disulfide bonds) that autonomously repair damage without requiring external healing agents. The material serves itself by using its own molecular structure to heal cracks and damage through bond breaking and reforming, eliminating the need for separate healing agents that could leak or become unstable.
Solution Approach 2:
The invention extracts and eliminates the problematic healing agent component from extrinsic self-healing systems. By using intrinsic self-healing mechanisms where the polymer itself contains the healing capability through dynamic bonds, the patent removes the need for separate encapsulated healing agents that cause chemical stability issues, while still achieving autonomous self-healing functionality.
4Reliability
If frequent repairs are performed to avoid damage progression, then reliability is improved, but maintenance cost increases and environmental hazards arise
Solution Approach 1:
The self-healing laminate composition autonomously repairs its own damage through the self-healing polymer layer's dynamic reversible bonds. This self-service capability eliminates or reduces the need for frequent manual repairs, thereby reducing maintenance costs and the environmental impact associated with repair materials and disposal of damaged components.
Solution Approach 2:
The self-healing layer continuously monitors and repairs minor damage as it occurs, preventing cracks from propagating and causing more severe damage. This preliminary action of autonomous repair prevents the need for later, more extensive repairs, reducing overall maintenance requirements and environmental impact.
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 solution enables autonomous self-healing at ambient temperatures with improved mechanical properties, reducing maintenance costs and environmental hazards, and offering a wide range of applications by addressing the limitations of existing self-healing materials.
Implementation Method 1
a self-healing polymer that is damaged can undergo autonomous repair when separated surfaces re-contact each other due to the soft nature of the self-healing polymer, whereupon reversible bonds can reform to rejoin and repair the damaged self-healing polymer
Data Source
AI summary
The disclosure relates to a self-healing laminate composition. The composition includes a first, self-healing layer with a self-healing polymer and a second, mechanical layer adjacent to the first layer. The second layer includes any desired polymer, for example a crosslinked polymer, a thermoplastic polymer, or a functional thermoset polymer. Self-healing polymers with dynamic covalent bonds are suitable, for example those with dynamic urea bonds and/or dynamic urethane bonds. A self-healing polymer that is damaged can undergo autonomous repair when separated surfaces re-contact each other due to the soft nature of the self-healing polymer, whereupon reversible bonds can reform to rejoin and repair the damaged self-healing polymer. When the self-healing laminate according to the disclosure is damaged, the self-healing mechanism of the first layer can cause the repair of both layers. The self-healing laminate composition can be used as a coating on any of a variety of substrates to provide self-healing properties to a surface of the substrate.