Polysulfide Self-Healing Compound Synthesis
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Solution Overview
Problem
Current self-healing materials face challenges in productivity and self-healing power, with complex synthesis processes and limited repair capabilities, particularly in applications requiring high durability and re-processability.
Innovation Solution
A compound with a specific polysulfide skeleton, represented by the general formula (1), is used in a composition that includes acrylic or methacrylic groups, hydrocarbon groups, and optional unsaturated hydrocarbon or thiol groups, enabling easy synthesis and effective self-healing through bond cleavage and recombination upon heating or light irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-healing materials use complex molecular structures with dynamic covalent bonds, then self-healing capability is improved, but productivity and synthesis simplicity deteriorate
Solution Approach 1:
The patent changes the chemical structure parameters by introducing a polysulfide skeleton with specific S-S bond characteristics. This allows the material to achieve self-healing capability through reversible bond dissociation and recombination while maintaining simpler synthesis processes and higher productivity compared to complex dynamic covalent bond systems.
Solution Approach 2:
The patent creates a composite material system combining the polysulfide skeleton compound with acrylic or methacrylic monomers. This composite approach enables the material to exhibit both self-healing properties and improved productivity, as the polysulfide component provides the self-healing mechanism while the acrylic/methacrylic components facilitate easier synthesis and processing.
2Reliability
If self-healing materials use reversible bond dissociation and recombination, then self-healing capability is improved, but molecular structure complexity increases
Solution Approach 1:
The patent modifies the molecular structure parameters by using a polysulfide skeleton with S-S bonds that can reversibly dissociate and recombine. This approach achieves self-healing capability while keeping the molecular structure relatively simple compared to other dynamic covalent bond systems, thus reducing synthesis complexity.
3Reliability
If self-healing materials use microcapsules with polymerizable monomers, then self-healing capability is improved, but the number of self-healing cycles is limited
Solution Approach 1:
The patent implements a self-service mechanism where the polysulfide skeleton compounds can repeatedly undergo bond dissociation and recombination without depleting a finite reservoir of healing agents. This allows the material to perform multiple self-healing cycles, overcoming the limitation of microcapsule-based systems where the healing agent is consumed after one use.
4Strength
If polymer materials use strong covalent bonds, then mechanical strength and durability are improved, but re-processability and reusability deteriorate
Solution Approach 1:
The patent introduces dynamic characteristics to the covalent bonds by using polysulfide S-S bonds that can reversibly dissociate and recombine. This dynamic bond behavior allows the material to maintain strong mechanical strength during normal use while enabling re-processing and reusability when needed, such as through self-healing or reshaping operations.
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 compound achieves excellent self-healing power, allowing for repeated repairs and maintaining dynamic strength, even after heavy damage, with a simple synthesis method and improved productivity compared to existing materials.
Implementation Method 1
there has been known a self-healing material using reversible bond dissociation and recombination, which is obtained by applying an external stimulus to a material using a dynamic covalent bond
Implementation Method 2
applying an external stimulus to a material using a dynamic covalent bond
Implementation Method 3
applying an external stimulus to a material using a dynamic covalent bond
Data Source
Figure 1
AI summary
Provided is a compound, which is represented by the following general formula (1): where X1 and X2 each independently represent an acrylic group or a methacrylic group, R1 to R8 each independently represent a hydrogen atom or a hydrocarbon group having 1 to 6 carbon atoms, and "n" represents an integer of from 1 to 10.