Sulfur-Containing Sealant Copolymerization for Adhesion
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Solution Overview
Problem
Current sealants in aerospace applications face challenges in achieving improved adhesion while maintaining mechanical, chemical, and environmental performance, particularly on various surfaces including metal, primer, intermediate, and aged coatings.
Innovation Solution
Copolymerizing adhesion promoters directly into a sulfur-containing polymer backbone, specifically using sulfur-containing compounds with structures that incorporate reactive terminal groups for enhanced adhesion, forming a strong polymer network within the sealant structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesion promoters are added to sealant formulations, then adhesion is enhanced, but the structural integrity and mechanical properties of the sealant may be compromised
Solution Approach 1:
The adhesion promoter is merged with the polymer backbone through copolymerization, creating a unified structure where the adhesion promoter becomes an integral part of the polymer chain rather than a separate additive. This ensures that the adhesion promoter is strongly coupled to the polymer network, maintaining structural integrity while enhancing adhesion properties.
Solution Approach 2:
The invention creates a composite polymer structure combining the sulfur-containing polymer backbone with adhesion promoter units. This composite material integrates the desirable properties of both components - the mechanical strength of the sulfur-containing polymer and the adhesion-enhancing properties of the adhesion promoter - into a single cohesive material system.
2Reliability
If adhesion promoters are strongly coupled to the polymer network, then adhesion is improved, but the complexity of polymer synthesis increases
Solution Approach 1:
The adhesion promoter units are pre-synthesized with the appropriate functional groups before being incorporated into the polymer backbone. This preliminary preparation allows for more controlled and efficient copolymerization, reducing the overall complexity of the synthesis process while ensuring strong coupling of the adhesion promoter to the polymer network.
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
This approach significantly enhances the adhesion properties of sealants, ensuring strong coupling of adhesion promoters to the polymer network, thereby improving the sealant's mechanical and chemical resistance on diverse surfaces.
Implementation Method 1
Copolymerizing adhesion promoters directly to a sulfur-containing polymer backbone ensures that the adhesion promoters are strongly coupled to the polymer network
Implementation Method 2
adhesion promoters are strongly coupled to the polymer network, which forms the structure of a cured sealant
Data Source
AI summary
Disclosed are sulfur-containing polymers containing copolymerizable adhesion promoters and compositions including sealant compositions useful in aerospace applications comprising sulfur-containing polymers containing copolymerizable adhesion promoters. In particular, polythioethers and polysulfides incorporating copolymerizable adhesion promoters are disclosed.