Reversible Covalent Bonding for Polyionic Coatings
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Solution Overview
Problem
Traditional Layer-by-Layer (LbL) deposition methods using water as a solvent are limited in the scope of materials that can be used and result in coatings with restricted performance and range of properties due to the requirement for charge-charge, hydrogen bonding, or other complementary interactions, which restricts the types of polyionic molecules that can be employed.
Innovation Solution
A method involving the deposition of a first material with reversible bonding moieties and crosslinkable moieties, followed by a second material with complementary reversible bonding moieties, stabilized by ionic, hydrogen bonding, or covalent forces, allowing for the formation of bilayers and subsequent crosslinking to enhance coating stability and properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional LbL deposition methods use water as solvent with charge-charge or hydrogen bonding interactions, then the process is simple and cost-effective, but the scope of materials that can be used is restricted and coating performance is limited
Solution Approach 1:
The patent changes the bonding mechanism parameter from traditional charge-charge or hydrogen bonding to reversible covalent bonding (such as disulfide bonds, hydrazone bonds, or boronate ester bonds). This parameter change enables the use of a broader scope of materials including those that do not rely on electrostatic interactions, thereby resolving the contradiction between material versatility and process complexity
Solution Approach 2:
The patent introduces reversible bonding moieties as intermediary functional groups that mediate the interaction between polyionic molecules and the substrate or between successive layers. These reversible bonding moieties act as intermediaries that enable broader material compatibility while maintaining a controlled deposition process, addressing the contradiction between material scope and process complexity
2Reliability
If traditional LbL methods rely on ionic or hydrogen bonding for layer assembly, then the deposition process is straightforward, but the mechanical durability and environmental stability of coatings are restricted
Solution Approach 1:
The patent changes the bonding strength parameter from weak ionic or hydrogen bonds to stronger reversible covalent bonds. This parameter change significantly improves coating mechanical durability and environmental stability while the reversibility feature allows for controlled assembly and disassembly, preventing excessive complexity in the deposition process
Solution Approach 2:
The patent introduces dynamic reversibility to the bonding mechanism, allowing bonds to form and break under specific conditions. This dynamic characteristic enables the coating to adapt to environmental changes and mechanical stresses, improving reliability while maintaining process controllability through conditional bonding and debonding events
3Stability of the object's composition
If crosslinking is introduced to enhance coating stability, then coating robustness improves, but the complexity of the deposition process increases
Solution Approach 1:
The patent changes the crosslinking mechanism parameter from permanent covalent crosslinking to reversible covalent crosslinking. This parameter change enhances coating stability and robustness while allowing for controlled manipulation of the crosslinked network through environmental conditions, preventing excessive complexity in the deposition and processing steps
Solution Approach 2:
The patent introduces reversible bonding moieties as intermediaries in the crosslinking process. These intermediary groups enable crosslinking to occur under mild conditions and allow for controlled de-crosslinking if needed, enhancing coating stability without requiring complex multi-step deposition processes or extreme processing conditions
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 enables the creation of coatings with improved mechanical and environmental durability, higher crosslink density, and broader material compatibility, overcoming the limitations of traditional LbL methods by incorporating a wider range of polyionic molecules and enhancing film robustness.
Implementation Method 1
depositing a second material comprising second reversible bonding moieties, wherein the second reversible bonding moieties are complementary to the first reversible bonding moieties and are capable of forming a reversible chemical bond
Implementation Method 2
the coating is stabilized by one or more of: (1) ionic attractive forces between any two adjacent layers
Implementation Method 3
hydrogen bonding attractive forces between any two adjacent layers
Implementation Method 4
covalent bonding between bilayers
Data Source
AI summary
The invention provides materials and methods for forming coatings on substrates. The coatings are durable and resistant to damage from environmental, chemical, thermal, and/or radiative sources. In some embodiments, the coatings comprise bilayers of electrostatically charged materials. The bilayers are created by alternately applying solutions comprising water-soluble, electrostatically charged materials. Durability is imparted to the coatings by the formation of crosslinks that are formed within and between layers after deposition of the coatings.