Sulfonated Block Copolymer Laminates for Wet Adhesion on Metal Substrates
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Solution Overview
Problem
There is a need for polymeric films that can be strongly bonded to polar or metal substrates without delamination, especially in wet environments, for applications such as energy exchange systems and water treatment, where existing technologies face challenges in maintaining adhesion over time.
Innovation Solution
A process involving sulfonated block copolymers with specific configurations and sulfonation levels is used to create films that are laminated onto substrates by hydrating the film with water and allowing it to dry, forming a strong chemical bond with the substrate, preventing delamination even after prolonged exposure to water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymeric films are used for laminating substrates, then initial adhesion may be achieved, but delamination occurs in wet environments over time
Solution Approach 1:
The invention changes the chemical parameters of the polymer by introducing sulfonic acid groups through sulfonation of styrenic block copolymers. This chemical modification enables the polymer to form strong bonds with polar and metal substrates that maintain adhesion durability even in wet environments over extended periods
Solution Approach 2:
The invention creates a composite system by combining sulfonated styrenic block copolymers with polar or metal substrates. The sulfonated polymer acts as an adhesive layer that chemically bonds to the substrate, forming a composite laminate structure with superior wet adhesion properties compared to conventional polymers
2Reliability
If sulfonic acid functional groups are introduced to improve substrate bonding, then adhesion to polar and metal substrates is enhanced, but film casting difficulty increases
Solution Approach 1:
The invention applies local quality by concentrating sulfonic acid functional groups specifically at the film-substrate interface through selective sulfonation of the block copolymer. This localized functionalization enhances substrate bonding while the rest of the polymer matrix maintains its film-forming properties, resolving the contradiction between bonding efficiency and manufacturability
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 laminated films remain bonded to the substrate for extended periods, including in highly humid environments, and are suitable for applications like air to air energy exchange systems and water treatment, offering improved durability and performance.
Implementation Method 1
exposing the film to water and laminating the film by drying the film onto the polar surface or active metal surface of a substrate
Implementation Method 2
a film comprising a sulfonated block copolymer having at least two polymer end blocks that contain little or no sulfonic acid or sulfonate functionality and at least one polymer interior block which contains an effective amount of sulfonic acid or sulfonate functionality
Data Source
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AI summary
A process for laminating a polar substrate with a film cast from a sulfonated block copolymer having at least one end block A and at least one interior block B wherein each A block contains essentially no sulfonic acid or sulfonate ester functional groups and each B block is a polymer block containing from about 10 to about 100 mol percent sulfonic acid or sulfonate ester functional groups based on the number of monomer units. The film is exposed to water and dried onto a polar or active metal substrate. The laminates do not delaminate in the presence of water and may be used for a variety of applications including energy exchange applications.