Sulfonated Block Copolymer Laminates for Humidity-Resistant Bonding
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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, as existing sulfonated block copolymers face challenges in maintaining adhesion under humidity and temperature conditions.
Innovation Solution
A process involving sulfonated block copolymers with specific configurations, where the film is exposed to water to become partially or fully hydrated and then laminated onto the substrate by drying, forming a permanent bond due to interaction between wet sulfonic acid functional groups and the substrate surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If sulfonated block copolymer films are used to bond to polar or metal substrates, then adhesion strength is improved, but delamination occurs under high humidity and temperature conditions
Solution Approach 1:
The patent applies parameter changes by controlling the degree of sulfonation (10-100 mol percent) and the block copolymer composition to optimize the balance between adhesion strength and moisture resistance. The sulfonic acid content is precisely adjusted to achieve strong bonding while maintaining stability in humid environments.
Solution Approach 2:
The patent uses composite materials by creating a laminated structure consisting of the sulfonated block copolymer film bonded to the substrate. This composite approach combines the adhesive properties of the sulfonated polymer with the structural properties of the substrate, achieving both strong bonding and humidity resistance.
2Strength
If the film is exposed to water for hydration, then bonding capability is improved, but film structural integrity may deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-hydrating the sulfonated block copolymer film before lamination to the substrate. This preliminary hydration activates the sulfonic acid groups for optimal bonding while the subsequent lamination process locks in the structural integrity, preventing water-induced deterioration.
Solution Approach 2:
The patent provides beforehand cushioning by using the crosslinked network structure of the sulfonated block copolymer to resist water-induced swelling and structural degradation. The crosslinked architecture cushions against the destabilizing effects of water exposure while maintaining bonding capability.
3Strength
If sulfonic acid functional groups are increased for stronger bonding, then adhesion to substrate is improved, but susceptibility to water-induced delamination increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the sulfonation degree (10-100 mol percent) to achieve the optimal balance between adhesion strength and water resistance. This parameter optimization ensures sufficient sulfonic acid groups for strong bonding while preventing excessive hydrophilicity that would cause delamination.
Solution Approach 2:
The patent applies local quality by concentrating sulfonic acid functional groups at the substrate-film interface where bonding is needed, while the bulk film composition is controlled to maintain moisture resistance. This localized functional distribution achieves strong adhesion without compromising overall film stability.
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 resulting laminate maintains strong bonding to the substrate even after exposure to high humidity and elevated temperatures, preventing delamination for extended periods, making it suitable for applications in energy exchange systems and water treatment.
Implementation Method 1
forming a permanent bond due to interaction between wet sulfonic acid functional groups and the substrate surface
Implementation Method 2
exposing the film to water to obtain a partially or fully hydrated film
Data Source
AI summary
Disclosed herein is 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, or in a humidity of up to 85%, and at a temperature of at least 60° C. The laminates are used for a variety of applications including energy exchange applications.