Ionic Liquid Adhesive Debonding via Electromotive Force
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Solution Overview
Problem
Existing ionic compositions used as adhesives and coatings can be corrosive to aluminum surfaces, necessitating a non-corrosive and debondable solution for metallic substrates.
Innovation Solution
Development of cationic ammonium and anionic fluorosulfonylimide compositions that form a debondable adhesive layer, which can be removed from surfaces using an electromotive force without damaging the substrate, featuring a cation with amino and ammonium groups and a bis(sulfonyl)imide anion, reducing corrosive effects on metallic substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ionic compositions including imidazolium sulfonylimides are used as adhesives, then adhesive bonding capability is improved, but corrosiveness to aluminum surfaces increases
Solution Approach 1:
The patent changes the chemical parameters of the ionic composition by replacing imidazolium cations with amino-ammonium cations and adjusting the anion composition. This parameter change maintains adhesive bonding capability while reducing corrosiveness to aluminum surfaces, as the new cation structure does not exhibit the same corrosive behavior as imidazolium compounds.
Solution Approach 2:
The patent creates a composite ionic composition by combining amino-ammonium cations with specific anions (fluorosulfonylimide and/or bis(fluorosulfonyl)imide). This composite approach allows the material to exhibit both strong adhesive properties and reduced corrosiveness, as the combination of specific cation-anion pairs produces synergistic effects that address both requirements simultaneously.
2Strength
If ionic compositions are used as adhesives for metallic substrates, then bonding strength is improved, but surface integrity deteriorates due to corrosion
Solution Approach 1:
The patent modifies the chemical composition parameters by selecting amino-ammonium cations with specific structural characteristics that prevent corrosive interactions with metallic substrates. This parameter change enables the adhesive to maintain strong bonding while preserving surface integrity, as the modified cation structure does not promote corrosion reactions.
Solution Approach 2:
The patent converts the potential harm of ionic composition corrosiveness into a benefit by carefully selecting cation and anion pairs that eliminate corrosive effects while maintaining or enhancing adhesive properties. The specific combination of amino-ammonium cations with fluorosulfonylimide anions creates a composition that is inherently non-corrosive to metals, thus converting the original harmful property into a beneficial non-corrosive characteristic.
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 composition effectively bonds and debonds from metallic surfaces without causing corrosion, maintaining the surface integrity and allowing for selective debonding under an electromotive force, thus addressing the corrosiveness issue of prior compositions.
Implementation Method 1
ionic compositions can be useful as adhesives, such as adhesives for metal surfaces
Implementation Method 2
compositions including some imidazolium sulfonylimides can be relatively corrosive to an aluminum surface... can be debonded from the surface without harm to that surface upon the application of an electromotive force
Data Source
AI summary
An electrically debondable adhesive composition is described. The adhesive is comprised of a basic ionic liquid and an optionally crosslinked polymer, wherein the basic ionic liquid is comprised of an amino-ammonium cation and a bis(fluorosulfonyl)imide anion.