Ionic Liquid Adhesive Composition for Voltage-Triggered Debonding
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Solution Overview
Problem
Electrically debondable adhesive sheets using ionic liquids face challenges in achieving sufficient initial adhesive force when no voltage is applied and adequate debonding force when voltage is applied, with existing solutions failing to balance these two conditions effectively.
Innovation Solution
A composition comprising a polymer, ionic liquid, and orientation material is developed, where the adhesive layer exhibits excellent adhesive strength without voltage and significantly reduced adhesive force when a voltage of 10 V is applied for 10 seconds, enabling cleavage-debonding without stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ionic liquid content is increased to reduce adhesive force after voltage application, then the debondability is improved, but the initial adhesive force when no voltage is applied decreases
Solution Approach 1:
The patent applies parameter changes by modifying the composition ratios of multiple components (polymer, ionic liquid, orientation material) rather than simply increasing ionic liquid content. Specifically, it maintains ionic liquid at 4-50 parts per 100 parts polymer while adding orientation material at 1-30 parts per 100 parts polymer, and adjusts polymer types and ratios to achieve the desired balance between initial adhesive force and debondability.
Solution Approach 2:
The patent uses composite materials by combining multiple adhesive components (different polymer types including acrylic, polyester, and urethane polymers) with ionic liquid and orientation material. This composite approach allows the adhesive composition to exhibit both strong initial adhesion and good debondability under voltage, resolving the contradiction between these two properties.
2Strength
If the initial adhesive force is increased to ensure firm adhesion when no voltage is applied, then the adhesive strength is improved, but the adhesive force after voltage application cannot be sufficiently decreased
Solution Approach 1:
The orientation material acts as an intermediary component that mediates between the polymer matrix and ionic liquid. It facilitates the reorientation of polymer chains and ionic liquid molecules under voltage, enabling the adhesive force to be sufficiently decreased after voltage application while maintaining strong initial adhesive force through the polymer-ionic liquid-orangeation material interaction.
Solution Approach 2:
The patent employs parameter changes by selecting specific polymer types (acrylic, polyester, urethane) with appropriate molecular weights and glass transition temperatures, and by optimizing the content ratios of all three main components. These parameter adjustments enable the adhesive to exhibit high initial strength while allowing sufficient force reduction under voltage for easy debonding.
3Ease of operation
If a voltage is applied to reduce adhesive force for debonding, then the debondability is improved, but the adherend may be deformed due to the force required for separation
Solution Approach 1:
The patent replaces the mechanical debonding system with an electrical field-based system. Instead of applying mechanical force to separate the adherends, a voltage is applied to the adhesive layer, causing ionic liquid migration and polymer chain reorientation that reduces adhesive force. This electrical substitution eliminates the need for large mechanical separation forces that would deform the adherend.
Solution Approach 2:
The ionic liquid serves as an intermediary that responds to the applied voltage by migrating within the adhesive layer, creating an electrical field effect that reduces adhesion. This intermediary mechanism allows debonding to occur through electrical action rather than mechanical force, preventing adherend deformation while achieving easy separation.
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 adhesive composition achieves excellent initial adhesive force without voltage and sufficient debonding force when voltage is applied, facilitating easy separation without deforming the adherend, thus addressing the limitations of existing electrically debondable adhesive sheets.
Implementation Method 1
when a voltage is applied, the cations of the ionic liquid move and reduction occurs in a cathode side; the anions of the ionic liquid move and oxidation occurs in an anode side
Implementation Method 2
an adhesive layer formed of the adhesive composition adheres to an adherend, and is cleaved and debonded from the adherend by applying a voltage of 10 V for 10 seconds
Data Source
AI summary
The present invention relates to an adhesive composition containing a polymer, an ionic liquid, and an orientation material, and an adhesive sheet including an adhesive layer formed from the adhesive composition. The adhesive composition can form an adhesive layer that has excellent adhesive strength when no voltage is applied and whose adhesive force is sufficiently decreased by applying a voltage.