Photosensitive Adhesive Reversible Cyclization
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Solution Overview
Problem
Conventional photo-release tapes used in panel manufacturing are irreversible after exposure to light, making them disposable and increasing manufacturing costs and complexity due to their irreversible adhesion reduction.
Innovation Solution
A photosensitive adhesive polymerized by cinnamate and a monomer, which undergoes reversible cyclization under specific light wavelengths, allowing control over adhesion force through light energy, enabling repeated use and reduced material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photo-release tape is used with irreversible polymerization or air release mechanism, then the adhesion force can be decreased after light exposure, but the tape becomes disposable and cannot be reused, increasing manufacturing cost and complexity
Solution Approach 1:
The patent applies the dynamics principle by designing an adhesive system where the molecular structure can dynamically change between cyclized and non-cyclized states through reversible photo-isomerization. The cinnamate groups can cycle under UV light (200-280 nm) to reduce adhesion for peeling, and decycle under visible light (400-780 nm) to restore adhesion for re-bonding, enabling the adhesive to adapt its properties based on operational needs rather than being fixed or disposable
Solution Approach 2:
The patent implements parameter changes by utilizing light wavelength as a control parameter to switch the adhesive between different functional states. By changing the incident light wavelength (UV vs. visible range), the physical and chemical parameters of the adhesive molecule change reversibly, allowing precise control over adhesion strength without requiring multiple materials or complex manufacturing processes
2Ease of operation
If conventional photo-release tape is used with irreversible reaction, then the adhesion force can be reduced for peeling, but the tape cannot be reused and must be discarded, increasing material cost
Solution Approach 1:
The patent applies the discarding and recovering principle by enabling the adhesive to be temporarily 'discarded' through cyclization under UV light for easy peeling, then recovered through decyclization under visible light for reuse. This reversible process eliminates the need to discard the adhesive tape after single use, allowing the same tape to be repeatedly bonded and peeled without degradation, thereby reducing material waste and cost
3Productivity
If conventional photo-release tape is used with irreversible polymerization, then the adhesive can be activated once, but the adhesion force cannot be restored, requiring disposable usage
Solution Approach 1:
The patent implements continuity of useful action by designing a reversible photo-isomerization system where the adhesive maintains its functional capability across multiple cycles. The cinnamate groups can repeatedly cycle and decycle in response to alternating UV and visible light exposure, allowing the adhesive to continuously provide both bonding and peeling functions without degradation, thereby improving manufacturing efficiency and reducing material consumption compared to single-use disposable tapes
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's reversible cyclization under different light wavelengths allows for adjustable adhesion force, increasing manufacturing efficiency and reducing material costs by enabling repeated use without significant loss in adhesion strength.
Implementation Method 1
Polymerization is performed by an acrylic adhesive reacting with a photo-crosslink agent. After irradiating under certain light waves, the photo-crosslink agent initiates the polymerization and forms a crosslink structure inside the acrylic adhesive to decrease the adhesion force.
Implementation Method 2
Two cinnamate parts in two formula (1) structures are cyclized to form a formula (2) structure under light waves in a range of 280 to 400 nm. The cyclization is reversible.
Implementation Method 3
Air-release type photo-release tape releases air, such as nitrogen gas, after irradiating certain light waves to decrease the adhesion force for peeling from the panels.
Data Source
AI summary
A photosensitive adhesive is polymerized by a cinnamate monomer and a monomer A. By irradiating under different light waves, triggering reversible cyclization causes the adhesion force of the adhesive to change. The adhesion force change is repeatable. Therefore, the efficiency of the manufacture process would increase, and the cost of material would be reduced.