Photo-Reactive Adhesive Agent with Liquid Crystalline Azobenzene
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Solution Overview
Problem
Conventional photo-reactive adhesive agents have low adhesive force and difficulty in reversible adhesion and peeling without thermal or mechanical impact, and existing liquid crystalline azobenzene compounds with sugar alcohol skeletons exhibit inadequate adhesion strength.
Innovation Solution
A photo-reactive adhesive agent comprising a liquid crystalline polymer compound with azobenzene or sugar alcohol derivatives, featuring photo-reactive side chains and a weight average molecular weight of 1,000 to 100,000, which can be polymerized to enhance adhesion and peeling capabilities through controlled fluidization and solidification with specific light wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a liquid crystalline azobenzene compound with a sugar alcohol skeleton is used as a photo-reactive adhesive agent, then the adhesive can be repeatedly adhered and peeled reversibly with light application, but the adhesive force is low (50 N/cm² for glass adhesion)
Solution Approach 1:
The patent combines multiple functional components into a composite adhesive system: a photo-reactive compound (azobenzene or sugar alcohol derivative) is integrated with a polymer matrix and reactive monomers. This composite structure allows the adhesive to maintain reversibility through light-induced phase changes while the polymer and monomer components provide enhanced adhesive strength through multipoint adsorption and hydrogen bonding networks.
Solution Approach 2:
The patent utilizes light-induced parameter changes in the photo-reactive compound to control adhesion. Upon irradiation with specific wavelengths, the compound undergoes trans-cis isomerization and phase transitions (crystalline ↔ liquid crystalline ↔ isotropic liquid), which reversibly alter the adhesive's physical state and bonding characteristics, enabling controlled adhesion and peeling cycles.
2Strength
If conventional adhesive agents are used, then strong adhesion can be achieved, but it is difficult to peel them without thermal or mechanical impact and they cannot be re-adhered or recycled
Solution Approach 1:
The patent replaces mechanical or thermal peeling methods with optical control. Instead of requiring mechanical force or heat to break adhesive bonds, the system uses light irradiation to induce phase transitions in the photo-reactive compound, enabling gentle and precise control of adhesion release. This substitution allows reversible peeling without damage to substrates and enables multiple re-adhesion cycles.
3Strength
If the molecular weight of the liquid crystalline compound is increased to enhance adhesive strength through multipoint adsorption, then adhesion strength improves, but the fluidization capability with light irradiation may be reduced
Solution Approach 1:
The patent creates a dynamic adhesive system where the photo-reactive compound can reversibly transition between different physical states. The liquid crystalline phase provides a balance between molecular weight (for strength) and fluidity (for responsiveness). Upon light irradiation, the system dynamically shifts to a more fluid state enabling peeling, then returns to a structured state for re-adhesion, creating a responsive and adaptable adhesive behavior.
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 agent achieves significantly stronger adhesion and reversible peeling with light irradiation, exceeding conventional adhesive strengths by utilizing multipoint adsorption and hydrogen bonding, allowing for repeated use and improved adhesion properties.
Implementation Method 1
a liquid crystalline compound having 2 or more photo-reactive side chains... the liquid crystalline compound being a liquid crystalline polymer compound... obtained by polymerizing a monomer... which can repeatedly adhere and peeled reversibly with the application of light
Implementation Method 2
utilizing multipoint adsorption and hydrogen bonding, allowing for repeated use and improved adhesion properties
Implementation Method 3
utilizing multipoint adsorption and hydrogen bonding, allowing for repeated use and improved adhesion properties
Data Source
AI summary
This invention provides an adhesive agent with a stronger adhesive force that can adhere and be peeled reversibly with the irradiation of light. With the use of a liquid crystalline polymer compound containing azobenzene or a sugar alcohol derivative containing a hydroxyl group and azobenzene, a photo-reactive adhesive agent that can strongly adhere to and be peeled from a substrate reversibly with the irradiation of light can be obtained.