Thermolabile Polymerizable Compositions for Low-Temperature Debonding
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Solution Overview
Problem
Current adhesive systems require high temperatures (above 100°C) for rapid debonding, which limits their application in technologies needing reversible and low-temperature debonding, such as in orthodontics and recycling processes.
Innovation Solution
Development of polymerizable compositions based on thermolabile polymerizable compounds of Formula I, which form network polymers that are storage-stable at room temperature and can be thermally softened reversibly at low temperatures (less than 100°C), enabling self-healing or debonding-on-demand properties in materials like adhesives, cements, and composites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional adhesive systems are used, then strong adhesive bonds are formed, but high temperatures (above 100°C) are required for rapid debonding
Solution Approach 1:
The patent modifies the chemical structure of the adhesive by incorporating thermolabile groups (T) that undergo retro-Diels-Alder reactions at specific temperatures. By changing the parameters of the polymerizable compound (Formula I) to include these thermolabile moieties, the debonding temperature is reduced from above 100°C to below 100°C, enabling low-temperature reversible bonding applications.
Solution Approach 2:
The adhesive system combines multiple functional components: polymerizable groups (Z) for crosslinking, thermolabile groups (T) for temperature-responsive debonding, and various substituents (A, Q, Sp, U, V, W, X, Y) that provide additional properties. This composite molecular structure integrates strong bonding capability with low-temperature reversible debonding, expanding application versatility.
2Adaptability or versatility
If thermally cleavable compounds are used to enable low-temperature debonding, then adaptability is improved, but the complexity of the polymerizable compound increases
Solution Approach 1:
The polymerizable compound is segmented into distinct functional domains: polymerizable groups (Z) for crosslinking, thermolabile groups (T) for reversible bonding, and substituent regions (A, Q, Sp, U, V, W, X, Y) for property tuning. This segmentation allows each functional element to perform its specific role independently, managing molecular complexity through functional modularity.
Solution Approach 2:
The compound of Formula I is designed as a multi-functional molecule where a single molecular structure provides: (a) polymerization capability via groups Z, (b) thermal reversibility via groups T, (c) crosslinking via m-valent and n-valent groups, and (d) adjustable properties via substituents. This multi-functionality reduces the need for separate additives while achieving reversible bonding capability.
3Strength
If high crosslinking density is used to strengthen the adhesive bond, then strength is improved, but the ability to soften at low temperatures decreases
Solution Approach 1:
The patent adjusts the parameters of the thermolabile groups (T) and their positioning within the molecular structure to decouple crosslinking density from softening temperature. By optimizing the retro-Diels-Alder reaction characteristics of groups T, the adhesive maintains strong bonding through crosslinking while softening at low temperatures (below 100°C) when the thermolabile groups cleave, resolving the trade-off between strength and softening temperature.
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 compositions allow for efficient and controlled debonding at moderate temperatures, making them suitable for various applications, including dental materials and chemically reversible mounting and fixing elements, with a half-value temperature of less than 120°C, enhancing their versatility and functionality.
Implementation Method 1
The compositions are based on a thermolabile polymerizable compound of Formula I... which form network polymers that are storage-stable at room temperature and can be thermally softened reversibly at low temperatures
Data Source
AI summary
The invention relates to a polymerizable composition which comprises a thermolabile polymerizable compound of Formula I:A-[X-(T-X-Sp-X)p-T-X-Q-(Z)n]m Formula I,wherein T represents a thermolabile Diels-Alder or hetero-Diels-Alder group of the FormulaThe invention also relates to the use of the polymerizable composition according to the present invention and the compounds of Formula I according to the present invention as polymerization resin or for the preparation of polymerization resins and polymerizates such as adhesives, composites, stereolithographic materials, shaped parts, duromers and mounting and fixing elements, and as dental material and for the preparation of dental materials such as adhesives, cements and filling composites.