Cucurbituril Hydrogels Supramolecular Cross-Linking
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Solution Overview
Problem
Current hydrogels for biomedical applications face challenges such as brittleness, poor mechanical properties, and inefficient drug delivery due to low water content and high polymer concentrations, which lead to burst release and limited resilience.
Innovation Solution
Development of hydrogels based on cucurbituril cross-linked supramolecular networks with high molecular weight polymers, allowing for high water content and tunable rheological properties, enabling efficient delivery and release of components like proteins with improved mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If covalently cross-linked polymer hydrogels are used, then mechanical strength is improved, but brittleness increases and transparency deteriorates
Solution Approach 1:
The patent changes the chemical nature of cross-links from covalent to non-covalent supramolecular interactions (host-guest complexation between cyclodextrin and adamantane derivatives). This parameter change allows the hydrogel to achieve mechanical strength through reversible supramolecular bonding while avoiding the brittleness associated with permanent covalent cross-links, enabling self-healing capability
Solution Approach 2:
The patent creates a composite hydrogel system combining polymer chains with supramolecular cross-links formed by cyclodextrin-adamantane host-guest complexes. This composite structure integrates the flexibility of polymer networks with the reversible bonding of supramolecular interactions, achieving both mechanical strength and self-healing properties
2Strength
If high polymer concentration is used in hydrogels, then mechanical properties are improved, but water content decreases leading to poor transparency and increased brittleness
Solution Approach 1:
The patent changes the cross-linking mechanism to supramolecular host-guest interactions, which are weaker and more reversible than covalent bonds. This allows the use of lower polymer concentrations while maintaining adequate mechanical properties through the cumulative effect of numerous reversible supramolecular cross-links, thereby preserving high water content and transparency
3Ease of manufacture
If conventional hydrogels are used for drug delivery, then simplicity is maintained, but drug delivery efficiency deteriorates due to burst release
Solution Approach 1:
The patent introduces dynamic reversibility through supramolecular cross-links that can break and reform. This dynamic characteristic enables controlled drug release by adjusting environmental conditions (pH, temperature, competitive guests) to modulate cross-link stability, transforming conventional static hydrogels into responsive delivery systems that prevent burst release while maintaining ease of manufacture
Solution Approach 2:
The patent changes the release kinetics by using supramolecular interactions with tunable binding constants. By selecting different cyclodextrin and adamantane derivatives with varying affinity, the system achieves controlled sustained release profiles while maintaining the simplicity of hydrogel-based delivery
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 cucurbituril-based hydrogels exhibit enhanced mechanical properties, continuous shear-thinning behavior, and efficient component delivery with high water content, addressing the limitations of existing hydrogels by providing stable and controlled release systems.
Implementation Method 1
hydrogels based on a cucurbituril cross-linked supramolecular network
Implementation Method 2
employing dynamic and reversible non-covalent interactions as the structural cross-links in hydrogels
Implementation Method 3
three-dimensional cross-linked polymer networks that entrap and store large amounts of water
Data Source
AI summary
The invention provides hydrogel, wherein the hydrogel has a supramolecular cross-linked network obtainable or obtained from the complexation of an aqueous composition including a host, such as cucurbituril, and one or more polymers having suitable guest functionality. One or more polymers in the aqueous composition may have a molecular weight of 50 kDa or more, such as 200 kDa or more. The hydrogel may hold a component, such as a therapeutic compound or a biological molecule. The hydrogels are suitable for use in medicine.