Strain-Promoted Hydrogel Crosslinking via Cycloaddition
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Solution Overview
Problem
Existing hydrogel technologies face challenges in biocompatibility due to the use of metal catalysts, organic solvents, and incomplete conversion of functional groups, limiting their clinical translation and mechanical control over crosslinking, especially in the presence of gelatins, collagens, lipids, carbohydrates, or polymer nanofibers.
Innovation Solution
The development of covalently crosslinked hydrogels through a strain-promoted azide-alkyne cycloaddition reaction between 8-member cycloalkyne functionalized polyalkylene glycols and multi-arm glycerol ethoxylate triazides, which do not require catalysts or initiators, allowing for mechanical control of crosslinking and compatibility with sensitive biological materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal catalysts and chemical initiators are used for crosslinking, then crosslinking efficiency is improved, but biocompatibility deteriorates due to toxic byproducts and residual catalysts
Solution Approach 1:
The patent removes metal catalysts and chemical initiators from the crosslinking system, extracting the harmful elements while retaining the crosslinking function through strain-promoted azide-alkyne cycloaddition that proceeds without catalytic metals
Solution Approach 2:
The patent replaces chemical/thermal initiation mechanisms with mechanical strain as the triggering mechanism for crosslinking, using physical deformation to activate the cycloaddition reaction between azide and alkyne functional groups
2Speed
If UV light and heat are used for gelation, then network formation is accelerated, but biocompatibility deteriorates due to damage to sensitive biological materials
Solution Approach 1:
The patent replaces photopolymerization and thermal initiation with strain-promoted chemical cycloaddition, using mechanical deformation as the activation trigger to form hydrogel networks without UV light or heat that could damage biological materials
3Object-affected harmful factors
If physical crosslinking methods are used, then biocompatibility is maintained, but mechanical properties deteriorate due to weak interactions in swollen state
Solution Approach 1:
The patent changes the crosslinking mechanism from physical interactions to covalent chemical bonds through strain-promoted azide-alkyne cycloaddition, creating permanent crosslinks that maintain mechanical strength while preserving biocompatibility
Solution Approach 2:
The patent creates a composite hydrogel system combining polyethylene glycol chains with azide and alkyne functional groups that form covalent crosslinks upon strain application, achieving both biocompatibility and mechanical integrity
4Ease of manufacture
If conventional crosslinking initiators are used, then network formation is achieved, but versatility deteriorates due to incompatibility with gelatins, collagens, lipids, carbohydrates, or polymer nanofibers
Solution Approach 1:
The patent removes catalytic metals and chemical initiators that interfere with biological materials, using a metal-free strain-promoted cycloaddition mechanism that is compatible with gelatins, collagens, lipids, carbohydrates, and polymer nanofibers
Solution Approach 2:
The patent creates a universal crosslinking system based on strain-promoted azide-alkyne cycloaddition that can form hydrogel networks in the presence of various biological materials without interference, achieving broad compatibility across different tissue components
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
These hydrogels provide biocompatibility, mechanical control over crosslinking, and the ability to encapsulate sensitive cells, with no toxic byproducts, enabling versatile applications including in situ formation and syringe-injectable materials.
Implementation Method 1
covalently crosslinked hydrogels through a strain-promoted azide-alkyne cycloaddition reaction between 8-member cycloalkyne functionalized polyalkylene glycols and multi-arm glycerol ethoxylate triazides
Data Source
AI summary
The present invention is directed to a covalently crosslinked hydrogel comprising the strain-promoted reaction product of an 8-member cycloalkyne functionalized polyalkylene glycol and a multi-arm glycerol exytholate triazide and methods for making them. Because the precursor materials can be manipulated without causing crosslinking, provided the strain threshold is not reached, these hydrogels permit mechanical control over when (and where) cross linking occurs and are easier to use than prior strain-activated or temperature-activated systems. These novel hydrogels do not require a catalyst to cross link, thus avoiding the biocompatibility problems common to many catalysts. Nor is the crosslinking process affected by the presence of catalysts or other substances, which have interfered with crosslinking in known strain induced hydrogels. Because of their crosslinking reaction kinetics, these novel hydrogels can encapsulate and transport highly sensitive cells and other biological additives and have no known toxic byproducts.