Poly(oligoethylene glycol methacrylate) Hydrogel Crosslinking
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Solution Overview
Problem
PEG hydrogels lack chemical versatility and functionalization options, limiting their properties for biomedical applications, and existing alternatives like POEGMA-based hydrogels are not injectable or degradable, which hampers their clinical potential.
Innovation Solution
Development of hydrogel compositions comprising nucleophile-functionalized and electrophile-functionalized poly(oligoethylene glycol methacrylate) copolymers that can be crosslinked through covalent bonds, enabling tunable mechanical and chemical properties, injectability, and degradability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PEG hydrogels are synthesized via step-growth polymerization, then the hydrogels exhibit non-cytotoxic and non-immunogenic properties, but the polymer lacks chemical versatility and functionalization is limited to hydroxyl chain ends
Solution Approach 1:
The patent combines PEG chains with functional monomers to create copolymer structures that integrate the biocompatibility of PEG with the chemical versatility of functional groups. The composite polymer architecture allows multiple functionalities within a single material system.
Solution Approach 2:
The patent introduces functional groups at specific locations along the polymer chain (local regions) rather than requiring end-group functionalization. This allows different segments of the polymer to have different properties, enabling localized chemical reactivity while maintaining overall PEG biocompatibility.
2Strength
If only two cross-links are formed by each functionalized PEG precursor, then the synthesis is simplified, but the resulting hydrogels are relatively weak or require high concentrations of PEG precursor
Solution Approach 1:
The patent changes the valency parameter of the cross-linking points by using multifunctional monomers that can form multiple cross-links per precursor molecule. This increases the cross-link density without requiring higher PEG precursor concentrations, thereby strengthening the hydrogel network.
Solution Approach 2:
The patent creates a composite cross-linking system where PEG chains are combined with multifunctional cross-linkers, forming a more robust network structure that achieves higher strength at lower precursor concentrations.
3Adaptability or versatility
If PEG hydrogels are used, then the material provides stealth capability to mask from the host's immune system, but the lack of direct chain functionalization introduces significant difficulties in modifying physical properties, chemical reactivity, or biological properties
Solution Approach 1:
The patent enables functionalization at multiple locations along the polymer chain rather than only at chain ends. This local functionalization capability allows modification of biological properties while maintaining the overall PEG stealth characteristics.
Solution Approach 2:
The patent changes the functional group parameters directly on the polymer backbone through copolymerization, allowing easy adjustment of biological properties by selecting different functional monomers without complex post-synthesis modification steps.
4Speed
If rapid cross-linking reactions are used, then gelation occurs faster, but regions of local heterogeneity form within the polymer matrices that scatter light, alter diffusional properties, and degrade mechanical properties
Solution Approach 1:
The patent uses a two-component cross-linking system where precursors are mixed and then triggered to cross-link. This intermediary mixing step allows homogeneous distribution of cross-linking sites before reaction initiation, preventing local heterogeneity even with rapid cross-linking kinetics.
Solution Approach 2:
The patent performs preliminary mixing of precursor solutions to ensure homogeneous distribution of functional groups before initiating cross-linking. This preliminary homogenization prevents local heterogeneity from forming during the rapid gelation process.
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 resulting hydrogels exhibit desirable protein and cell-repellent properties, are chemically and mechanically tunable, injectable, and degradable, overcoming the limitations of traditional PEG hydrogels and POEGMA-based hydrogels, making them suitable for various biomedical applications.
Implementation Method 1
the precursor polymers are crosslinked through covalent bonds
Data Source
AI summary
The present application relates to hydrogel compositions comprising first and second precursor polymers, wherein the precursor polymers are modified poly(oligoethylene glycol methacrylate) copolymers that are crosslinked through electrophile-nucleophile reactions.