Dynamic Charge Anionic Polymers for Controlled Cationic Release
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Solution Overview
Problem
There is a need for synthetic anionic polymers that are degradable and commercially available, as existing methods for fabricating polyelectrolyte multilayers using hydrolytically degradable anionic polymers are limited due to the scarcity of such polymers, hindering the controlled release of cationic agents.
Innovation Solution
Development of dynamic charge state anionic polymers with removable functional groups, such as amide side chains, that undergo hydrolytic changes in charge state, allowing for the controlled erosion and release of cationic components from multilayers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If degradable anionic polymers are used to fabricate polyelectrolyte multilayers, then controlled release of cationic agents is enabled, but the scarcity of commercially available such polymers limits the approach
Solution Approach 1:
The patent changes the chemical parameter of the anionic polymer by incorporating hydrolytically labile amide bonds into the polyacrylic acid structure. This modification enables the polymer to undergo controlled degradation through hydrolysis, transforming it from a stable polymer into one that can controllably release cationic agents, thereby achieving the desired adaptability without relying on scarce commercial products.
2Stability of the object's composition
If stable polyelectrolyte multilayers are formed, then film stability in physiological environments is achieved, but controlled disassembly and agent release becomes difficult
Solution Approach 1:
The patent introduces dynamic characteristics into the polyelectrolyte multilayer system by incorporating polymers with hydrolytically labile bonds. The film transitions from a static, stable structure to a dynamic system that can autonomously disassemble over time through hydrolysis of the amide bonds, enabling controlled agent release while initially maintaining stability in physiological environments.
Solution Approach 2:
The patent incorporates hydrolytically labile amide bonds into the polymer structure in advance, before the multilayer is formed. This preliminary incorporation of degradable linkages ensures that the film will naturally disassemble through hydrolysis when exposed to physiological conditions, enabling controlled agent release without requiring additional triggers or complex disassembly mechanisms.
3Productivity
If degradable linkages are incorporated into anionic polymers, then film erosion and agent release are promoted, but the lack of commercially available synthetic polymers with these properties hinders implementation
Solution Approach 1:
The patent creates a composite polymer structure by combining polyacrylic acid backbone with amide-containing side chains or copolymer units. This composite approach integrates the desirable properties of stable polyacrylic acid with the degradability of amide bonds, achieving both controlled film erosion and availability through standard polymerization techniques using commercially accessible monomers.
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 polymers enable precise control over film erosion and release of cationic agents, facilitating the development of thin films for biomedical applications by disrupting electrostatic interactions and promoting controlled disassembly in aqueous media.
Implementation Method 1
dynamic changes in charge states (i.e., from anionic to 'less anionic' or to zwitterionic or cationic) to trigger the disruption of multilayers and/or interpolyelectrolyte complexes and the release of agents
Implementation Method 2
Owing to the polyvalent nature of the electrostatic interactions in polyelectrolyte multilayers, these assemblies are frequently regarded to be 'stable' in physiologically relevant environments
Data Source
AI summary
Materials and Methods for the generation of polyelectrolyte multilayers that can erode to release cationic components. The multilayers comprise layers that contain one or more cations and one or more charge-dynamic anionic polymers. Charge-dynamic anionic polymers contain side chains having removable functional groups. Removal of the functional groups results in a change in the net change in the charge of the polymer which can disrupt interactions between cations and the anionic polymers and facilitate release of cations.