Rechargeable Acyclic N-Halamine Polymers for Durable Biocidal Materials
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Solution Overview
Problem
Current biocidal materials face challenges in effectively inactivating bacteria, spores, fungi, yeasts, and viruses within materials, particularly in biofilms, due to resistance and limited penetration, and existing solutions are not cost-effective or flexible enough for wide-scale applications.
Innovation Solution
Development of acyclic N-halamine based biocidal polymers, which are rechargeable and durable, formed by polymerizing methacrylamide (MAA) with other monomers, grafted onto materials like cotton cellulose, and activated with halogen sources to provide broad-spectrum antimicrobial activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antimicrobial additives are directly added into materials during processing, then biocidal function is introduced, but the additives are readily inactivated or fail to penetrate into the materials
Solution Approach 1:
The patent incorporates biocidal agents into the polymer matrix during the manufacturing process, specifically during extrusion and molding operations. This preliminary incorporation ensures the biocidal agent is distributed throughout the material before it solidifies, preventing leaching and inactivation that would occur with post-treatment methods. The biocidal function is thus built into the material structure from the beginning.
Solution Approach 2:
The patent utilizes the melting and solidification parameters of the polymer material during processing to incorporate the biocidal agent. By adding the biocidal agent to the molten polymer during extrusion, the material's physical state change from liquid to solid traps and retains the biocidal agent within the matrix, ensuring deep penetration and long-term durability without leaching.
2Reliability
If conventional antimicrobial treatments are applied to materials, then surface biocidal activity is achieved, but bacteria develop resistance and express more virulent phenotypes
Solution Approach 1:
The patent employs a combination of biocidal agents with different mechanisms of action (organic biocide and inorganic biocide) to create a multi-mode antimicrobial system. This approach prevents bacterial resistance because the bacteria cannot develop immunity to multiple different biocidal mechanisms simultaneously. The inorganic biocide component also provides long-term stability and prevents the development of virulent phenotypes.
Solution Approach 2:
The patent creates a composite biocidal system by combining organic and inorganic biocidal agents within the polymer matrix. This composite approach provides synergistic antimicrobial activity and prevents resistance development, as the bacteria are exposed to multiple different biocidal mechanisms that target different cellular processes.
3Reliability
If materials are treated to achieve deep biocidal penetration, then internal bacteria are inactivated, but the treatment process becomes complex and costly
Solution Approach 1:
The patent achieves deep biocidal penetration by incorporating the biocidal agents during the initial extrusion and molding processes. This preliminary action during manufacturing eliminates the need for complex post-treatment steps such as autoclaving, chemical vapor penetration, or multiple coating applications. The biocidal agent is distributed throughout the material matrix in a single step during production.
Solution Approach 2:
The patent merges the biocidal treatment step with the existing manufacturing process (extrusion and molding). By combining these functions, the patent eliminates separate, complex treatment steps and achieves deep biocidal penetration as an integral part of the standard manufacturing workflow, reducing overall process complexity and cost.
4Reliability
If biocidal agents are incorporated into materials, then microbial inactivation is achieved, but the biocidal activity is lost over time due to leaching and degradation
Solution Approach 1:
The patent utilizes the phase change of the polymer from molten to solid state during processing to trap and retain the biocidal agents within the matrix. This physical entrapment prevents leaching. Additionally, the patent selects biocidal agents with appropriate chemical stability to maintain activity over time while the polymer matrix provides long-term protection against degradation through its protective enclosure.
Solution Approach 2:
The patent employs a rechargeable biocidal system where the inorganic biocide component can be replenished or regenerated after depletion. This recovering mechanism extends the functional life of the biocidal material, allowing the biocidal activity to be restored without replacing the entire material, thus maintaining longevity.
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 acyclic N-halamine polymers demonstrate potent, durable, and rechargeable biocidal effects against a wide range of microorganisms, including bacteria, spores, fungi, and viruses, maintaining effectiveness even after storage and reuse cycles.
Implementation Method 1
polymerizing one or more acyclic N-halamine monomers into a polymer
Implementation Method 2
when microbes come into contact with the N—X structures (X is Cl or Br), a halogen exchange reaction occurs, resulting in the expiration of the microorganisms
Data Source
AI summary
The present invention includes methods and compositions for providing rechargeable aliphatic N-halamine polymers, monomers, copolymers additives and coatings. The rechargeable aliphatic N-halamine includes an aliphatic N-halamine compound exchangeable associated with one or more halides.