Clickable Antimicrobial Molecules in Polymers via Covalent Bonding
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Solution Overview
Problem
Existing antimicrobial polymers face challenges in maintaining long-lasting antimicrobial properties and mechanical flexibility due to physical blending methods, which lead to reduced bactericidal efficiency and increased risk of drug resistance.
Innovation Solution
The development of clickable antimicrobial molecules, such as those based on 1,2-benzisothiazolin-3-one, trimethylguanidine, and polyhexamethylene guanidine, incorporated into polymers like polyurethanes and polyacrylates through click chemistry, allowing for improved antimicrobial and mechanical properties via clickable quaternary ammonium groups and fluorine-containing molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical blending methods are used to incorporate antimicrobial agents into polymers, then the initial antimicrobial activity is achieved, but the bactericidal efficiency reduces quickly over time and mechanical flexibility deteriorates
Solution Approach 1:
The antimicrobial agents (BIT, TMG, PHMG) are pre-functionalized with clickable groups (azide or alkyne) before polymer incorporation, enabling them to form stable covalent bonds with the polymer backbone through click chemistry. This preliminary functionalization ensures permanent attachment that prevents leaching and maintains long-lasting antimicrobial activity
Solution Approach 2:
The patent changes the chemical bonding parameter from physical mixing (weak interactions) to covalent bonding (strong interactions) through click chemistry. This parameter change transforms the antimicrobial polymer from temporary to permanent effectiveness, resolving the contradiction between initial activity and long-term durability
2Reliability
If physical blending of antimicrobial agents with polymers is used, then antimicrobial properties are introduced, but the risk of drug resistance increases and environmental contamination occurs
Solution Approach 1:
The patent creates composite antimicrobial polymers by combining polymer backbones with functionally modified antimicrobial agents through click chemistry. This composite structure integrates the mechanical properties of the polymer with the antimicrobial activity of the embedded agents, providing sustained effectiveness that reduces drug resistance risk
Solution Approach 2:
The patent extracts the harmful aspect of free leaching antimicrobial agents by covalently binding them to the polymer backbone. This extraction of the leaching property eliminates environmental contamination while preserving the antimicrobial function, resolving the contradiction between antimicrobial efficacy and environmental safety
3Reliability
If polymerization of monomers containing guanidine group or quaternary amine is used, then antimicrobial polymers are formed, but the use of available types and number of cationic monomers is limited and flexibility of polymer properties is lost
Solution Approach 1:
The patent segments the antimicrobial function from the polymer backbone by using separate functionalized antimicrobial agents (BIT-Al, TMG-Al, PHMG-Al with azide or alkyne groups) that can be independently selected and then attached to the polymer. This segmentation allows independent optimization of both antimicrobial activity and polymer mechanical properties
Solution Approach 2:
The click chemistry platform provides a universal method for incorporating various antimicrobial agents into different polymer backbones. The alkyne or azide functional groups serve as universal attachment points that work with diverse polymer structures, restoring flexibility and versatility to polymer property design while maintaining antimicrobial activity
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 approach results in polymers with enhanced antimicrobial activity, sustained effectiveness against both Gram-positive and Gram-negative bacteria, and improved mechanical properties, reducing microbial proliferation for extended periods while minimizing the risk of drug resistance.
Implementation Method 1
click chemistry, allowing for improved antimicrobial and mechanical properties
Implementation Method 2
cationic molecules present antimicrobial properties as they universally interact with negatively charged microbial membranes via electrostatic interactions
Data Source
AI summary
In one aspect, the present disclosure relates to click-functional antimicrobial molecules (including small molecules or, in some cases, macromolecules) and the construction of antimicrobial polymers such as polyurethanes, polyesters, and polyacrylates, including through the use of such molecules. In some cases, the antimicrobial click-functional molecules are based on 1,2-benzisothiazolin-3-one (BIT), trimethylguanidine or tetramethylguanidine (TMG), polyhexamethylene guanidine (PHMG), fluorine-containing molecules, or a combination thereof. For example, 1,2-benzisothiazolin-3-one (BIT) functionalized with an alkyne (BIT-Al), trimethylguanidine or tetramethylguanidine (TMG) functioned with an alkyne (TMG-Al) or dual alkynes (TMG-dAl), and/or polyhexamethylene guanidine (PHMG) functionalized with an alkyne (PHMG-Al) are described herein. Clickable antimicrobial polymers can be used to form coatings or films.