Tailoring Macromolecular Structure of Cationic Polymers towards Efficient Contact Active Antimicrobial Surfaces

Area of Science:

• Materials Science
• Polymer Chemistry
• Antimicrobial Technology

Background:

• Development of effective antimicrobial surfaces is crucial for preventing microbial contamination.
• Quaternary ammonium salts (QAS) are known biocides, but their immobilization on surfaces requires careful design.
• Polyacrylonitrile (PAN) serves as a matrix for creating functional antimicrobial films.

Purpose of the Study:

• To prepare contact-active antimicrobial films by blending copolymers with QAS and PAN.
• To investigate the influence of copolymer chemical and structural characteristics on antimicrobial activity.
• To evaluate the efficacy of these antimicrobial films against various microorganisms.

Main Methods:

• Synthesis of acrylonitrile-methacrylic copolymers with quaternizable groups.
• Preparation of blend films incorporating copolymers and QAS.
• Testing antimicrobial activity against *Staphylococcus aureus*, *Pseudomonas aeruginosa*, and *Candida parapsilosis*.
• Analysis of polymer flexibility, polarity, and charge density effects on antimicrobial performance.

Main Results:

• Antimicrobial film efficacy is significantly influenced by polymer flexibility and polarity.
• Surface-tethered active cationic groups require side-chain mobility for effective microbial contact.
• Blend films with high positive charge density and chain mobility achieved >99.999% killing efficiency.

Conclusions:

• Optimized copolymer structure and blend composition are key for highly effective contact-active antimicrobial surfaces.
• Surface-immobilized antimicrobial agents benefit from enhanced chain mobility for improved biocidal activity.
• These novel antimicrobial films show significant potential for applications requiring robust microbial control.