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Polyurethane biocidal polymeric surface modifiers.

Umit Makal1, Lynn Wood, Dennis E Ohman

  • 1Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, VA 23284, USA.

Biomaterials
|September 27, 2005
PubMed
Summary
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New biocidal polymeric surface modifiers (PSMs) were developed for polyurethane coatings. These PSMs demonstrate rapid and effective killing of bacteria on surfaces, offering enhanced antimicrobial properties.

Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Surface Science

Background:

  • Polyurethanes (PUs) are versatile materials used in various applications.
  • Developing effective antimicrobial surfaces is crucial for preventing bacterial contamination.
  • Existing antimicrobial strategies may face challenges with durability and efficacy.

Purpose of the Study:

  • To synthesize and characterize novel polymeric surface modifiers (PSMs) for polyurethane coatings.
  • To evaluate the biocidal efficacy of PSM-modified polyurethane surfaces against common bacteria.
  • To optimize PSM concentration for maximum antimicrobial activity.

Main Methods:

  • Preparation of polyurethanes with semifluorinated and 5,5-dimethylhydantoin pendant groups.
  • Incorporation of PSMs into a conventional polyurethane coating.

Related Experiment Videos

  • Surface characterization using dynamic contact angle measurements.
  • Activation of PSM-modified surfaces via chloramide formation using hypochlorite.
  • Assessment of biocidal activity using a modified AATCC-100 test against Gram-positive and Gram-negative bacteria.

    • Main Results:

    • Surface enrichment of the PSM was confirmed.
    • Chloramide functionalization led to increased surface hydrophobicity.
    • PSM-modified polyurethanes exhibited significant biocidal activity against Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli.
    • Complete kill of P. aeruginosa was achieved in 15 minutes with as little as 1.6 wt% PSM.

    Conclusions:

    • Novel PSMs effectively impart antimicrobial properties to polyurethane coatings.
    • The chloramide-activated surfaces demonstrate rapid and potent biocidal action.
    • Optimized PSM concentrations can lead to highly efficient bacterial eradication, suggesting potential for advanced antimicrobial material applications.