Magnetically Cured Macroradical Epoxy as Antimicrobial Coating

Author:

Capricho Jaworski C.1ORCID,Liao Tzu‐Ying234ORCID,Chai Boon Xian1ORCID,Al‐Qatatsheh Ahmed1ORCID,Vongsvivut Jitraporn (Pimm)5ORCID,Kingshott Peter24ORCID,Juodkazis Saulius246ORCID,Fox Bronwyn Louise13ORCID,Hameed Nishar14ORCID

Affiliation:

1. School of Engineering Swinburne University of Technology Hawthorn Melbourne VIC 3122 Australia

2. School of Science and Computing Technologies Swinburne University of Technology Hawthorn Melbourne VIC 3122 Australia

3. CSIRO Clayton Melbourne VIC 3168 Australia

4. ARC Training Centre in Surface Engineering for Advanced Materials (SEAM) Swinburne University of Technology Hawthorn Melbourne VIC 3122 Australia

5. Infrared Microspectroscopy (IRM) Beamline ANSTO – Australian Synchrotron 800 Blackburn Road Clayton Melbourne VIC 3168 Australia

6. Optical Sciences Center Swinburne University of Technology Hawthorn Melbourne VIC 3122 Australia

Abstract

AbstractThe radical‐bearing epoxy monomer could be the ideal embodiment of multifunctionality in epoxy‐based materials. This study demonstrates the potential of macroradical epoxies as surface coating materials. A diepoxide monomer derivatized with a stable nitroxide radical is polymerized with a diamine hardener under the influence of a magnetic field. The magnetically oriented and stable radicals in the polymer backbone render the coatings antimicrobial. The unconventional use of magnets during polymerization proved crucial in correlating the structure‐property relationships with antimicrobial performance inferred from oscillatory rheological technique, polarized macro‐attenuated total reflectance – infrared (macro‐ATR‐IR) spectroscopy and X‐ray photoelectron spectroscopy (XPS). The magnetic thermal curing influenced the surface morphology, resulting in a synergy of the coating's radical nature with microbiostatic performance assessed using the Kirby‐Bauer test and liquid chromatography – mass spectroscopy (LC–MS). Further, the magnetic curing of blends with a traditional epoxy monomer demonstrates that radical alignment is more critical than radical density in imparting biocidal behavior. This study shows how the systematic use of magnets during polymerization could pave for probing more significant insights into the mechanism of antimicrobial action in radical‐bearing polymers.

Funder

Australian Research Council

Publisher

Wiley

Subject

General Chemistry,Biochemistry,Organic Chemistry

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