Biocidal hydantoinylsiloxane polymers. IV. N-halamine siloxane-functionalized silica gel

• Published in: Journal of applied polymer science 2006-09, Vol.101 (5), p.3448-3454
• Main Authors: Liang, J., Owens, J. R., Huang, T. S., Worley, S. D.
• Format: Article
• Language: English
• Subjects: Applied sciences; biocidal applications of polymers; biocidal silica gel; biopolymers; Chemical modifications; Escherichia coli; Exact sciences and technology; Inorganic and organomineral polymers; N-halamine polymers; Physicochemistry of polymers; polysiloxanes; Staphylococcus aureus
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.24346

The monomer 5,5‐dimethyl‐3‐(3′‐triethoxysilylpropyl)hydantoin and its hydrolysis product polymer poly[3‐(5,5‐dimethylhydantoinylpropyl)hydroxysiloxane] were employed to functionalize the surfaces of silica gel particles in order to produce an adhered film that becomes biocidal upon chlorination with dilute sodium hypochlorite bleach. The biocidal efficacy of the functionalized silica gel was demonstrated in a cartridge filter experiment against the bacterial pathogens Staphylococcus aureus and Escherichia coli O157:H7. Complete 6 log inactivations of the two bacterial species were observed within 30 s of contact. Moreover, upon loss of biocidal activity due to depletion of bound chlorine, the coated silica gel particles could be recharged by further exposure to dilute bleach. Potential uses of the biocidal silica gel include disinfection and odor control in water treatment facilities and recirculating baths. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 3448–3454, 2006