Regenerability of antibacterial activity of interpenetrating polymeric N-halamine and poly(ethylene terephthalate)



Effective antibacterial modification of poly(ethylene terephthalate) (PET) was achieved by forming a surface thermoplastic semi-interpenetrating network of polyacrylamide (PAM) and PET, followed by converting the immobilized amides to N-halamine. The regenerability of N-halamine on PAM-modified PET was significantly influenced by the cross-linkers used to form the network. Through Fourier transform infrared spectroscopy and nitrogen content analysis of the materials for up to 29 regeneration cycles, it was found that breaking down of the PAM network in chlorination accounted for the loss of regenerability. The relationship between antibacterial efficacy and N-halamine concentration was also studied. Compared with N,N′-methylenebisacrylamide and 2-ethyleneglycol diacrylate, cross-linker divinylbenzene can generate more durable PAM network. After 29 regeneration cycles, the PAM-divinylbenzene network-modified PET was still able to provide 100% reduction of healthcare-associated methicillin-resistant Staphylococcus aureus in 20 min contact. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011