Synthesis, characterization and biocidal properties of epoxy resins containing quaternary ammonium salts

Quaternary ammonium salts (QAS) were covalently-bound to epoxy resins of di fferent DP in two steps: addition of a N,N-dialkylaminoethanethiol followed by the quaternization of the tertiary amine by an alkylbromide. (C8H17Br t o C14H29Br). The products were characterized by H-1 NMR spectroscopy; The Q AS-containing oligomers were used as polyols to prepare polyurethane (PU) f ilms by reaction with a triisocyanate. The films show a good bactericidal a ctivity against Escherichia coli, which is preserved after 6 months of imme rsion in water.