“…An immense number of antibacterial drugs have been developed, and the subsequent emergence of antimicrobial-resistant bacteria has since become a serious global issue. , With this in mind, novel antibacterial materials have attracted significant attention including low-molecular-weight peptides, , metal nanoparticles and nanocomposites, , and cationic polymers. − Antibacterial (or antimicrobial) materials are categorized as either release-killing agents or contact-killing agents. , More than 2000 research articles on antibacterial polymer nanoparticles have been published; typically, the polymers are conjugated with inorganic nanoparticles, such as Ag, Au, ZnO, Cu, and Fe. In addition, polymer nanoparticles are also used as a cargo for antibacterial drugs. , Therefore, a synergy effect can be achieved for antibacterial nanoparticles by utilizing cationic polymers. However, the antibacterial activity of polymers themselves has not been discussed sufficiently.…”