(a) Immobilization of quaternary ammonium (QAS) or phosphonium salts (QPS) onto crosslinked copolymers, adapted with permission from [61]; (b) Antimicrobial poly(ɛ-caprolactone), adapted with permission from [62]; (c) Quaternized poly(VP-co-HEMA) and poly(VP-co-PEGMA), adapted with permission from [63]; (d) Two types of ionic dimethacrylate monomers containing QAS for preparing antimicrobial dental materials, adapted with permission from [64]; (e) Triethoxysilane terminated QAS, adapted with permission from [65]; (f) QPS functionalized alkyne-containing poly(butylene adipate), adapted with permission from [66].