Benzenemethanaminium, ar-ethenyl-N,N,N-trimethyl-, chloride (1:1), homopolymer, commonly known as poly(vinylbenzyltrimethylammonium) chloride, is a versatile polymer featuring quaternary ammonium groups. This water-soluble polymer exhibits cationic character and finds applications in various fields, such as water treatment, biotechnology, and materials science, due to its unique properties and reactivity.