Coagulation/flocculation is a widely used process for particle removal in water and wastewater treatment. Quaternary ammonium cationic polyacrylamide become the focuses of research at home and abroad at present as a new high-efficiency organic cationic flocculant. Synthetizing references, cationic copolymer acrylamide-dimethyldiallyl ammonium chloride (PDMDAAC-AM) was synthesized from acrylamide (AM) and dimethyldiallyl ammonium chloride (DMDAAC) by dispersion polymerization. The dispersion system was selec...