polyDADMAC

PolyDADMAC, short for poly(diallyl dimethyl ammonium chloride), is a synthetic cationic polymer in the class of polyquaternary ammonium compounds. It consists of repeating units derived from the diallyl dimethylammonium chloride monomer and is typically produced by free radical polymerization. The resulting polymer is water-soluble and carries a high density of quaternary ammonium groups, with chloride as the common counterion. The polymer's molecular weight and degree of polymerization vary by grade.

Due to its cationic charge, polyDADMAC acts as a high-charge-density polyelectrolyte. It is relatively stable across a broad pH and temperature range, though its performance is influenced by ionic strength; high salinity can reduce flocculation efficiency.

In water treatment, polyDADMAC is used as a flocculant and coagulant aid. It neutralizes negatively charged particles and promotes aggregation, improving clarification, turbidity removal, and sludge dewatering. It is often applied with alum or ferric coagulants to enhance solids removal and filtration performance.

In the papermaking industry, polyDADMAC serves as a retention and drainage aid, helping to retain fines and fillers in the sheet and to improve paper quality and drainage.

Safety and environmental considerations: polyDADMAC is a regulated chemical; it can be an irritant upon contact and may pose ecological risks if released in high concentrations. It is not readily biodegradable, and standard handling and disposal precautions apply to minimize exposure and environmental impact.