DADMAC and PolyDADMAC refer to diallyldimethylammonium chloride and its polymeric form, respectively. Here are the key differences:

1. Chemical Structure:

   DADMAC: It's a monomer with the formula C8H16NCl. It consists of two allyl groups attached to a central nitrogen atom, which is also connected to a methyl group and a chloride ion.

   PolyDADMAC: This is the polymerized form of DADMAC, where many DADMAC monomers are linked together in long chains. It is known for its high molecular weight and can vary in chain length depending on the polymerization process.

2. Usage:

   DADMAC: As a monomer, it's primarily used in the synthesis of polymers and copolymers. It's the building block for making PolyDADMAC and other polymers.

   PolyDADMAC: It is widely used in water treatment, papermaking, and various industries as a flocculant or coagulant due to its positive charge which helps in binding and removing impurities. It's also used in personal care products, drilling, and as a conditioning agent.

3. Properties:

   DADMAC: It's reactive and used in chemical synthesis.

   PolyDADMAC: It has properties like high charge density, stability, and is effective in clarifying water and various industrial applications.

In summary, DADMAC is the monomeric form used as a building block for polymers, while PolyDADMAC is the polymerized form with applications in water treatment, papermaking, and more due to its cationic nature and ability to form long chains with high molecular weight.