Dicarboxylic acid monomers have two carboxylic acid groups (-COOH) that can undergo condensation reactions to form esters or amides. Monomers: Used in the synthesis of polyesters, polyamides and other polymers. They are important raw materials for the textile, packaging and automotive industries. Macromonomers: Can be polymerized to form polymers with specific properties, such as increased flexibility and strength. They are also used to produce biodegradable polymers.