Concept:
Polymers are classified mainly into two types based on the mechanism of polymerization:
• Addition polymers: formed by addition of monomers without elimination of small molecules.
• Condensation polymers: formed by the condensation of monomers with the elimination of small molecules such as water or HCl.
Step 1: Identify polymers formed by condensation reaction.
Condensation polymers are formed when two different monomers react and release small molecules like water.
Step 2: Formation of Nylon 6,6.
Nylon 6,6 is produced by the condensation reaction between:
\[
\text{Adipic acid} + \text{Hexamethylenediamine}
\]
During polymer formation, water molecules are eliminated.
Step 3: Conclusion.
Since Nylon 6,6 forms with the elimination of water molecules, it is a condensation polymer.