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Question:

Give one example of a condensation polymer.

Solution:

A condensation polymer is a polymer formed by a condensation reaction. In a condensation reaction, monomers join together by releasing a small molecule, such as water. Many examples exist, including:

  • Polyester: Formed from the reaction of a dicarboxylic acid and a dialcohol. The ester linkage (-COO-) forms between the monomers, and a water molecule is released in the process. Polyethylene terephthalate (PET), used in plastic bottles, is a common example.
  • Polyamide (Nylon): Formed from the reaction of a dicarboxylic acid and a diamine. The amide linkage (-CONH-) forms between the monomers, and a water molecule is released. Nylon 6,6 is a common example.
  • Polycarbonate: Formed from the reaction of a diphenol and a phosgene derivative. A carbonate linkage is formed, and a molecule of HCl is released.

Therefore, any of these (or others) could be considered a valid answer. For example, "Polyester" or "Nylon" would be acceptable answers.