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Dacron is classified mechanistically as a step-growth polymer. What is the stable, low-molecular-weiPolymers Chemistry Question

Question

Dacron is classified mechanistically as a step-growth polymer. What is the stable, low-molecular-weight byproduct that is continuously eliminated during the repetitive esterification steps between ethylene glycol and terephthalic acid?

Answer: C

💡 Solution & Explanation

During the condensation polymerization to form polyesters like Dacron or Glyptal, the hydroxyl ($-OH$) group of the diol reacts with the carboxyl ($-COOH$) group of the diacid to form an ester linkage ($-COO-$), with the accompanying elimination of a water ($H_2O$) molecule.

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