BRAINCAKEPolyesters
A polyester is a condensation polymer in which the repeating units are joined by ester links, -COO-. It forms when the -COOH groups of a dicarboxylic acid react with the -OH groups of a diol, eliminating a molecule of water at each link.
The best-known example is Terylene (also called PET), made from benzene-1,4-dicarboxylic acid and ethane-1,2-diol:
n HOOC-C6H4-COOH + n HOCH2CH2OH → [-CO-C6H4-CO-O-CH2CH2-O-]n + (2n − 1) H2O
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All 8 lessons in Condensation Polymers · All AQA A-level Chemistry topics