<P> In this classical method, an alcohol and a carboxylic acid react to form a carboxylic ester . To assemble a polymer, the water formed by the reaction must be continually removed by azeotrope distillation . </P> <P> The acid begins as an acid chloride, and thus the polycondensation proceeds with emission of hydrochloric acid (HCl) instead of water . This method can be carried out in solution or as an enamel . </P> <Dl> <Dd> Silyl method </Dd> <Dd> In this variant of the HCl method, the carboxylic acid chloride is converted with the trimethyl silyl ether of the alcohol component and production of trimethyl silyl chloride is obtained </Dd> </Dl> <Dd> In this variant of the HCl method, the carboxylic acid chloride is converted with the trimethyl silyl ether of the alcohol component and production of trimethyl silyl chloride is obtained </Dd>

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