(A) . Polylactic acid is a biodegradable polymer.It is a thermoplastic polyester.It is obtained by the condensation polymerization of lactic acid.The

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(A) . Polylactic acid is a biodegradable polymer.It is a thermoplastic polyester.It is obtained by the condensation polymerization of lactic acid.The reaction is as follows:$2CH_3CH(OH)COOH$ $\xrightarrow{-H_2O} \text{Lactide}$ $\xrightarrow{n} (-O-CH(CH_3)-CO-)_n$ (Polylactic acid).