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Copolymer composition of a biodegradable aliphatic copolyester, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P(3HB-co-3HV)) with a wide range of 3HV contents (ca. 4–23mol%) was determined by pyrolysis-gas chromatography (Py-GC) in the presence of tetramethylammonium hydroxide (TMAH). Nine major peaks of methylated products, five of which were attributed to the products from 3HV unit and the other...