Abstract
AbstractBiodegradable polyesters obtained by fermentation of Alcaligenes eutrophus are characterized with the aid of H, D, C NMR spectroscopy. Copolymers of 3‐hydroxybutyrate and 3‐hydroxyvalerate are Bernoullian or mixture of two Bernoullian copolymers depending on fermentation conditions. The reverse reaction was found in the reaction catalyzed by beta‐ketothiolase during biosynthetic pathway. The fractional population of gauche and trans conformers around the skeletal CH‐CH2 bond is 0.6:0.4 for both poly(3‐hydroxybutyrate) and poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) in chloroform. This result suggests the possibility of formation of isomorphic crystals between copolymers with different composition ratios.
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