Miscibility and thermal behavior of blends of synthetic biodegradable aliphatic polyester (BDP) with poly(epichlorohydrin) (PECH) were investigated by both differential scanning calorimetry and a dynamic mechanical thermal analyzer. Single glass transition temperatures in agreement with the Fox equation indicate that these blend mixtures are miscible. This was further clarified from the cryogenically fractured surface of BDP-PECH blends by scanning electron microscopy.