Due to biodegradability, biocompatibility, as well as excellent shaping and molding properties, aliphatic polyesters such as polylactide (PLA), poly (e-caprolactone)(PCL), and their respective copolymers have been increasingly used in biomedical and engineering fields in recent years, including absorbable implant materials, biodegradable surgical sutures, vascular grafts, bone screws, and carriers in drug delivery.[1–6] Preparation of ...