| 초록 |
Aliphatic polyesters with a narrow dispersity are useful for biomedical, pharmaceutical, and industrial applications such as biodegradable implant materials, drug delivery systems, and precursors for the synthesis of polyurethanes. On the other hand, polyesters with star and branched architectures are attractive candidates for viscosity modifiers and plasticizers. A series of polyesters have been synthesized via the ring-opening polymerization of lactones such as ε-caprolactone and rac-lactide in the presence of various bio-based initiators and a solid catalyst. Linear and star polylactones were obtained using ethylene glycol and sorbitol as initiators whereas hyperbranched polylactones were prepared using glycidol as an initiator and branching monomer. The resultant polyesters were characterized by nuclear magnetic resonance spectroscopy and gel permeation chromatography. Mechanism for the formation of various polyester architectures were proposed based on kinetic studies. |
