| 초록 |
Poly(lactic acid) (PLA) is a well known biodegradable polymer that has found a number of applications in industry in the form of plastics, fibers, etc. It is difficult to obtain high molecular weight PLA using the conventional, direct condensation reaction, due to the occurrence of a depolymerization reaction. The most industrially acceptable process for the fabrication of synthetic PLA reported so far is via lactide formation. The formation of optically pure lactide is regarded as one of the most important processes, since the optical purity of the lactide significantly affects the quality of the final product. In this study, the optically pure lactide was obtained from lactic acid via oligomeric poly(lactic acid). To improve the optical purity of the lactide, the effects of temperature, time, solvent, and the stirring velocity(RPM) on the lactide purification process were examined. The composition of resulting lactide was investigated by nuclear magnetic resonance(NMR). |
