| 초록 |
Poly(D,L-lactic acid-co-L-lactic acid)-bl-Poly(ethylene glycol)-bl-poly(L-Lactic acid-co-D,L -lactic acid) (PLA-PEG-PLA) triblock copolymers were synthesized by ring opening polymerization of D,L-lactide and L-lactide onto Poly(ethylene glycol). Aqueous solutions of PLA-PEG-PLA triblock copolymers underwent from sol to gel phase transition with increasing temperature. In this research, the sol to gel transition behavior of aqueous solutions of the triblock copolymers was investigated as functions of molecular weight of triblocks, the hydrophobic/hydrophilic (PLA/PEG) balance, the ratio of DLLA to LLA in PLA.
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