Synthesis of Polylactic Acid-Polyethylene Glycol via Melt Copolymerization

In this study,Polylactic Acid-Polyethylene glycol(PLA-PEG) was synthesized via melt copolymerization.The influence of the type and the amount of catalyst,the reaction temperature,the reaction time,the type and the amount of PEG on molecular weights of products are discussed.The performances of products are analyzed.The results show that from lactic acid and 1% polyethylene glycol(PEG) [Mn =400] with 0.8% stannous tin as catalyst,under the condition of 170℃,for 10 h,one obtains Polylactic Acid-Polyethylene glycol(Mη=2.79×104),with improved hydrophilicity.