Abstract: A new kind of water-soluble copolymers were prepared by ring-opening copolymerization of DL-lactide and 2-hydro-2-oxo-1,3,2-dioxaphosphorinane,using triisobutylaluminium as the initiator. The final copolymers were characterized by ¹HNMR,IR spectrometry.The influences of the amounts of initiator and molar ratio of the monomers on the total conversion,monomer conversion,copolymer composition,intrinsic viscosity of the copolymers were investigated,respectively.

Key words: DL-Lactide, 2-Hydro-2-oxo-1,3,2-dioxaphosphorinane, Ring-opening copolymerization