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poly(D,L-lactide-co-L-lactide) (PDLLA). The Monte Carlo model is set up according to the reactivity probabilities of two kinds of isomerRR and SS during ring-opening chain propagation. The simulation results for Tetrads and Hexads intensities are in good agreement withexperimental results for13C NMR. Some other important parameters for the stereochemical structure of PDLLA are also obtained fromRun numbers. The inuence of reactivity ratiorand feed ratiop on the stereochemical structure is analyzed and discussed in detail. Thiscomputer simulation method has proved to be a convenient method for establishing structureproperties relationships of certain poly-mers whose stereoregularity can be adjusted, such as PDLLA.