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- W2384284888 abstract "Sequential diblock copolymers composed of L-and DL-lactide, P(L-LA-B-DL-LA), were synthesized through a living ring-opening polymerization initiated by A1/Zn bimetallic alkoxidecomplex[(RO)4Al2O2Zn].Microspheres made with the block copolymers containing 20%wtnorgestimate (NGM)were prepared by a modified solvent-evaporation process. The effects of changingboth the composition and molecular weight of copolymers on the release rate of NGM were determinedin vitro.It was observed that the release profiles varied with the composition and molecular weight ofcopolymers.It is interesting to note that the release rate was greatly increased when the ratio of DL-LAto L-LA was 50/50 and the zero-order release could be obtained while L-LA segment in the blockcopolymer was 75%. The block copolymers were subjected to measurements of wide-angle X-ray diffraction anddifferential scanning calorimetry(DSC)analysis and the results revealed that the morphology of blockcopolymers was different from that of both homopolymers. which affected the release of drug and degra-dation of polymer." @default.
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- W2384284888 date "1994-01-01" @default.
- W2384284888 modified "2023-09-25" @default.
- W2384284888 title "Block copolymer of DL-and L-lactide/norgestimate microspheres:a new long-acting injectable biodegratable contraceptive" @default.
- W2384284888 hasPublicationYear "1994" @default.
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