| 摘要 |
The present invention concerns a block copolymer composed of two blocks S1 and S2, wherein S1 consists of m(PEG)n, where n is an integer in the range between 4 and 50 and S2 is a random copolymer consisting of the monomer units R1 and R2 where R1 is the monomer unit corresponding to the monomer γ- valerolactone and R2 is the monomer unit corresponding to the monomer selected from the group consisting of &egr;-caprolactone, δ-valerolactone, &bgr;-butyrolactone, &egr;-caprolactam, δ- valerolactam. A method for the preparation thereof, the use thereof, nanoparticles and a pharmaceutical composition comprising the same is also provided. |
