| 摘要 |
Biodegradable, flowable or flexible polymer compositions are described comprising a polymer having the recurring monomeric units shown in formula I:wherein:each of R and R' is independently straight or branched alkylene, either unsubstituted or substituted with one or more non-interfering substituents;L is a divalent cycloaliphatic group;R'' is selected from the group consisting of H, alkyl, alkoxy, aryl, aryloxy, heterocyclic or heterocycloxy; andn is 5 to 1,000,wherein said biodegradable polymer is biocompatible before and upon biodegradation. In one embodiment, one or more of R, R' or R'' is a biologically active substance.Amorphous compositions containing a biologically active substance, in addition to the polymer, and methods for controllably releasing biologically active substances using the compositions, are also described. |
